Nissan Maxima Service and Repair Manual: DTC/circuit diagnosis

Nissan Maxima Service and Repair Manual / Engine / Engine control system / DTC/circuit diagnosis

Trouble diagnosis - specification value

Description The specification (SP) value indicates the tolerance of the value that is displayed in "SPEC" of "DATA MONITOR" mode of CONSULT during normal operation of the Engine Control System. When the value in "SPEC" in "DATA MONITOR" mode is NOT within the SP value, the Engine Control System may have one or more malfunctions. The SP value is used to detect malfunctions that may affect the Engine Control System, but will not illuminate the MIL.

Power supply and ground circuit

Diagnosis Procedure 1.CHECK GROUND CONNECTION-I Turn ignition switch OFF. Check ground connection E9. Refer to Ground Inspection 2.CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT-I Disconnect ECM harness connector. Check the continuity between ECM harness connector and ground. Also check harness for short to power. 3.DETECT MALFUNCTIONING PART Check the following. Harness connectors E11, F2 Harness for open or short between ECM and ground 4.CHECK ECM POWER SUPPLY CIRCUIT-I Reconnect ECM harness connector. Turn ignition switch OFF and then ON. Check the voltage between ECM harness connectors. 5.DETECT MALFUNCTIONING PART Check the following. IPDM E/R connector E18 10 A fuse (No.

U0101 can comm circuit

Description CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Many electronic control units are equipped onto a vehicle, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives data but selectively reads required data only.

U1001 can comm circuit

P0011, P0021 IVT control

DTC Logic DTC DETECTION LOGIC NOTE: If DTC P0011 or P0021 is displayed with DTC P0075, P0081, first perform the trouble diagnosis for DTC P0075, P0081. DTC CONFIRMATION PROCEDURE 1.PRECONDITIONING If DTC Confirmation Procedure has been previously conducted, always perform the following before conducting the next test. Turn ignition switch OFF and wait at least 10 seconds. Turn ignition switch ON. Turn ignition switch OFF and wait at least 10 seconds. TESTING CONDITION: Before performing the following procedure, confirm that battery voltage is between 10 V and 16 V at idle. 2.PERFORM DTC CONFIRMATION PROCEDURE-I With CONSULT Turn ignition switch ON and select "DATA MONITOR" mode with CONSULT.

P0014, P0024 EVT control

DTC Logic DTC DETECTION LOGIC NOTE: If DTC P0014 or P0024 is displayed with DTC P0078, P0084 first perform trouble diagnosis for DTC P0078, P0084. Refer to EC-180, "DTC Logic". If DTC P0014 or P0024 is displayed with DTC P1078, P1084 first perform trouble diagnosis for DTC P1078, P1084 DTC CONFIRMATION PROCEDURE 1.PRECONDITIONING If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test. Turn ignition switch OFF and wait at least 10 seconds. Turn ignition switch ON Turn ignition switch OFF and wait at least 10 seconds.

P0031, P0032, P0051, P0052 A/F sensor 1 heater

Description SYSTEM DESCRIPTION The ECM performs ON/OFF duty control of the A/F sensor 1 heater corresponding to the engine operating condition to keep the temperature of A/F sensor 1 element within the specified range. DTC Logic DTC DETECTION LOGIC DTC CONFIRMATION PROCEDURE 1.PRECONDITIONING If DTC Confirmation Procedure has been previously conducted, always perform the following before conducting the next test. Turn ignition switch OFF and wait at least 10 seconds. Turn ignition switch ON. Turn ignition switch OFF and wait at least 10 seconds. TESTING CONDITION: Before performing the following procedure, confirm that battery voltage is more than 11 V at idle. 2.

P0037, P0038, P0057, P0058 HO2S2 heater

Description SYSTEM DESCRIPTION The ECM performs ON/OFF control of the heated oxygen sensor 2 heater corresponding to the engine speed, amount of intake air and engine coolant temperature. OPERATION DTC Logic DTC DETECTION LOGIC DTC CONFIRMATION PROCEDURE 1.PRECONDITIONING If DTC Confirmation Procedure has been previously conducted, always perform the following before conducting the next test. Turn ignition switch OFF and wait at least 10 seconds. Turn ignition switch ON. Turn ignition switch OFF and wait at least 10 seconds. TESTING CONDITION: Before performing the following procedure, confirm that battery voltage is between 11 V at idle. 2.

P0075, P0081 IVT control solenoid valve

Description Intake valve timing control solenoid valve is activated by ON/OFF pulse duty (ratio) signals from the ECM. The intake valve timing control solenoid valve changes the oil amount and direction of flow via the intake valve timing control unit or stops oil flow. The longer pulse width advances valve angle. The shorter pulse width retards valve angle. When ON and OFF pulse widths become equal, the solenoid valve stops oil pressure flow to fix the intake valve angle at the control position. DTC Logic DTC DETECTION LOGIC DTC CONFIRMATION PROCEDURE 1.PRECONDITIONING If DTC Confirmation Procedure has been previously conducted, always perform the following before conducting the next test.

P0078, P0084 EVT control magnet retarder

Description Exhaust valve timing control magnet retarder (1) controls the shut/ open timing of the exhaust valve by ON/OFF pulse duty signals sent from the ECM. The longer pulse width retards valve timing. The shorter pulse width advances valve timing. DTC Logic DTC DETECTION LOGIC DTC CONFIRMATION PROCEDURE 1.PRECONDITIONING If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test. Turn ignition switch OFF and wait at least 10 seconds. Turn ignition switch ON. Turn ignition switch OFF and wait at least 10 seconds. 2.PERFORM DTC CONFIRMATION PROCEDURE Start engine and let it idle for 5 seconds. Check 1st trip DTC.

P0101 MAF sensor

Description The mass air flow sensor (1) is placed in the stream of intake air. It measures the intake flow rate by measuring a part of the entire intake flow. The mass air flow sensor controls the temperature of the hot wire to a certain amount. The heat generated by the hot wire is reduced as the intake air flows around it. The greater air flow, the greater the heat loss. Therefore, the electric current supplied to hot wire is changed to maintain the temperature of the hot wire as air flow increases. The ECM detects the air flow by means of this current change.

