Nissan Maxima Service and Repair Manual: P0127 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.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: This test may be conducted with the drive wheels lifted in the shop or by driving the vehicle. If a road test is expected to be easier, it is unnecessary to lift the vehicle.
2.PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT
- Wait until engine coolant temperature is less than 90C (194F)
- Turn ignition switch ON.
- Select "DATA MONITOR" mode with CONSULT.
- Check the engine coolant temperature.
- If the engine coolant temperature is not less than 90C (194F), turn ignition switch OFF and cool down engine.
NOTE: Perform the following steps before engine coolant temperature is above 90C (194F).
- Turn ignition switch ON.
- Select "DATA MONITOR" mode with CONSULT.
- Start engine.
- Hold vehicle speed at more than 70 km/h (43 MPH) for 100 consecutive seconds. CAUTION: Always drive vehicle at a safe speed.
- Check 1st trip DTC.
With GST
Follow the procedure "With CONSULT" above.
Diagnosis Procedure
1.CHECK GROUND CONNECTION
- Turn ignition switch OFF.
- Check ground connection E9.
2.CHECK INTAKE AIR TEMPERATURE SENSOR
3.CHECK INTERMITTENT INCIDENT
Component Inspection
1.CHECK INTAKE AIR TEMPERATURE SENSOR
- Turn ignition switch OFF.
- Disconnect mass air flow sensor harness connector.
- Check resistance between mass air flow sensor terminals as per the following.
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 a ...
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 ...
Other materials:
P0197, P0198 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 te ...
Front power seat adjustment
Operating tips
The power seat motor has an auto-reset
overload protection circuit. If the motor
stops during operation, wait 30 seconds
then reactivate the switch.
Do not operate the power seat switch for a
long period of time when the engine is off.
This will discharge the bat ...
Hazard switch
Component Function Check
1.CHECK HAZARD SWITCH SIGNAL BY CONSULT
CONSULT DATA MONITOR
Turn ignition switch ON.
Select "HAZARD SW" of BCM (FLASHER) DATA MONITOR item.
With operating the hazard switch, check the monitor status.
Diagnosis Procedure
1.CHECK HAZARD SWITCH SIGNAL INPUT
...
Nissan Maxima Owners Manual
- Illustrated table of contents
- Safety-Seats, seat belts and supplemental restraint system
- Instruments and controls
- Pre-driving checks and adjustments
- Monitor, climate, audio, phone and voice recognition systems
- Starting and driving
- In case of emergency
- Appearance and care
- Do-it-yourself
- Maintenance and schedules
- Technical and consumer information
Nissan Maxima Service and Repair Manual
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