Nissan GT-R (R35) · Service Manual ENGINE

P2127, P2128 APP SENSOR

VR38

P2127 P2128

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.

PBIB1741E.JPG
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 detect the opening and closing speed of the accelerator pedal and sends 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

DTC No.
 		Trouble diagnosis name
 		DTC detecting condition
 		Possible cause
P2127
 		Accelerator pedal position sensor 2 circuit low input
 		An excessively low voltage from the APP sensor 2 is sent to ECM.
  • Harness or connectors
    (APP sensor 2 circuit is open or shorted.)
    [CKP sensor (POS) circuit is shorted.]
    [CMP sensor (PHASE) (bank 2) circuit is shorted.]
    (Power steering puressure sensor circuit is shorted.)
    (Manifold absolute pressure sensor circuit is shorted.)
    (Refrigerant pressure sensor circuit is shorted.)
  • Accelerator pedal position sensor (APP sensor 2)
  • Crankshaft position sensor (POS)
  • Camshaft position sensor (PHASE) (bank 2)
  • Power steering puressure sensor
  • Manifold absolute pressure sensor
  • Refrigerant pressure sensor
P2128
 		Accelerator pedal position sensor 2 circuit high input
 		An excessively high voltage from the APP sensor 2 is sent to ECM.

 
 DTC CONFIRMATION PROCEDURE

 
 1.PRECONDITIONING
 
 2.PERFORM DTC CONFIRMATION PROCEDURE

Diagnosis Procedure


 
 1.CHECK GROUND CONNECTION
 
 2.CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-I
 
 3.CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-II
 
 4.DETECT MALFUNCTIONING PART
 
 5.CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-III
 
 6.CHECK COMPONENTS
 
 7.CHECK APP SENSOR 2 GROUND CIRCUIT FOR OPEN AND SHORT
 
 8.DETECT MALFUNCTIONING PART
 
 9.CHECK APP SENSOR 2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
 
 10.DETECT MALFUNCTIONING PART
 
 11.CHECK APP SENSOR
 
 12.REPLACE ACCELERATOR PEDAL ASSEMBLY
 
 13.CHECK INTERMITTENT INCIDENT

Component Inspection


 
 1.CHECK ACCELERATOR PEDAL POSITION SENSOR
 
 2.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