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Nissan Sentra Service Manual: P2127, P2128 APP Sensor

Nissan Sentra Service Manual / Engine / Engine control system / Dtc/circuit diagnosis / P2127, P2128 APP Sensor

DTC Logic

DTC DETECTION LOGIC

DTC No.

 CONSULT screen terms (Trouble diagnosis content)

 DTC detecting condition

 Possible cause
P2127 APP SEN 2/CIRC (Throttle/Pedal position sensor/switch “E” circuit low) An excessively low voltage from the APP sensor 2 is sent to ECM.
  • Harness or connectors (APP sensor 2 circuit is open or shorted.)
  • Accelerator pedal position sensor (APP sensor 2)
  • Sensor power supply 2 circuit
P2128 APP SEN 2/CIRC (Throttle/Pedal position sensor/switch “E” circuit high) An excessively high voltage from the APP sensor 2 is sent to ECM.

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure 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.

>> GO TO 2.

2.PERFORM DTC CONFIRMATION PROCEDURE

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

Is DTC detected? YES >> Proceed to EC-435, "Diagnosis Procedure".

NO >> INSPECTION END

Diagnosis Procedure

1.CHECK APP SENSOR 2 POWER SUPPLY

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

Is the inspection result normal?


Is the inspection result normal? YES >> GO TO 3.

NO >> GO TO 2.

2.CHECK SENSOR POWER SUPPLY 2 CIRCUIT

Check sensor power supply 2 circuit. Refer to EC-444, "Diagnosis Procedure".

Is the inspection result normal? YES >> Perform the trouble diagnosis for power supply circuit.

NO >> Repair or replace error-detected parts.

3.CHECK APP SENSOR 2 GROUND CIRCUIT

  1. Turn ignition switch OFF.
  2. Disconnect ECM harness connector.
  3. Check the continuity between APP sensor harness connector and ECM harness connector.


  1. Also check harness for short to power.

Is the inspection result normal? YES >> GO TO 4.

NO >> Repair or replace error-detected parts.

4.CHECK APP SENSOR 2 INPUT SIGNAL CIRCUIT

  1. Check the continuity between APP sensor harness connector and ECM harness connector.


  1. Also check harness for short to ground and to power.

Is the inspection result normal? YES >> GO TO 5.

NO >> Repair or replace error-detected parts.

5.CHECK APP SENSOR

Check APP sensor. Refer to EC-436, "Component Inspection (APP Sensor)".

Is the inspection result normal? YES >> Check intermittent incident. Refer to GI-39, "Intermittent Incident".

NO >> Replace accelerator pedal assembly. Refer to ACC-3, "Removal and Installation".

Component Inspection (APP Sensor)

1.CHECK ACCELERATOR PEDAL POSITION SENSOR

  1. Turn ignition switch OFF.
  2. Reconnect all harness connectors disconnected.
  3. Turn ignition switch ON.
  4. Check the voltage between ECM harness connector terminals as per the following condition.

Is the inspection result normal?


Is the inspection result normal?

YES >> INSPECTION END

NO >> Replace accelerator pedal assembly. Refer to ACC-3, "Removal and Installation".

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