Nissan Sentra manuals

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".

P2122, P2123 APP Sensor
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-353, "DTC Logic". DTC No ...

2135 TP Sensor
DTC Logic DTC DETECTION LOGIC NOTE: If DTC P2135 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to EC-353, "DTC Logic". DTC No. CONSUL ...

Other materials:

Removal and installation
OIL COOLER Exploded View M/T models Clamp Water hose Clamp Water hose Oil cooler O-rings CVT models Clamp Water hose Clamp Water hose Water hose clip Oil cooler Clamp Water hose O-rings To CVT oil warmer Removal and Installation REMOVAL Re ...

Precaution
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT PRE-TENSIONER" The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along with a front seat belt, helps to reduce the risk or severity of injur ...

Precautions for Suspension
When installing rubber bushings, the final tightening must be carried out under unladen conditions with tires on ground. Spilled oil might shorten the life of rubber bushings. Be sure to wipe off any spilled oil. Unladen conditions mean that fuel, engine coolant and lubricant are ...

© 2014-2025 Copyright www.nisentra.com