Nissan Maxima Service and Repair Manual: 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.

Idle position of the accelerator pedal is determined by the ECM receiving the signal from the accelerator pedal position sensor. The ECM uses this signal for engine operations such as fuel cut.

DTC Logic

DTC DETECTION LOGIC

NOTE: If DTC P2122 or P2123 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643.

Refer to EC-394, "DTC Logic".

Nissan Maxima. 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.

  1. Turn ignition switch OFF and wait at least 10 seconds.
  2. Turn ignition switch ON.
  3. 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

  1. Start engine and let it idle for 1 second.
  2. Check DTC.

Diagnosis Procedure

1.CHECK GROUND CONNECTION

  1. Turn ignition switch OFF.
  2. Check ground connection E9.

2.CHECK APP SENSOR 1 POWER SUPPLY CIRCUIT

Nissan Maxima. CHECK APP SENSOR 1 POWER SUPPLY CIRCUIT

  1. Disconnect accelerator pedal position (APP) sensor harness connector.
  2. Turn ignition switch ON.
  3. Check the voltage between APP sensor harness connector and ground.

Nissan Maxima. CHECK APP SENSOR 1 POWER SUPPLY CIRCUIT

3.CHECK APP SENSOR 1 GROUND CIRCUIT FOR OPEN AND SHORT

  1. Turn ignition switch OFF.
  2. Disconnect ECM harness connector.
  3. Check the continuity between APP sensor harness connector and ECM harness connector.
  4. Also check harness for short to ground and short to power.

    Is the

Nissan Maxima. CHECK APP SENSOR 1 GROUND CIRCUIT FOR OPEN AND SHORT

4.CHECK APP SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

  1. Check the continuity between APP sensor harness connector and ECM harness connector
  2. Also check harness for short to ground and short to power.

Nissan Maxima. CHECK APP SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

5.CHECK APP SENSOR

6.REPLACE ACCELERATOR PEDAL ASSEMBLY

  1. Replace accelerator pedal assembly.

7.CHECK INTERMITTENT INCIDENT

Component Inspection

1.CHECK ACCELERATOR PEDAL POSITION SENSOR

Nissan Maxima. CHECK ACCELERATOR PEDAL POSITION SENSOR

  1. Reconnect all harness connectors disconnected.
  2. Turn ignition switch ON.
  3. Check the voltage between ECM harness connector terminals under the following conditions.

Nissan Maxima. CHECK ACCELERATOR PEDAL POSITION SENSOR

2.REPLACE ACCELERATOR PEDAL ASSEMBLY

  1. Replace accelerator pedal assembly.

Special Repair Requirement

1.PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING

2.PERFORM THROTTLE VALVE CLOSED POSITION LEARNING

3.PERFORM IDLE AIR VOLUME LEARNING

    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 ...

    P2127, P2128 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. ...

    Other materials:

    Spark plugs
    Replacing spark plugs Iridium-tipped spark plugs It is not necessary to replace iridium-tipped A spark plugs as frequently as conventional type spark plugs because they last much longer. Follow the maintenance log shown in the "Maintenance and schedules" section of this manual. Do not ser ...

    NISSAN vehicle immobilizer system-nats symptoms
    Symptom Table Security indicator does not turn ON or flash. CAUTION:  Follow Trouble Diagnosis Flowchart referring to "SEC-4, "Work Flow"". Determine malfunctioning condition before performing this diagnosis.  Check that vehicle is under the condition shown in "Co ...

    Exhaust gas (carbon monoxide)
    WARNING Do not breathe exhaust gases; they contain colorless and odorless carbon monoxide. Carbon monoxide is dangerous. It can cause unconsciousness or death. If you suspect that exhaust fumes are entering the vehicle, drive with all windows fully open, and have the vehicle in ...

    Nissan Maxima Owners Manual

    Nissan Maxima Service and Repair Manual

    © 2017-2023 Copyright www.nimainfo.com
    0.0056