P0102, P0103 MAF sensor

P0111 IAT sensor

Description The intake air temperature sensor is built-into the mass air flow sensor (1). The sensor detects intake air temperature and transmits a signal to the ECM. The temperature sensing unit uses a thermistor which is sensitive to the change in temperature. Electrical resistance of the thermistor decreases in response to the rise in temperature. <Reference data> *: These data are reference values and are measured between ECM terminals 50 (Intake air temperature sensor) and 56 (Sensor ground). DTC Logic DTC DETECTION LOGIC DTC CONFIRMATION PROCEDURE 1.INSPECTION START 2.PERFORM COMPONENT FUNCTION CHECK Perform component function check.

P0112, P0113 IAT sensor

P0116 ECT sensor

Description The engine coolant temperature sensor is used to detect the engine coolant temperature. The sensor modifies a voltage signal from the ECM. The modified signal returns to the ECM as the engine coolant temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases. <Reference data> *: These data are reference values and are measured between ECM terminals 46 (Engine coolant temperature sensor) and 52 (Sensor ground). DTC Logic DTC DETECTION LOGIC DTC CONFIRMATION PROCEDURE 1.INSPECTION START 2.PERFORM COMPONENT FUNCTION CHECK Perform component function check.

P0117, P0118 ECT sensor

P0122, P0123 TP sensor

Description Electric throttle control actuator consists of throttle control motor, throttle position sensor, etc. The throttle position sensor responds to the throttle valve movement. The throttle position sensor has two sensors. These sensors are a kind of potentiometer which transform the throttle valve position into output voltage, and emit the voltage signal to the ECM. The ECM judges the current opening angle of the throttle valve from these signals and controls the throttle valve opening angle in response to driving conditions via the throttle control motor.

P0125 ECT sensor

Description The engine coolant temperature sensor is used to detect the engine coolant temperature. The sensor modifies a voltage signal from the ECM. The modified signal returns to the ECM as the engine coolant temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases. <Reference data> *: These data are reference values and are measured between ECM terminals 46 (Engine coolant temperature sensor) and 52 (Sensor ground). DTC Logic DTC DETECTION LOGIC NOTE: If DTC P0125 is displayed with P0116, first perform the trouble diagnosis for DTC P0116.

P0127 IAT sensor

P0128 thermostat function

DTC Logic DTC DETECTION LOGIC NOTE: If DTC P0128 is displayed with DTC P0300, P0301, P0302, P0303, P0304, P0305 or P0306, first perform the trouble diagnosis for DTC P0300, P0301, P0302, P0303, P0304, P0305, P0306. Engine coolant temperature has not risen enough to open the thermostat even though the engine has run long enough. This is due to a leakage in the seal or the thermostat being stuck open. DTC CONFIRMATION PROCEDURE NOTE: Never refuel before and during the following procedure. 1.PRECONDITIONING-I If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test. Turn ignition switch OFF and wait at least 10 seconds.

P0130, P0150 A/F sensor 1

Description The air fuel ratio (A/F) sensor 1 is a planar one-cell limit current sensor. The sensor element of the A/F sensor 1 is composed an electrode layer, which transports ions. It has a heater in the element. The sensor is capable of precise measurement = 1, but also in the lean and rich range. Together with its control electronics, the sensor outputs a clear, continuous signal throughout a wide range. The exhaust gas components diffuse via the diffusion layer at the sensor cell. An electrode layer is applied voltage, and this current relative oxygen density in lean. Also this current relative hydrocarbon density in rich.

P0131, P0151 A/F sensor 1

P0132, P0152 A/F sensor 1

P0137, P0157 HO2S2

Description The heated oxygen sensor 2, after three way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. Even if switching characteristics of the air fuel ratio (A/F) sensor 1 are shifted, the air-fuel ratio is controlled to stoichiometric, by the signal from the heated oxygen sensor 2. This sensor is made of ceramic zirconia. The zirconia generates voltage from approximately 1 V in richer conditions to 0 V in leaner conditions. Under normal conditions the heated oxygen sensor 2 is not used for engine control operation.

P0138, P0158 HO2S2

P0139, P0159 HO2S2

P014C, P014D, P014E, P014F, P015A, P015B, P015C, P015D A/F sensor 1

P0171, P0174 fuel injection system function

DTC Logic DTC DETECTION LOGIC With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the theoretical mixture ratio based on the mixture ratio feedback signal from A/F sensor 1. The ECM calculates the necessary compensation to correct the offset between the actual and the theoretical ratios. In case the amount of the compensation value is extremely large (the actual mixture ratio is too lean), the ECM judges the condition as the fuel injection system malfunction and illuminates the MIL (2 trip detection logic). DTC CONFIRMATION PROCEDURE 1.

P0172, P0175 fuel injection system function

DTC Logic DTC DETECTION LOGIC With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the theoretical mixture ratio based on the mixture ratio feedback signal from A/F sensor 1. The ECM calculates the necessary compensation to correct the offset between the actual and the theoretical ratios. In case the amount of the compensation value is extremely large (the actual mixture ratio is too rich), the ECM judges the condition as the fuel injection system malfunction and illuminates the MIL (2 trip detection logic). DTC CONFIRMATION PROCEDURE 1.

P0181 FTT sensor

Description The fuel tank temperature sensor is used to detect the fuel temperature inside the fuel tank. The sensor modifies a voltage signal from the ECM. The modified signal returns to the ECM as the fuel temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases. <Reference data> *: These data are reference values and are measured between ECM terminals 95 (Fuel tank temperature sensor) and 104 (sensor ground). DTC Logic DTC DETECTION LOGIC DTC CONFIRMATION PROCEDURE 1.INSPECTION START 2.

P0182, P0183 FTT sensor

P0196 EOT sensor

Description The engine oil temperature sensor is used to detect the engine oil temperature. The sensor modifies a voltage signal from the ECM. The modified signal returns to the ECM as the engine oil temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases. <Reference data> *: These data are reference values and are measured between ECM terminals 54 (Engine oil temperature sensor) and 52 (Sensor ground). DTC Logic DTC DETECTION LOGIC NOTE: If DTC P0196 is displayed with DTC P0197 or P0198, first perform the trouble diagnosis for DTC P0197 or P0198.

