Diagnostic Procedure

WARNING: This page is about a different car, the 2004 Nissan Quest. 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 "ENGINE".
  Turn ignition switch ON and select "SELF-DIAGNOSTIC RESULTS" mode for "ENGINE" with CONSULT-II.
  
  Refer to "MALFUNCTION INDICATOR LAMP (MIL) "
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. Refer to IGNITION SIGNAL
CHECK INPUT SIGNAL (WITH CONSULT-II)
With CONSULT-II
1. Start engine.
  
  Fig 1: CONSULT-II Display - DATA MONITOR
  Courtesy of NISSAN MOTOR CO., U.S.A.
2. Select "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.
OK or NG
1. OK: GO TO 5.
2. 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 ".
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.
  
  Fig 2: Checking Voltage Between TCM Harness Connector E143 Terminal 39 (W/G) And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
2. Check voltage between TCM harness connector E143 terminal 39 (W/G) and ground.
  Voltage - Refer to ECM INSPECTION TABLE (ECM terminal 103) .
OK or NG
1. OK: GO TO 5.
2. NG: 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. Refer to "TCM TERMINALS AND REFERENCE VALUE ".
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.