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

P0725 ENGINE SPEED SIGNAL

TRANSMISSION: GR6Z30A

P0725

Description


  • The engine speed signal (CAN signal) is transmitted from ECM to TCM via CAN communication.
  • The engine speed signal (pulse signal) is transmitted from ECM to TCM via the hard wire. TCM uses the engine speed signal (pulse signal) for the diagnosis of each speed signal and as a backup signal.

DTC Logic

 
 DTC DETECTION LOGIC

NOTE：
 If DTC P0700 is detected, first diagnose the DTC P0700. Refer to DTC Logic (GT-R certified NISSAN dealer).

DTC
 		Self-diagnosis name
 		DTC detection condition
 		Possible cause
P0725
 		Engine speed CAN signal compatibility*
 		A
 		A DTC is set if the engine speed (CAN signal) is less than 200 rpm when the engine speed (pulse signal) is 700 rpm or more.
 		Harness or connector
(CAN communication line is open or shorted)
B
 		A DTC is set if the difference between the engine speed (CAN signal) and clutch A speed sensor value is 1,000 rpm or more with clutch A engaged.
  • Clutch A speed sensor
  • Harness or connector
    (Open or short in the clutch A speed sensor circuit)
    (CAN communication line is open or shorted)
C
 		A DTC is set if the difference between the engine speed (CAN signal) and clutch B speed sensor value is 1,000 rpm or more with clutch B engaged.
  • Clutch B speed sensor
  • Harness or connector
    (Open or short in the clutch B speed sensor circuit)
    (CAN communication line is open or shorted)
Engine speed pulse signal compatibility
D
 		A DTC is set if the engine speed (pulse signal) is less than 500 rpm when the engine speed (CAN signal) is 1,000 rpm or more.
 		Harness or connector
(Open or short in the circuit between ECM and TCM)
*: A DTC is displayed when A, B or C in the DTC detection conditions is detected.

 
 DTC CONFIRMATION PROCEDURE

■ CAUTION ■
 Be careful of the driving speed.
 
 1.PREPARATION BEFORE OPERATION
 
 2.PERFORM DTC CONFIRMATION PROCEDURE — DTC DETECTION CONDITION A
 
 3.PERFORM DTC CONFIRMATION PROCEDURE — DTC DETECTION CONDITION D
 
 4.PERFORM DTC CONFIRMATION PROCEDURE — DTC DETECTION CONDITION C
 
 5.DTC CONFIRMATION PROCEDURE — DTC DETECTION CONDITION B

Diagnosis Procedure


 
 1.CHECK CAN COMMUNICATION CIRCUIT
 
 2.CHECK CLUTCH A SPEED SENSOR CIRCUIT
 
 3.CHECK CLUTCH B SPEED SENSOR CIRCUIT
 
 4.CHECK GROUND CONNECTION
 
 5.CHECK TCM INPUT SIGNAL CIRCUIT
 
 6.CHECK HARNESS BETWEEN TCM AND ECM (PART 1)
 
 7.CHECK HARNESS BETWEEN TCM AND ECM (PART 2)
 
 8.CHECK INTERMITTENT INCIDENT