P0197, P0198 EOT sensor

P0222, P0223 TP sensor

P0300, P0301, P0302, P0303, P0304, P0305, P0306 misfire

DTC Logic DTC DETECTION LOGIC When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the crankshaft position (CKP) sensor (POS) signal to vary, ECM can determine that a misfire is occurring. The misfire detection logic consists of the following two conditions. One Trip Detection Logic (Three Way Catalyst Damage) On the 1st trip, when a misfire condition occurs that can damage the three way catalyst (TWC) due to overheating, the MIL will blink. When a misfire condition occurs, the ECM monitors the CKP sensor signal every 200 engine revolutions for a change.

P0327, P0328, P0332, P0333 KS

Description The knock sensor is attached to the cylinder block. It senses engine knocking using a piezoelectric element. A knocking vibration from the cylinder block is sensed as vibrational pressure. This pressure is converted into a voltage signal and sent to the ECM. DTC Logic DTC DETECTION LOGIC DTC CONFIRMATION PROCEDURE 1.PRECONDITIONING If DTC Confirmation Procedure has been previously conducted, always perform the following before conducting the next test. Turn ignition switch OFF and wait at least 10 seconds. Turn ignition switch ON. Turn ignition switch OFF and wait at least 10 seconds.

P0335 CKP sensor (POS)

Description The crankshaft position sensor (POS) is located on the oil pan facing the gear teeth (cogs) of the signal plate. It detects the fluctuation of the engine revolution. The sensor consists of a permanent magnet and Hall IC. When the engine is running, the high and low parts of the teeth cause the gap with the sensor to change. The changing gap causes the magnetic field near the sensor to change. Due to the changing magnetic field, the voltage from the sensor changes. The ECM receives the voltage signal and detects the fluctuation of the engine revolution. ECM receives the signals as shown in the figure. DTC Logic DTC DETECTION LOGIC DTC CONFIRMATION PROCEDURE 1.

P0340, P0345 CMP sensor (PHASE)

Description The camshaft position sensor (PHASE) senses the retraction of camshaft (INT) to identify a particular cylinder. The camshaft position sensor (PHASE) senses the piston position. When the crankshaft position sensor (POS) system becomes inoperative, the camshaft position sensor (PHASE) provides various controls of engine parts instead, utilizing timing of cylinder identification signals. The sensor consists of a permanent magnet and Hall IC. When engine is running, the high and low parts of the teeth cause the gap with the sensor to change. The changing gap causes the magnetic field near the sensor to change. Due to the changing magnetic field, the voltage from the sensor changes.

P0420, P0430 three way catalyst function

DTC Logic DTC DETECTION LOGIC The ECM monitors the switching frequency ratio of air fuel ratio (A/F) sensor 1 and heated oxygen sensor 2. A three way catalyst (manifold) with high oxygen storage capacity will indicate a low switching frequency of heated oxygen sensor 2. As oxygen storage capacity decreases, the heated oxygen sensor 2 switching frequency will increase. When the frequency ratio of A/F sensor 1 and heated oxygen sensor 2 approaches a specified limit value, the three way catalyst (manifold) malfunction is diagnosed. DTC CONFIRMATION PROCEDURE 1.INSPECTION START 2.

P0441 evap control system

DTC Logic DTC DETECTION LOGIC NOTE: If DTC P0441 is displayed with other DTC such as P2122, P2123, P2127, P2128 or P2138, first perform trouble diagnosis for other DTC. In this evaporative emission (EVAP) control system, purge flow occurs during non-closed throttle conditions. Purge volume is related to air intake volume. Under normal purge conditions (non-closed throttle), the EVAP canister purge volume control solenoid valve is open to admit purge flow. Purge flow exposes the EVAP control system pressure sensor to intake manifold vacuum. Under normal conditions (non-closed throttle), sensor output voltage indicates if pressure drop and purge flow are adequate.

P0442 evap control system

DTC Logic DTC DETECTION LOGIC This diagnosis detects leakage in the EVAP purge line using engine intake manifold vacuum. If pressure does not increase, the ECM will check for leakage in the line between the fuel tank and EVAP canister purge volume control solenoid valve, under the following "Vacuum test" conditions. The EVAP canister vent control valve is closed to shut the EVAP purge line off. The EVAP canister purge volume control solenoid valve will then be opened to depressurize the EVAP purge line using intake manifold vacuum. After this occurs, the EVAP canister purge volume control solenoid valve will be closed.

P0443 evap canister purge volume control solenoid valve

Description The EVAP canister purge volume control solenoid valve is used to control the flow rate of fuel vapor from the EVAP canister. The EVAP canister purge volume control solenoid valve is moved by ON/OFF pulses from the ECM. The longer the ON pulse, the greater the amount of fuel vapor that will flow via the valve. DTC Logic DTC DETECTION LOGIC DTC CONFIRMATION PROCEDURE 1.PRECONDITIONING If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test. TESTING CONDITION: Perform DTC CONFIRMATION PROCEDURE when the fuel is between 1/4 and 3/4 full, and vehicle is placed on flat level surface.

P0444, P0445 evap canister purge volume control solenoid valve

Description The EVAP canister purge volume control solenoid valve is used to control the flow rate of fuel vapor from the EVAP canister. The EVAP canister purge volume control solenoid valve is moved by ON/OFF pulses from the ECM. The longer the ON pulse, the greater the amount of fuel vapor that will flow via the valve. DTC Logic DTC DETECTION LOGIC DTC CONFIRMATION PROCEDURE 1.CONDITIONING If DTC Confirmation Procedure has been previously conducted, always perform the following before conducting the next test. Turn ignition switch OFF and wait at least 10 seconds. Turn ignition switch ON. Turn ignition switch OFF and wait at least 10 seconds.

P0447 evap canister vent control valve

Description The EVAP canister vent control valve is located on the EVAP canister and is used to seal the canister vent. This solenoid valve responds to signals from the ECM. When the ECM sends an ON signal, the coil in the solenoid valve is energized. A plunger will then move to seal the canister vent. The ability to seal the vent is necessary for the on board diagnosis of other evaporative emission control system components. This solenoid valve is used only for diagnosis, and usually remains opened. When the vent is closed, under normal purge conditions, the evaporative emission control system is depressurized and allows "EVAP Control System" diagnosis.

