Nissan GT-R (R35) · Service Manual TRANSMISSION & DRIVELINE

P0840 CLUTCH A PRESSURE SENSOR

TRANSMISSION: GR6Z30A

P0840

Description


  • The clutch A pressure sensor is installed on the front control module and detects the pressure applied to the clutch A.
  • The clutch A pressure sensor converts the pressure applied to the clutch A into output voltage and transmits the signal to TCM. TCM uses this signal in calculations for control switching or other functions.
  • The clutch A pressure sensor output voltage varies depending on the pressure variations. The voltage increases as the pressure increases.

DTC Logic

 
 DTC DETECTION LOGIC

NOTE：
 If DTC P0700 is detected, first diagnose the DTC P0700. Refer to DTC Logic (NHPC).

DTC
 		Self-diagnosis name
 		DTC detection condition
 		Possible cause
P0840
 		Clutch A pressure sensor voltage
  • A DTC is set if the clutch A pressure sensor voltage value received by TCM is more than 4,700 mV.
  • A DTC is set if the clutch A pressure sensor voltage value received by TCM is less than 90 mV.
  • Clutch A pressure sensor
  • TCM
  • Harness or connector
    (Open or short in the clutch A pressure sensor circuit)

 
 DTC CONFIRMATION PROCEDURE

 
 1.PREPARATION BEFORE OPERATION (PART 1)
 
 2.PREPARATION BEFORE OPERATION (PART 2)
 
 3.PERFORM DTC CONFIRMATION PROCEDURE

Diagnosis Procedure


 
 1.CHECK GROUND CONNECTION
 
 2.CHECK TCM OUTPUT SIGNAL CIRCUIT
 
 3.CHECK TCM POWER SUPPLY
 
 4.CHECK TCM INPUT SIGNAL CIRCUIT
 
 5.CHECK INTERMITTENT INCIDENT
 
 6.CHECK HARNESS BETWEEN TCM AND TRANSMISSION (CLUTCH A PRESSURE SENSOR) (PART 1)
 
 7.CHECK HARNESS BETWEEN TCM AND TRANSMISSION (CLUTCH A PRESSURE SENSOR) (PART 2)
 
 8.CHECK INTERMITTENT INCIDENT