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 TCM POWER SOURCE STEP 1
1. Turn ignition switch to ON position.
  (Do not start engine.)
2. Check voltage between TCM harness connector M119, M120 terminals 10, 19, 28 and ground.
  
  Fig 1: Checking Voltage Between TCM Harness Connector M119, M120 Terminals 10, 19, 28 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 2.
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 M120 terminal 28 and ground.
  
  Fig 2: Checking Voltage Between TCM Harness Connector M120 Terminal 28 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 4.
2. NG: GO TO 3.
DETECT MALFUNCTIONING ITEM
Check the following items:
- Harness for short or open between ignition switch and TCM harness connector M119, M120 terminals 10, 19 and 28 (Main harness)
- Ignition switch and 10A or 7.5A fuse [No. 18 or 24, located in the fuse block (J/B)]
  Refer to "POWER SUPPLY ROUTING ".
OK or NG
1. OK: GO TO 4.
2. 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 M120 terminals 25, 48 and ground.
  Continuity should exist.
  
  If OK, check harness for short to ground and short to power.
OK or NG
1. OK: INSPECTION END
2. NG: Repair open circuit or short to ground or short to power in harness or connectors.