P0448 evap canister vent control valve

P0451 evap control system pressure sensor

Description The EVAP control system pressure sensor detects pressure in the purge line. The sensor output voltage to the ECM increases as pressure increases DTC Logic DTC DETECTION LOGIC DTC CONFIRMATION PROCEDURE NOTE: Never remove fuel filler cap during DTC confirmation procedure. 1.PRECONDITIONING If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test. Turn ignition switch OFF and wait at least 10 seconds. Turn ignition switch ON. Turn ignition switch OFF and wait at least 10 seconds. 2.PERFORM DTC CONFIRMATION PROCEDURE-1 With CONSULT Start engine and let it idle for least 40 seconds.

P0452 evap control system pressure sensor

Description The EVAP control system pressure sensor detects pressure in the purge line. The sensor output voltage to the ECM increases as pressure increases. DTC Logic DTC DETECTION LOGIC DTC CONFIRMATION PROCEDURE 1.PRECONDITIONING If DTC Confirmation Procedure has been previously conducted, always perform the following before conducting the next test. Turn ignition switch OFF and wait at least 10 seconds. Turn ignition switch ON. Turn ignition switch OFF and wait at least 10 seconds. TESTING CONDITION: Always perform test at a temperature of 5C (41F) or more. 2.PERFORM DTC CONFIRMATION PROCEDURE With CONSULT Start engine and warm it up to normal operating temperature.

P0453 evap control system pressure sensor

P0455 evap control system

DTC Logic DTC DETECTION LOGIC This diagnosis detects a very large leakage (fuel filler cap fell off etc.) in EVAP system between the fuel tank and EVAP canister purge volume control solenoid valve. CAUTION: Use only a genuine NISSAN fuel filler cap as a replacement. If an incorrect fuel filler cap is used, the MIL may illuminate. If the fuel filler cap is not tightened properly, the MIL may illuminate. Use only a genuine NISSAN rubber tube as a replacement. DTC CONFIRMATION PROCEDURE 1.PRECONDITIONING CAUTION: Never remove fuel filler cap during the DTC Confirmation Procedure.

P0456 evap control system

DTC Logic DTC DETECTION LOGIC NOTE: If DTC P0456 is displayed with DTC P0442, first perform the trouble diagnosis for DTC P0456. This diagnosis detects very small leakage in the EVAP line between fuel tank and EVAP canister purge volume control solenoid valve, using the intake manifold vacuum in the same way as conventional EVAP small leakage diagnosis. If ECM judges a leakage which corresponds to a very small leakage, the very small leakage P0456 will be detected. If ECM judges a leakage equivalent to a small leakage, EVAP small leakage P0442 will be detected. If ECM judges that there are no leakage, the diagnosis will be OK.

P0460 fuel level sensor

Description The fuel level sensor is mounted in the fuel level sensor unit. The sensor detects a fuel level in the fuel tank and transmits a signal to the combination meter. The combination meter sends the fuel level sensor signal to the ECM via the CAN communication line. It consists of two parts, one is mechanical float and the other is variable resistor. Fuel level sensor output voltage changes depending on the movement of the fuel mechanical float. DTC Logic DTC DETECTION LOGIC NOTE: If DTC P0460 is displayed with DTC UXXXX, first perform the trouble diagnosis for DTC UXXXX. Refer to EC-161, "DTC Logic".

P0461 fuel level sensor

Description The fuel level sensor is mounted in the fuel level sensor unit. The sensor detects a fuel level in the fuel tank and transmits a signal to the combination meter. The combination meter sends the fuel level sensor signal to the ECM via the CAN communication line. It consists of two parts, one is mechanical float and the other is variable resistor. Fuel level sensor output voltage changes depending on the movement of the fuel mechanical float. DTC Logic DTC DETECTION LOGIC NOTE: If DTC P0461 is displayed with DTC UXXXX, first perform the trouble diagnosis for DTC UXXXX. Refer to EC-161, "DTC Logic".

P0462, P0463 fuel level sensor

Description The fuel level sensor is mounted in the fuel level sensor unit. The sensor detects a fuel level in the fuel tank and transmits a signal to the combination meter. The combination meter sends the fuel level sensor signal to the ECM via the CAN communication line. It consists of two parts, one is mechanical float and the other is variable resistor. Fuel level sensor output voltage changes depending on the movement of the fuel mechanical float. DTC Logic DTC DETECTION LOGIC NOTE: If DTC P0462 or P0463 is displayed with DTC UXXXX, first perform the trouble diagnosis for DTC UXXXX.Refer to EC-161, "DTC Logic".

P0500 VSS

Description ECM receives vehicle speed signals from two different paths via CAN communication line: One is from the ABS actuator and electric unit (control unit) via the combination unit and the other is from TCM. DTC Logic DTC DETECTION LOGIC NOTE: If DTC P0500 is displayed with DTC UXXXX, first perform the trouble diagnosis for DTC UXXXX. If DTC P0500 is displayed with DTC P0607, first perform the trouble diagnosis for DTC P0607. DTC CONFIRMATION PROCEDURE 1.PRECONDITIONING If DTC CONFIRMATION PROCEDURE has been previously conducted, always perform the following procedure before conducting the next test. Turn ignition switch OFF and wait at least 10 seconds.

P0506 ISC system

Description The ECM controls the engine idle speed to a specified level via the fine adjustment of the air, which is let into the intake manifold, by operating the electric throttle control actuator. The operating of the throttle valve is varied to allow for optimum control of the engine idling speed. The crankshaft position sensor (POS) detects the actual engine speed and sends a signal to the ECM. The ECM controls the electric throttle control actuator so that the engine speed coincides with the target value memorized in the ECM. The target engine speed is the lowest speed at which the engine can operate steadily.

