Diagnosis Procedure

Regarding Wiring Diagram information, refer to "WIRING DIAGRAM ".

1. CHECK TRANSFER CONTROL UNIT POWER SUPPLY AND GROUND CIRCUITS

   Refer to "DIAGNOSIS PROCEDURE ".

   Are the inspection results normal? 

   YES: GO TO 2.

   NO: Perform repairs as necessary.

2. CHECK COMBINATION METER POWER SUPPLY CIRCUIT
   1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
   2. Disconnect combination meter harness connector.
   3. Check voltage between combination meter harness connector terminals and ground.

      Connector	Terminal	Voltage (Approx.)
      M24	16 - Ground	0V

      Fig 1: Checking Voltage Between Combination Meter Connector M24 Terminal 16 And Ground

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   4. Turn ignition switch "ON". (Do not start engine.)
   5. Check voltage between combination meter harness connector terminals and ground.

      Connector	Terminal	Voltage (Approx.)
      M24	16 - Ground	Battery voltage

      Fig 2: Checking Voltage Between Combination Meter Connector M24 Terminal 16 And Ground

      Courtesy of NISSAN NORTH AMERICA, INC.

      Are the inspection results normal? 

      YES: GO TO 3.

      NO: Check the following. If any items are damaged, repair or replace damaged parts.

      • 10A fuse [No. 14, located in the fuse block (J/B)] or ignition switch.
      • Harness for short or open between ignition switch and combination meter harness connector terminal 16
3. CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND COMBINATION METER
   1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
   2. Check continuity between transfer control unit harness connector M166 terminal 38 and combination meter harness connector M24 terminal 28.

      Continuity should exist  .

      Fig 3: Checking Continuity Between Transfer Control Unit Connector M166 Terminal 38 And Combination Meter Connector M24 Terminal 28

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      Also check harness for short to ground and short to power.

      Is there continuity? 

      YES: GO TO 4.

      NO: Repair or replace damaged parts.

4. CHECK INDICATOR LAMP CIRCUIT
   1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
   2. Connect combination meter harness connector.
   3. Disconnect transfer control unit harness connector.
   4. Turn ignition switch "ON". (Do not start engine.)
   5. Ground the following terminal using suitable wiring.
      • Transfer control unit harness connector M166 terminal 38 and ground.
        Fig 4: Checking Indicator Lamp Circuit

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        Does the indicator lamp turn on? 

        YES: GO TO 5.

        NO: Replace the combination meter. Refer to "REMOVAL AND INSTALLATION ".

5. SYMPTOM CHECK

   Check again.

   Does the symptom still occur? 

   YES: GO TO 6.

   NO: Inspection End.

6. CHECK TRANSFER CONTROL UNIT

   Check transfer control unit input/output signal. Refer to "REFERENCE VALUE ".

   Are the inspection results normal? 

   YES: Inspection End.

   NO: Check transfer control unit pin terminals for damage or loose connection with harness connector. If any items are damaged, repair or replace damaged parts.