Nissan GT-R (R35) · Service Manual ENGINE

P2122, P2123 APP SENSOR

VR38

P2122 P2123

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

NOTE：
 If DTC P2122 or P2123 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to DTC Logic (GT-R certified NISSAN dealer).

DTC No.
 		Trouble diagnosis name
 		DTC detecting condition
 		Possible cause
P2122
 		Accelerator pedal position sensor 1 circuit low input
 		An excessively low voltage from the APP sensor 1 is sent to ECM.
  • Harness or connectors
    (APP sensor 1 circuit is open or shorted.)
  • Accelerator pedal position sensor
    (APP sensor 1)
P2123
 		Accelerator pedal position sensor 1 circuit high input
 		An excessively high voltage from the APP sensor 1 is sent to ECM.

 
 DTC CONFIRMATION PROCEDURE

 
 1.PRECONDITIONING
 
 2.PERFORM DTC CONFIRMATION PROCEDURE

Diagnosis Procedure


 
 1.CHECK GROUND CONNECTION
 
 2.CHECK APP SENSOR 1 POWER SUPPLY CIRCUIT
 
 3.DETECT MALFUNCTIONING PART
 
 4.CHECK APP SENSOR 1 GROUND CIRCUIT FOR OPEN AND SHORT
 
 5.DETECT MALFUNCTIONING PART
 
 6.CHECK APP SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
 
 7.DETECT MALFUNCTIONING PART
 
 8.CHECK APP SENSOR
 
 9.REPLACE ACCELERATOR PEDAL ASSEMBLY
 
 10.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