P0507 ISC system

P050A, P050e cold start control

Description ECM controls ignition timing and engine idle speed when engine is started with pre-warming up condition. This control promotes the activation of three way catalyst by heating the catalyst and reduces emissions. DTC Logic DTC DETECTION LOGIC NOTE: If DTC P050A or P050E is displayed with other DTC, first perform the trouble diagnosis for other DTC DTC CONFIRMATION PROCEDURE 1.PRECONDITIONING If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test. Turn ignition switch OFF and wait at least 10 seconds. Turn ignition switch ON. Turn ignition switch OFF and wait at least 10 seconds.

P0550 PSP sensor

Description Power steering pressure (PSP) sensor is installed to the power steering high-pressure tube and detects a power steering load. This sensor is a potentiometer which transforms the power steering load into output voltage, and emits the voltage signal to the ECM. The ECM controls the electric throttle control actuator and adjusts the throttle valve opening angle to increase the engine speed and adjusts the idle speed for the increased load. DTC Logic DTC DETECTION LOGIC NOTE: If DTC P0550 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to EC-394, "DTC Logic". DTC CONFIRMATION PROCEDURE 1.

P0603 ECM power supply

Description Battery voltage is supplied to the ECM even when the ignition switch is turned OFF for the ECM memory function of the DTC memory, the air-fuel ratio feedback compensation value memory, the idle air volume learning value memory, etc. DTC Logic DTC DETECTION LOGIC DTC CONFIRMATION PROCEDURE 1.PRECONDITIONING If DTC Confirmation Procedure has been previously conducted, always perform the following before conducting the next test. Turn ignition switch OFF and wait at least 10 seconds. Turn ignition switch ON. Turn ignition switch OFF and wait at least 10 seconds. 2.PERFORM DTC CONFIRMATION PROCEDURE Turn ignition switch ON and wait at least 10 second.

P0605 ECM

Description The ECM consists of a microcomputer and connectors for signal input and output and for power supply. The ECM controls the engine DTC Logic DTC DETECTION LOGIC DTC CONFIRMATION PROCEDURE 1.PRECONDITIONING If DTC Confirmation Procedure has been previously conducted, always perform the following before conducting the next test. Turn ignition switch OFF and wait at least 10 seconds. Turn ignition switch ON. Turn ignition switch OFF and wait at least 10 seconds. 2.PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION A Turn ignition switch ON. Check 1st trip DTC. 3.PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B Turn ignition switch ON and wait at least 1 second.

P0607 ECM

P0643 sensor power supply

DTC Logic DTC DETECTION LOGIC DTC CONFIRMATION PROCEDURE 1.PRECONDITIONING If DTC Confirmation Procedure has been previously conducted, always perform the following before conducting the next test. Turn ignition switch OFF and wait at least 10 seconds. Turn ignition switch ON. Turn ignition switch OFF and wait at least 10 seconds. TESTING CONDITION: Before performing the following procedure, confirm that battery voltage is more than 8 V at idle 2.PERFORM DTC CONFIRMATION PROCEDURE Turn ignition switch ON. Start engine and let it idle for 1 second. Check DTC Diagnosis Procedure 1.CHECK GROUND CONNECTION Turn ignition switch OFF. Check ground connection E9. 2.

P0850 PNP switch

Description When the selector lever position is P or N, park/neutral position (PNP) signal from the TCM is sent to ECM. DTC Logic DTC DETECTION LOGIC DTC CONFIRMATION PROCEDURE 1.INSPECTION START 2.PRECONDITIONING If DTC Confirmation Procedure has been previously conducted, always perform the following before conducting the next test. Turn ignition switch OFF and wait at least 10 seconds. Turn ignition switch ON. Turn ignition switch OFF and wait at least 10 seconds. 3.CHECK PNP SIGNAL With CONSULT Turn ignition switch ON. Select "P/N POSI SW" in "DATA MONITOR" mode with CONSULT. Then check the "P/N POSI SW" signal under the following conditions 4.

P1078, P1084 EVT control position sensor

Description Exhaust valve timing control position sensor detects the concave groove of the exhaust camshaft rear end. This sensor signal is used for sensing a position of the exhaust camshaft. This sensor uses a Hall IC. Based on the position of the exhaust camshaft, ECM controls exhaust valve timing control magnet retarder to optimize the shut/ open timing of exhaust valve for the driving condition. DTC Logic DTC DETECTION LOGIC NOTE: If DTC P1078 or P1084 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to EC-394, "DTC Logic". DTC CONFIRMATION PROCEDURE 1.

P1148, P1168 closed loop control

DTC Logic DTC DETECTION LOGIC NOTE: DTC P1148 or P1168 is displayed with another DTC for A/F sensor 1. Perform the trouble diagnosis for the corresponding DTC.

P1211 TCS control unit

Description The malfunction information related to TCS is transferred via the CAN communication line from "ABS actuator and electric unit (control unit)" to ECM. Be sure to erase the malfunction information such as DTC not only for "ABS actuator and electric unit (control unit)" but also for ECM after TCS related repair. DTC Logic DTC DETECTION LOGIC Freeze frame data is not stored in the ECM for this self-diagnosis. DTC CONFIRMATION PROCEDURE 1.PRECONDITIONING TESTING CONDITION: Before performing the following procedure, confirm that battery voltage is more than 10.5 V at idle. 2.PERFORM DTC CONFIRMATION PROCEDURE Start engine and let it idle for at least 60 seconds. Check 1st trip DTC.

P1212 TCS communication line

Description This CAN communication line is used to control the smooth engine operation during the TCS operation. Pulse signals are exchanged between ECM and "ABS actuator and electric unit (control unit)". Be sure to erase the malfunction information such as DTC not only for "ABS actuator and electric unit (control unit)" but also for ECM after TCS related repair. DTC Logic DTC DETECTION LOGIC NOTE: If DTC P1212 is displayed with DTC UXXXX, first perform the trouble diagnosis for DTC UXXXX. Refer to EC-161, "DTC Logic". If DTC P1212 is displayed with DTC P0607, first perform the trouble diagnosis for DTC P0607. Refer to EC-393, "DTC Logic".

