Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.

CHECK TCM POWER SOURCE STEP 1
1. Turn ignition switch to ON position. (Do not start engine.)
2. Check voltage between TCM harness connectors E142, E143 terminals 10 (R/Y), 19 (R/Y), 28 (Y/R) and ground.
  
  Fig 1: Checking Voltage Between TCM Harness Connectors E142, E143 Terminals 10, 19, 28 & Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
  - Voltage: Battery voltage
OK or NG
- OK: GO TO 2.
- NG: GO TO 3.
CHECK TCM POWER SOURCE STEP 2
1. Turn ignition switch to OFF position.
2. Check voltage between TCM harness connector E143 terminal 28 (Y/R) and ground.
  
  Fig 2: Checking Voltage Between TCM Harness Connector E143 Terminal 28 & Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
  - Voltage: Battery voltage
OK or NG
- OK: GO TO 4.
- NG: GO TO 3.
DETECT MALFUNCTIONING ITEM
Check the following items:
- Fuse
- Harness for short or open between battery, ignition switch and TCM harness connectors E142, E143 terminals 10 (R/Y), 19 (R/Y) and 28 (Y/R)
- Ignition switch
  Refer to "POWER SUPPLY ROUTING CIRCUIT ".
OK or NG
- OK: GO TO 4.
- NG: Repair or replace damaged parts.
CHECK TCM GROUND CIRCUIT
1. Turn ignition switch to OFF position.
2. Disconnect TCM harness connector.
3. Check continuity between TCM harness connector E143 terminals 25 (B), 48 (B) and ground. Refer to "WIRING DIAGRAM - AT - MAIN ".
  
  Fig 3: Checking Continuity Between TCM Harness Connector E143 Terminals 25, 48 & Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
  - Continuity should exist.
  If OK, check harness for short to ground and short to power.
OK or NG
- OK: INSPECTION END
- NG: Repair open circuit or short to ground or short to power in harness or connectors.