Your Vehicle: 2009 Nissan-Datsun Altima V6-3.5L (VQ35DE)
 
Vehicle » A L L Diagnostic Trouble Codes ( DTC ) » Testing and Inspection » P Code Charts » P2127  
 
 
  P2127  
 

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.
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.
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

  

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.
>> 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 >> Go to Diagnosis Procedure.
NO >> Inspection END

Diagnosis Procedure
1.CHECK GROUND CONNECTION

  1. Turn ignition switch OFF.
  2. Check ground connection E9. Refer to Ground Inspection in See: Testing and Inspection\Initial Inspection and Diagnostic Overview\Service Information For Electrical Incident\Circuit Inspection. Is the Inspection result normal?

YES >> GO TO 2.
NO >> Repair or replace ground connection.
2.CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-I

  1. Disconnect accelerator pedal position (APP) sensor harness connector.
  2. Turn ignition switch ON.

  

  1. Check the voltage between APP sensor harness connector and ground.

  

Is the Inspection result normal?
YES >> GO TO 6.
NO >> GO TO 3.
3.CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-II

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

  

Is the Inspection result normal?
YES >> GO TO 4.
NO >> Repair open circuit.
4.CHECK SENSOR POWER SUPPLY CIRCUIT
Check harness for short to power and short to ground, between the following terminals.

  

Is the Inspection result normal?
YES >> GO TO 5.
NO >> Repair short to ground or short to power in harness or connectors.
5.CHECK COMPONENTS
Check the following.

YES >> GO TO 10.
NO >> Replace malfunctioning components.
6.CHECK APP SENSOR 2 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.

  

  1. Also check harness for short to ground and short to power. Is the Inspection result normal?

YES >> GO TO 7.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
7.CHECK APP SENSOR 2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

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

  

  1. Also check harness for short to ground and short to power. Is the Inspection result normal?

YES >> GO TO 8.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
8.CHECK APP SENSOR
Refer to Component Inspection.
Is the Inspection result normal?
YES >> GO TO 10.
NO >> GO TO 9.
9.REPLACE ACCELERATOR PEDAL ASSEMBLY

  1. Replace accelerator pedal assembly.
  2. Refer to Special Repair Requirement >> Inspection END

10.CHECK INTERMITTENT INCIDENT
Refer to See: Testing and Inspection\Initial Inspection and Diagnostic Overview\Service Information For Electrical Incident\Intermittent Incident.
>> Inspection END

Component Inspection
1.CHECK ACCELERATOR PEDAL POSITION SENSOR

  1. Reconnect all harness connectors disconnected.
  2. Turn ignition switch ON.

  

  1. Check the voltage between ECM harness connector terminals under the following conditions.

  

Is the Inspection result normal?
YES >> Inspection END
NO >> GO TO 2.
2.REPLACE ACCELERATOR PEDAL ASSEMBLY

  1. Replace accelerator pedal assembly.
  2. Go to Special Repair Requirement. >> Inspection END

Special Repair Requirement
1.PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING
Refer to See: Powertrain Management\Computers and Control Systems\Accelerator Pedal Position Sensor\Testing and Inspection\Special Repair Requirement.
>> GO TO 2.
2.PERFORM THROTTLE VALVE CLOSED POSITION LEARNING
Refer to See: Powertrain Management\Computers and Control Systems\Testing and Inspection\Programming and Relearning\Throttle Valve Closed Position Learning\Special Repair Requirement.
>> GO TO 3.
3.PERFORM IDLE AIR VOLUME LEARNING
Refer to See: Engine, Cooling and Exhaust\Engine\Idle Speed\Testing and Inspection\Idle Air Volume Learning\Special Repair Requirement.
>> END