P1217 engine over temperature

DTC Logic DTC DETECTION LOGIC NOTE: If DTC P1217 is displayed with DTC UXXXX, first perform the trouble diagnosis for DTC UXXXX. Refer to EC-161, "DTC Logic". If DTC P1217 is displayed with DTC P0607, first perform the trouble diagnosis for DTC P0607. Refer to EC-393, "DTC Logic". If the cooling fan or another component in the cooling system malfunctions, engine coolant temperature will rise. When the engine coolant temperature reaches an abnormally high temperature condition, a malfunction is indicated. CAUTION: When a malfunction is indicated, always replace the coolant. Refer to CO-10, "System Inspection". Also, replace the engine oil.

P1225 TP sensor

P1226 TP sensor

P1550 battery current sensor

Description The power generation voltage variable control enables fuel consumption to be decreased by reducing the engine load which is caused by the power generation of the generator. The battery current sensor is installed to the battery cable at the negative terminal. The sensor measures the charging/discharging current of the battery. Based on the sensor signal, ECM judges whether or not the power generation voltage variable control is performed. When performing the power generation voltage variable control, ECM calculates the target power generation voltage based on the sensor signal. And ECM sends the calculated value as the power generation command value to IPDM E/R.

P1551, P1552 battery current sensor

P1553 battery current sensor

P1554 battery current sensor

P1564 ASCD steering switch

Description ASCD steering switch has variant values of electrical resistance for each button. ECM reads voltage variation of switch, and determines which button is operated. Refer to EC-68, "System Diagram" for the ASCD function. DTC Logic DTC DETECTION LOGIC NOTE: If DTC P1564 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer to EC-391, "DTC Logic". DTC CONFIRMATION PROCEDURE 1.PRECONDITIONING If DTC Confirmation Procedure has been previously conducted, always perform the following before conducting the next test. Turn ignition switch OFF and wait at least 10 seconds. Turn ignition switch ON.

P1572 ASCD brake switch

Description When the brake pedal is depressed, ASCD brake switch is turned OFF and stop lamp switch is turned ON. ECM detects the state of the brake pedal by those two types of input (ON/OFF signal). Refer to EC-68, "System Diagram" for the ASCD function. DTC Logic DTC DETECTION LOGIC NOTE: If DTC P1572 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer to EC-391, "DTC Logic". This self-diagnosis has the one trip detection logic. When malfunction A is detected, DTC is not stored in ECM memory. And in that case, 1st trip DTC and 1st trip freeze frame data are displayed.

P1574 ASCD vehicle speed sensor

Description The ECM receives two vehicle speed signals via the CAN communication line. One is sent from combination meter, and the other is from TCM (Transmission control module). The ECM uses these signals for ASCD control. Refer to EC-68, "System Diagram" for ASCD functions. DTC Logic DTC DETECTION LOGIC NOTE: If DTC P1574 is displayed with DTC UXXXX, first perform the trouble diagnosis for DTC UXXXX. If DTC P1574 is displayed with DTC P0500, first perform the trouble diagnosis for DTC P0500. Refer to EC-378, "DTC Logic". If DTC P1574 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer to EC-391, "DTC Logic".

P1715 input speed sensor

Description ECM receives input speed sensor signal from TCM via the CAN communication line. ECM uses this signal for engine control. DTC Logic DTC DETECTION LOGIC NOTE: If DTC P1715 is displayed with DTC UXXXX first perform the trouble diagnosis for DTC UXXXX. Refer to EC-161, "DTC Logic". If DTC P1715 is displayed with DTC P0335, first perform the trouble diagnosis for DTC P0335. Refer to EC-296, "DTC Logic". If DTC P1715 is displayed with DTC P0340, P0345, first perform the trouble diagnosis for DTC P0340, P0345. Refer to EC-300, "DTC Logic". If DTC P1715 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605.

P1720 VSS

Description ECM receives two vehicle speed signals via the CAN communication line. One is sent from "ABS actuator and electric unit (control unit)" via the combination meter, and the other is from TCM (Transmission control module). ECM uses these signals for engine control. DTC Logic DTC DETECTION LOGIC NOTE: If DTC P1720 is displayed with DTC UXXXX first perform the trouble diagnosis for DTC UXXXX. Refer to EC-161, "DTC Logic". If DTC P1720 is displayed with DTC P0607, first perform the trouble diagnosis for DTC P0607. Refer to EC-393, "DTC Logic". DTC CONFIRMATION PROCEDURE 1.

P1800 vias control solenoid valve 1

Description The VIAS control solenoid valve 1 cuts the intake manifold vacuum signal for power valve 1 control. It responds to ON/OFF signals from the ECM. When the solenoid is OFF, the vacuum signal from the intake manifold is cut. When the ECM sends an ON signal the coil pulls the plunger downward and sends the vacuum signal to the power valve actuator 1. DTC Logic DTC DETECTION LOGIC DTC CONFIRMATION PROCEDURE 1.CONDITIONING If DTC Confirmation Procedure has been previously conducted, always perform the following before conducting the next test. Turn ignition switch OFF and wait at least 10 seconds. Turn ignition switch ON. Turn ignition switch OFF and wait at least 10 seconds.

P1801 vias control solenoid valve 2

Description The VIAS control solenoid valve 2 cuts the intake manifold vacuum signal for power valve 2 control. It responds to ON/OFF signals from the ECM. When the solenoid is OFF, the vacuum signal from the intake manifold is cut. When the ECM sends an ON signal the coil pulls the plunger downward and sends the vacuum signal to the power valve actuator 2. DTC Logic DTC DETECTION LOGIC DTC CONFIRMATION PROCEDURE 1.CONDITIONING If DTC Confirmation Procedure has been previously conducted, always perform the following before conducting the next test. Turn ignition switch OFF and wait at least 10 seconds. Turn ignition switch ON. Turn ignition switch OFF and wait at least 10 seconds.

P1805 brake switch

Description Brake switch signal is applied to the ECM via the stop lamp switch when the brake pedal is depressed. This signal is used mainly to decrease the engine speed when the vehicle is being driver. DTC Logic DTC DETECTION LOGIC DTC CONFIRMATION PROCEDURE 1.PERFORM DTC CONFIRMATION PROCEDURE Turn ignition switch ON. Fully depress the brake pedal for at least 5 seconds. Erase the DTC. Check 1st trip DTC. Diagnosis Procedure 1.CHECK STOP LAMP SWITCH CIRCUIT Turn ignition switch OFF. Check the stop lamp when depressing and releasing the brake pedal. 2.CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT Disconnect stop lamp switch harness connector.

