Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Nissan Sentra. 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.)
  
  Fig 1: Checking TCM Power Source - Step 1
  Courtesy of NISSAN MOTOR CO., U.S.A.
2. Check voltage between TCM terminals 10 (BR/R), 19 (BR/R), 28 (R/B) and ground.
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.
  
  Fig 2: Checking TCM Power Source - Step 2
  Courtesy of NISSAN MOTOR CO., U.S.A.
2. Check voltage between TCM terminal 28 (R/B) and ground.
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 terminals 10, 19 and 28 (Main harness)
- Fuse
- Ignition switch
  Refer to POWER DISTRIBUTION .
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 terminals 25, 48 and ground. Refer to Wiring Diagram - AT - MAIN .
  Continuity should exist.
OK or NG
1. OK: INSPECTION END
2. NG: Repair open circuit or short to ground or short to power in harness or connectors.