Diagnostic Procedure

Check DTC With ECM
- Check P code with CONSULT-II "ENGINE".
  Turn ignition switch ON and select "SELF-DIAGNOSTIC RESULTS" mode for "ENGINE" with CONSULT-II. Re.
1. OK or NG
OK: (with CONSULT-II) GO TO 2.

OK: (without CONSULT- GO TO 4.

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: Display Data Monitor Mode For A/T With Consult-II
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK: GO TO 5.

NG: GO TO 3.
Detect Malfunctioning Item
Check the following items:
- Harness for short or open between TCM and ECM
- Resistor and ignition coil
  Refer to IGNITION SIGNAL .
1. OK or NG
OK: GO TO 5.

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 F50 terminal 39 (W/G) and ground.
  
  Fig 2: Checking Voltage Between TCM Harness Connector And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
1. OK or NG
OK: GO TO 5.

NG: GO TO 3.
Check DTC
Perform DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION PROCEDURE .
1. OK or NG
OK: Inspection End

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 harness connector.
1. OK or NG
OK: Inspection End

NG: Repair or replace damaged parts.