P2096, P2097, P2098, P2099 A/F sensor 1

P2100, P2103 throttle control motor relay

Description Power supply for the throttle control motor is provided to the ECM via the throttle control motor relay. The throttle control motor relay is controlled ON/OFF by the ECM. When the ignition switch is turned ON, the ECM sends an ON signal to throttle control motor relay and battery voltage is provided to the ECM. When the ignition switch is turned OFF, the ECM sends an OFF signal to throttle control motor relay and battery voltage is not provided to the ECM. DTC Logic DTC DETECTION LOGIC DTC CONFIRMATION PROCEDURE 1.PRECONDITIONING If DTC Confirmation Procedure has been previously conducted, always perform the following before conducting the next test.

P2101 electric throttle control function

Description Electric throttle control actuator consists of throttle control motor, throttle position sensor, etc. The throttle control motor is operated by the ECM and it opens and closes the throttle valve. The current opening angle of the throttle valve is detected by the throttle position sensor. The throttle position sensor provides feedback to the ECM, when opens/closes the throttle valve in response to driving conditions via the throttle control motor. DTC Logic DTC DETECTION LOGIC NOTE: If DTC P2101 is displayed with DTC P2100, first perform the trouble diagnosis for DTC P2100. Refer to EC-456, "DTC Logic".

P2118 throttle control motor

Description The throttle control motor is operated by the ECM and it opens and closes the throttle valve. The current opening angle of the throttle valve is detected by the throttle position sensor. The throttle position sensor it provides feedback to the ECM, when opens/closes the throttle valve in response to driving conditions via the throttle control motor. DTC Logic DTC DETECTION LOGIC DTC CONFIRMATION PROCEDURE 1.PRECONDITIONING If DTC Confirmation Procedure has been previously conducted, always perform the following before conducting the next test. Turn ignition switch OFF and wait at least 10 seconds. Turn ignition switch ON. Turn ignition switch OFF and wait at least 10 seconds. 2.

P2119 electric throttle control actuator

Description Electric throttle control actuator consists of throttle control motor, throttle position sensor, etc. The throttle control motor is operated by the ECM and it opens and closes the throttle valve. The throttle position sensor detects the throttle valve position, and the opening and closing speed of the throttle valve and sends the voltage signals to the ECM. The ECM judges the current opening angle of the throttle valve from these signals and opens/closes the throttle valve in response to driving conditions via the throttle control motor. DTC Logic DTC DETECTION LOGIC DTC CONFIRMATION PROCEDURE 1.

P2122, P2123 APP sensor

Description The accelerator pedal position sensor is installed on the upper end of the accelerator pedal assembly. The sensor detects the accelerator position and sends a signal to the ECM. Accelerator pedal position sensor has two sensors. These sensors are a kind of potentiometer which transform the accelerator pedal position into output voltage, and emit the voltage signal to the ECM. In addition, these sensors sends opening and closing speed of the accelerator pedal and feed the voltage signals to the ECM. The ECM judges the current opening angle of the accelerator pedal from these signals and controls the throttle control motor based on these signals.

P2127, P2128 APP sensor

P2135 TP sensor

Description Electric throttle control actuator consists of throttle control motor, throttle position sensor, etc. The throttle position sensor responds to the throttle valve movement. The throttle position sensor has two sensors. These sensors are a kind of potentiometers which transform the throttle valve position into output voltage, and emit the voltage signal to the ECM. In addition, these sensors detect the opening and closing speed of the throttle valve and feed the voltage signals to the ECM.

P2138 APP sensor

ASCD brake switch

Description When the brake pedal is depressed, ASCD brake switch is turned OFF and stop lamp switch is turned ON. ECM detects the state of the brake pedal by those two types of input (ON/OFF signal). Refer to EC-68, "System Diagram" for the ASCD function. Component Function Check 1.CHECK ASCD BRAKE SWITCH FUNCTION With CONSULT Turn ignition switch ON. Select "BRAKE SW1" in "DATA MONITOR" mode with CONSULT. Check "BRAKE SW1" indication under the following conditions. Without CONSULT Turn ignition switch ON. Check the voltage between ECM harness connectors Diagnosis Procedure 1.CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT Turn ignition switch OFF.

ASCD indicator

Description ASCD indicator lamp illuminates to indicate ASCD operation status. CRUISE is integrated in combination meter. CRUISE illuminates when MAIN switch on ASCD steering switch is turned ON to indicated that ASCD system is ready for operation. Refer to EC-68, "System Diagram" for the ASCD function. Component Function Check 1.CHECK ASCD INDICATOR FUNCTION Check ASCD indicator under the following conditions. Diagnosis Procedure 1.CHECK DTC Check that DTC UXXXX is not displayed. 2.CHECK COMBINATION METER FUNCTION 3.

Cooling fan

Description The ECM controls the cooling fan corresponding to the vehicle speed, engine coolant temperature, refrigerant pressure, and air conditioner ON signal. The control system has 4-step control [HIGH/MIDDLE/LOW/OFF]. COOLING FAN MOTOR The cooling fan operates at each speed when the current flows in the cooling fan motor as per the following. The cooling fan operates at low (LOW) speed when cooling fan motors-1 and -2 are circuited in series under the middle speed condition. Component Function Ch 1.CHECK COOLING FAN FUNCTION With CONSULT Turn ignition switch ON. Perform "COOLING FAN" in "ACTIVE TEST" mode with CONSULT. Check that cooling fan speed varies according to the percentage.

Check cooling fan relay

Description The electrical load signal (Headlamp switch signal, rear window defogger switch signal, etc.) is transferred via the CAN communication line from BCM to ECM via the IPDM E/R. Component Function Check 1.CHECK REAR WINDOW DEFOGGER SWITCH FUNCTION Turn ignition switch ON. Connect CONSULT and select "DATA MONITOR" mode. Select "LOAD SIGNAL" and check indication under the following conditions. 2.CHECK LIGHTING SWITCH FUNCTION Check "LOAD SIGNAL" indication under the following conditions. 3.CHECK HEATER FAN CONTROL SWITCH FUNCTION Select "HEATER FAN SW" and check indication under the following conditions. Diagnosis Procedure 1.

