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

P0720 OUTPUT SHAFT SPEED SENSOR

TRANSMISSION: GR6Z30A

P0720

Description


  • The output shaft speed sensor detects the front reduction gear speed. The output shaft speed sensor converts the front reduction gear speed into pulse signal and transmits the signal to TCM.
  • The vehicle speed signal (meter) is transmitted via the CAN communication from the ABS actuator and electric unit (control unit) through the combination meter to TCM. TCM calculates the output shaft speed based on the vehicle speed signal (meter) and uses it for the diagnosis of each speed sensor and as a backup signal.

DTC Logic

 
 DTC DETECTION LOGIC

NOTE：
 If DTC U1000 is detected, first diagnose the DTC U1000. Refer to DTC Logic (GT-R certified NISSAN dealer).

DTC
 		Self-diagnosis name
 		DTC detection condition
 		Possible cause
P0720
 		Output shaft speed CAN signal compatibility *1
 		A
 		A DTC is set if the status 1 or 2 below is detected with an even gear engaged.
  1. The difference between the output shaft speed sensor value and the output shaft speed converted from the vehicle speed signal (meter) (CAN signal) is 1,000 rpm or more.
  2. The difference between the output shaft speed converted from the vehicle speed signal (meter) (CAN signal) and the output shaft speed converted from the clutch A speed is 1,000 rpm or more.
  • Combination meter
  • ABS actuator and electric unit (control unit)
  • Wheel sensor
  • Harness or connector
    (CAN communication line is open or shorted)
    (Open or short in the wheel speed sensor circuit)
B
 		A DTC is set if the status 1 or 2 below is detected with an odd gear engaged.
  1. The difference between the output shaft speed sensor value and the output shaft speed converted from the vehicle speed signal (meter) (CAN signal) is 1,000 rpm or more.
  2. The difference between the output shaft speed converted from the vehicle speed signal (meter) (CAN signal) and the output shaft speed converted from the clutch B speed is 1,000 rpm or more.
Output shaft speed pulse signal compatibility *2
 		C
 		A DTC is set if the status 1 or 2 below is detected with an even gear engaged.
  1. The difference between the output shaft speed sensor value and the output shaft speed converted from the vehicle speed signal (meter) (CAN signal) is 1,000 rpm or more.
  2. The difference between the output shaft speed sensor value and the output shaft speed converted from the clutch A speed is 1,000 rpm or more.
  • Output shaft speed sensor
  • Harness or connector
    (Open or shorted in the output shaft speed sensor circuit)
D
 		A DTC is set if the status 1 or 2 below is detected with an odd gear engaged.
  1. The difference between the output shaft speed sensor value and the output shaft speed converted from the vehicle speed signal (meter) (CAN signal) is 1,000 rpm or more.
  2. The difference between the output shaft speed sensor value and the output shaft speed converted from the clutch B speed is 1,000 rpm or more.
  • *1: A DTC is displayed when A or B in the DTC detection conditions is detected.
  • *2: A DTC is displayed when C or D 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, B
 
 3.PERFORM DTC CONFIRMATION PROCEDURE — DTC DETECTION CONDITION C, D

Diagnosis Procedure


 
 1.CHECK CAN COMMUNICATION CIRCUIT
 
 2.CHECK DTC WITH COMBINATION METER
 
 3.CHECK DTC WITH ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
 
 4.CHECK GROUND CONNECTION
 
 5.CHECK TCM OUTPUT SIGNAL CIRCUIT
 
 6.CHECK TCM INPUT SIGNAL CIRCUIT
 
 7.CHECK INTERMITTENT INCIDENT
 
 8.CHECK HARNESS BETWEEN TCM AND TRANSMISSION (OUTPUT SHAFT SPEED SENSOR) (PART 1)
 
 9.CHECK HARNESS BETWEEN TCM AND TRANSMISSION (OUTPUT SHAFT SPEED SENSOR) (PART 2)
 
 10.CHECK INTERMITTENT INCIDENT