INSPECTION PROCEDURE 5: 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 fuel gauge 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 6  .
2. STEP 2. Check the engine coolant temperature gauge unit. 

   Check to see that the engine coolant temperature gauge unit operate normally. Refer to FUEL LEVEL SENSOR FLOAT HEIGHT  .

   Q: Is the engine coolant temperature gauge unit normal? 

   1. YES:  Go to Step 3.
   2. NO:  Replace the engine coolant temperature gauge unit. The engine coolant temperature gauge should work normally.
3. STEP 3. Check engine coolant temperature gauge unit connector B-112 and combination meter connector C-02 for damage. 

   Q: Are engine coolant temperature gauge unit connector B-112 and combination meter connector C-02 in good condition? 

   1. YES:  Go to Step 4.
   2. NO:  Repair or replace the connector. Refer to HARNESS CONNECTOR INSPECTION . The engine coolant temperature gauge should work normally.
      Fig 1: Identifying B-112 Terminal Connectors

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
      Fig 2: Identifying B-112 Terminal Connectors

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
      Fig 3: Identifying C-02 Terminal Connectors

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
4. STEP 4. Check the wiring harness between engine coolant temperature gauge unit connector B-112 (terminal 1) and combination meter connector C-02 (terminal 50.) 
   Fig 4: Identifying B-112 Terminal Connectors (2.0L)

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   Fig 5: Identifying B-112 Terminal Connectors (2.4L)

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   Fig 6: Identifying C-02 Terminal Connectors

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   NOTE: Also check intermediate connector C-124. 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 should work normally.
   2. NO:  Repair the wiring harness. The engine coolant temperature gauge should work normally.
      Fig 7: Identifying C-124 Terminal Connectors

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.