Electronic controlled engine mount

Description In the idle range, ECM turns OFF the electronically-controlled engine mount control solenoid valve and applies manifold pressure to the electronically controlled engine mount. This decreases damping force of the electronically- controlled engine mount and absorbs vibrations traveling from the engine to the body for improving the quietness. In the driving range, ECM turns ON the electronically-controlled engine mount control solenoid valve and cuts manifold pressure applied on the electronically-controlled engine mount. This increases damping force of the electronically-controlled engine mount and reduces vibrations generated during driving. Component Function Check 1.

Fuel injector

Description The fuel injector is a small, precise solenoid valve. When the ECM supplies a ground to the fuel injector circuit, the coil in the fuel injector is energized. The energized coil pulls the ball valve back and allows fuel to flow via the fuel injector into the intake manifold. The amount of fuel injected depends upon the injection pulse duration. Pulse duration is the length of time the fuel injector remains open. The ECM controls the injection pulse duration based on engine fuel needs. Component Function Check 1.INSPECTION START Turn ignition switch to START. 2.CHECK FUEL INJECTOR FUNCTION With CONSULT Start engine. Perform "POWER BALANCE" in "ACTIVE TEST" mode with CONSULT.

Fuel pump

Description *: ECM determines the start signal status by the signals of engine speed and battery voltage. The ECM activates the fuel pump for several seconds after the ignition switch is turned ON to improve engine start ability. If the ECM receives a engine speed signal from the camshaft position sensor (PHASE), it knows that the engine is rotating, and causes the pump to operate. If the engine speed signal is not received when the ignition switch is ON, the engine stalls. The ECM stops pump operation and prevents battery discharging, thereby improving safety. The ECM does not directly drive the fuel pump. It controls the ON/OFF fuel pump relay, which in turn controls the fuel pump.

Ignition signal

Description The ignition signal from the ECM is sent to and amplified by the power transistor. The power transistor turns ON and OFF the ignition coil primary circuit. This ON/OFF operation induces the proper high voltage in the coil secondary circuit. Component Function Check 1.INSPECTION START Turn ignition switch OFF, and restart engine. 2.CHECK IGNITION SIGNAL FUNCTION With CONSULT Perform "POWER BALANCE" in "ACTIVE TEST" mode with CONSULT. Check that each circuit produces a momentary engine speed drop. 3.CHECK IGNITION SIGNAL FUNCTION Without CONSULT Let engine idle. Read the voltage signal between ECM harness connectors. NOTE: The pulse cycle changes depending on rpm at idle.

Malfunction indicator lamp

Description The Malfunction Indicator Lamp (MIL) is located on the combination meter. The MIL will illuminate when the ignition switch is turned ON without the engine running. This is a bulb check. When the engine is started, the MIL should turn off. If the MIL remains illuminated, the on board diagnostic system has detected an engine system malfunction. For details, refer to EC-135, "DIAGNOSIS DESCRIPTION : Malfunction Indicator Lamp (MIL)". Component Function Check 1.CHECK MIL FUNCTION Turn ignition switch ON. Check that MIL illuminates. Diagnosis Procedure 1.CHECK DTC Check that DTC UXXXX is not displayed. 2.CHECK COMBINATION METER FUNCTION 3.

On board refueling vapor recovery (ORVR)

Description From the beginning of refueling, the air and vapor inside the fuel tank go via the refueling EVAP vapor cut valve and EVAP/ORVR line to the EVAP canister. The vapor is absorbed by the EVAP canister and the air is released to the atmosphere. When the refueling has reached the full level of the fuel tank, the refueling EVAP vapor cut valve is closed and refueling is stopped because of auto shut-off. The vapor which was absorbed by the EVAP canister is purged during driving. WARNING: When conducting inspections below, be sure to observe the following: Put a "CAUTION: FLAMMABLE" sign in workshop. Never smoke while servicing fuel system.

Positive crankcase ventilation

Description This system returns blow-by gas to the intake manifold. The positive crankcase ventilation (PCV) valve is provided to conduct crankcase blow-by gas to the intake manifold. During partial throttle operation of the engine, the intake manifold sucks the blow-by gas via the PCV valve. Normally, the capacity of the valve is sufficient to handle any blow-by and a small amount of ventilating air. The ventilating air is drawn from the air inlet tubes into the crankcase. In this process the air passes via the hose connecting air inlet tubes to rocker cover. Under full-throttle condition, the manifold vacuum is insufficient to draw the blow-by flow via the valve.

Refrigerant pressure sensor

Description The refrigerant pressure sensor is installed at the condenser of the air conditioner system. The sensor uses an electrostatic volume pressure transducer to convert refrigerant pressure to voltage. The voltage signal is sent to ECM, and ECM controls cooling fan system. Component Function Check 1.CHECK REFRIGERANT PRESSURE SENSOR FUNCTION Start engine and warm it up to normal operating temperature. Turn A/C switch and blower fan switch ON. Check the voltage between ECM harness connector terminals under the following conditions. Diagnosis Procedure 1.CHECK GROUND CONNECTION Turn A/C switch and blower fan switch OFF. Stop engine. Turn ignition switch OFF. Check ground connection E9.

Variable induction air system

Description Power Valves 1 and 2 The power valves 1 and 2 are installed in intake manifold collector and used to control the suction passage of the variable induction air control system. They are set in the fully closed or fully opened position by the power valve actuators 1 and 2 operated by the vacuum stored in the vacuum tank. The vacuum to power valve actuators is controlled by the VIAS control solenoid valves 1 and 2. Component Function Check 1.CHECK OVERALL FUNCTION-I With CONSULT Start engine and warm it up to the normal operating temperature. Perform "VIAS S/V-1" in "ACTIVE TEST" mode with CONSULT.

Nissan Maxima Service and Repair Manual: DTC/circuit diagnosis

Diagnosis system (ECM)

Trouble diagnosis - specification value