Nissan GT-R (R35) · Service Manual ENGINE

P0550 PSP SENSOR

VR38

P0550

Description


Power steering pressure (PSP) sensor is installed to the power steering high-pressure tube and detects a power steering load.
This sensor is a potentiometer which transforms the power steering load into output voltage, and emits the voltage signal to the ECM. The ECM controls the electric throttle control actuator and adjusts the throttle valve opening angle to increase the engine speed and adjusts the idle speed for the increased load.

DTC Logic

 
 DTC DETECTION LOGIC

NOTE：
 If DTC P0550 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
P0550
 		Power steering pressure sensor circuit
 		An excessively low or high voltage from the sensor is sent to ECM.
  • Harness or connectors
    [Power steering pressure sensor circuit is shorted.]
    [CKP sensor (POS) circuit is open or shorted.]
    [CMP sensor (PHASE) (bank 2) circuit is shorted.]
    (Manifold absolute pressure sensor circuit is shorted.)
    (APP sensor 2 circuit is shorted.)
    (Refrigerant pressure sensor circuit is shorted.)
  • Power steering pressure sensor
  • Crankshaft position sensor (POS)
  • Camshaft position sensor (PHASE) (bank 2)
  • Manifold absolute pressure sensor
  • Accelerator pedal position sensor
  • Refrigerant pressure sensor

 
 DTC CONFIRMATION PROCEDURE

 
 1.PRECONDITIONING
 
 2.PERFORM DTC CONFIRMATION PROCEDURE

Diagnosis Procedure


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

Component Inspection


 
 1.CHECK POWER STEERING PRESSURE SENSOR