Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Infiniti QX56. 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 OFF.
2. Disconnect A/T assembly harness connector.
3. Check voltage between A/T assembly harness connector terminals and ground.
Fig 1: A/T Assembly Harness Connector Terminals Voltage Chart
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 2: Checking Voltage Between A/T Assembly Harness Connector Terminals & 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. Disconnect A/T assembly harness connector.
2. Turn ignition switch ON. (Do not start engine.)
3. Check voltage between A/T assembly harness connector terminals and ground.
Fig 3: A/T Assembly Harness Connector Terminals Voltage Chart
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 4: Checking Voltage Between A/T Assembly Harness Connector Terminals & Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
1. OK: GO TO 4.
2. NG: GO TO 3.
DETECT MALFUNCTIONING ITEM
Check the following items:
- Harness for short or open between battery and A/T assembly harness connector terminals 1, 2
- Harness for short or open between ignition switch and A/T assembly harness connector terminal 6
- 10A fuse [No. 19, located in the fuse block (J/B)] and 10A fuse (No. 49, located in the IPDM E/R)
- Ignition switch, Refer to "POWER SUPPLY ROUTING CIRCUIT ".
OK or NG
1. OK: GO TO 4.
2. NG: Repair or replace damaged parts.
CHECK TCM GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect A/T assembly harness connector.
3. Check continuity between A/T assembly harness connector terminals and ground.
  
  Fig 5: Checking Continuity Between A/T Assembly Harness Connector Terminals & Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
  1. Continuity should exist.
  If OK, check harness for short to ground and short to power.
OK or NG
1. OK: GO TO 5.
2. NG: Repair open circuit or short to ground or short to power in harness or connectors.
DETECT MALFUNCTIONING ITEM
Check the following items:
- The A/T assembly harness connector terminals for damage or loose connection with harness connector.
OK or NG
1. OK: GO TO 6.
2. NG: Repair or replace damaged parts.
PERFORM SELF-DIAGNOSIS
Perform self-diagnosis. Refer to "SELF-DIAGNOSTIC RESULT MODE ".

OK or NG
1. OK: INSPECTION END
2. NG: Self-diagnosis does not activate: GO TO 7.
3. NG-2: DTC is displayed: Check the malfunctioning system. Refer to "SELF-DIAGNOSTIC RESULT MODE ".
CHECK TERMINAL CORD ASSEMBLY
1. Remove control valve with TCM. Refer to "CONTROL VALVE WITH TCM AND A/T FLUID TEMPERATURE SENSOR 2 ".
2. Disconnect A/T assembly harness connector and TCM connector.
3. Check continuity between A/T assembly harness connector terminals and TCM connector terminals.
  
  Fig 6: A/T Assembly Harness Connector Terminals & TCM Connector Terminals Continuity Chart
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 7: Checking Continuity Between A/T Assembly Harness Connector Terminals & TCM Connector Terminals
  Courtesy of NISSAN MOTOR CO., U.S.A.
4. Check continuity between A/T assembly harness connector terminals and TCM connector terminals.
  
  Fig 8: A/T Assembly Harness Connector Terminals And TCM Connector Terminals Continuity Chart
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 9: Checking Continuity Between A/T Assembly Harness Connector Terminals & TCM Connector Terminals
  Courtesy of NISSAN MOTOR CO., U.S.A.
5. If OK, check harness for short to ground and short to power.
OK or NG
1. OK: Replace the control valve with TCM. Refer to "CONTROL VALVE WITH TCM AND A/T FLUID TEMPERATURE SENSOR 2 ".
2. NG: Replace open circuit or short to ground and short to power in harness or connectors.