Diagnostic Procedure

WARNING: This page is about a different car, the 2003 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.

CHECK INPUT SIGNAL.
With CONSULT-II
1. Start engine.
2. Select "TCM INPUT SIGNALS" in "DATA MONITOR" mode for "A/T" with CONSULT-II.
3. Read out the value of "VHCL/S SE.MTR" while driving.
  Check the value changes according to driving speed.
  
  Fig 1: CONSULT-II (Data Monitor Display)
  Courtesy of NISSAN MOTOR CO., U.S.A.
Without CONSULT-II
1. Start engine.
2. Check voltage between TCM harness connector M120 terminal 40 and ground while driving at 2 to 3 km/h (1 to 2 MPH) for 1 m (3 ft) or more.
  
  Fig 2: Checking Voltage Between TCM Harness Connector M120 Terminal 40 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
Does battery voltage vary between less than 1V and more than 4.5V?
1. Yes: GO TO 3.
2. No: GO TO 2.
DETECT MALFUNCTIONING ITEM
Check the following items:
- Vehicle speed sensor and ground circuit for vehicle speed sensor
  Refer to "HEADLAMP (FOR USA) ".
- Harness for short or open between TCM and vehicle speed sensor (Main harness)
- Harness for short or open between ABS actuator and electrical unit and combination meter
OK or NG
1. OK: GO TO 3.
2. NG: Repair or replace damaged parts.
CHECK DTC
Perform DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION PROCEDURE , .

OK or NG
1. OK: INSPECTION END
2. NG: GO TO 4.
CHECK TCM INSPECTION
1. Perform TCM input/output signal inspection.
2. If NG, recheck TCM pin terminals for damage or loose connection with harness connector.
OK or NG
1. OK: INSPECTION END
2. NG: Repair or replace damaged parts.