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INSPECTION PROCEDURE 4: Engine Coolant Temperature Gauge does not Work.: Diagnosis

Required Special Tool: 

MB991223: Harness Set

  1. STEP 1. Check with other meter. 

    Check to see that the speedometer, tachometer and engine coolant temperature gauge unit operate normally.

    Q: Do all other meters operate? 

    1. YES < other meters all operate. >:  Go to Step 2.
    2. NO < one of the meters do not operate. >:  Refer to INSPECTION PROCEDURE 5  .
  2. STEP 2. Check engine coolant temperature gauge unit connector B-112 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Is engine coolant temperature gauge unit connector B-112 in good condition? 

    1. YES :  Go to Step 3.
    2. NO :  Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION . The engine coolant temperature gauge unit should work normally.
    Fig 1: Identifying Connector B-112 Terminal
    G02399162Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  3. STEP 3. Check the engine coolant temperature gauge unit. 

    Check to see that the engine coolant temperature gauge unit operate normally. Refer to ENGINE COOLANT TEMPERATURE GAUGE UNIT CHECK .

    Q: Is the engine coolant temperature gauge unit normal? 

    1. YES :  Go to Step 4.
    2. NO :  Replace the engine coolant temperature gauge unit. The engine coolant temperature gauge unit should work normally.
  4. STEP 4. Check combination meter connector C-02 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Is combination meter connector C-02 in good condition? 

    1. YES :  Go to Step 5.
    2. NO :  Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION . The engine coolant temperature gauge unit should work normally.
    Fig 2: Identifying Combination Meter Connector C-02 Terminal
    G02399163Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  5. STEP 5. Check the wiring harness between engine coolant temperature gauge unit connector B-112 (terminal 1) and combination meter connector C-02 (terminal 50). 
    Fig 3: Identifying Temperature Gauge Unit Connector B-112 Terminal
    G02399164Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    Fig 4: Identifying Connector C-02 And C-124 Terminal
    G02399165Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    NOTE: Also check intermediate connector C-124 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-124 is damaged, repair or replace the connector as described in HARNESS CONNECTOR INSPECTION

    Q: Are the wiring harness between engine coolant temperature gauge unit connector B-112 (terminal 1) and combination meter connector C-02 (terminal 50) in good condition? 

    1. YES :  Repair or replace the combination meter. The engine coolant temperature gauge unit should work normally.
    2. NO :  Repair the wiring harness. The engine coolant temperature gauge unit should work normally.
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