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.)
2. Check voltage between TCM terminals 10, 19, 28 and ground.
  
  Fig 1: Checking TCM Power Source - Step 1
  Courtesy of NISSAN MOTOR CO., U.S.A.
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 terminal 28 and ground.
  
  Fig 2: Checking TCM Power Source - Step 2
  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 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 .
  
  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 connectors.