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 DTC WITH ECM
- Check P code with CONSULT-II.
  Turn ignition switch "ON" and select "SELF-DIAG RESULTS" mode for "ENGINE" with CONSULT-II.
OK or NG
1. OK (With CONSULT-II): GO TO 2.
2. OK (Without CONSULT-II): GO TO 4.
3. NG: Check ignition signal circuit for engine control.
CHECK INPUT SIGNAL (WITH CONSULT-II)
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 "ENGINE SPEED".
  Check engine speed changes according to throttle position.
  
  Fig 1: CONSULT-II (Data Monitor Display)
  Courtesy of NISSAN MOTOR CO., U.S.A.
1. Yes: GO TO 5.
2. No: GO TO 3.
DETECT MALFUNCTIONING ITEM
Check the following items:
- Harness for short or open between TCM and ECM
- Resistor
- Ignition coil
OK or NG
1. OK: GO TO 5.
2. NG: Repair or replace damaged parts.
CHECK INPUT SIGNAL (WITHOUT CONSULT-II)
Without CONSULT-II
1. Start engine.
2. Check voltage between TCM harness connector M120 terminal 39 and ground.
  
  Fig 2: Checking Voltage Between TCM Harness Connector M120 Terminal 39 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
1. Yes: GO TO 5.
2. No: GO TO 3.
CHECK DTC
Perform DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION PROCEDURE , .

OK or NG
1. OK: INSPECTION END
2. NG: GO TO 6.
CHECK TCM INSPECTION
1. Perform TCM input/output signal inspection.
2. If NG, recheck TCM pin terminals for damage or loose connection with connector.
OK or NG
1. OK: INSPECTION END
2. NG: Repair or replace damaged parts.