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 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 5: COMBINATION METER DOES NOT WORK. .
2. STEP 2. 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 .

   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 the engine coolant temperature gauge unit connector B-107 and combination meter connector C-04 for damage. 

   Q: Are engine coolant temperature gauge unit connector B-107 and combination meter connector C-04 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 Connector B-107

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   Fig 2: Identifying Connector C-04

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
4. STEP 4. Check the wiring harness between engine coolant temperature gauge unit connector B-107 (terminal 1) and combination meter connector C-04 (terminal 50). 
   Fig 3: Identifying Connector B-107

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   Fig 4: Identifying Connector C-04

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   NOTE: Also check intermediate connector C-118. If intermediate connector C-118 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-107 (terminal 1) and combination meter connector C-04 (terminal 50) in good condition? 

   1. YES:  Repair or replace the combination meter. The fuel gauge should work normally.
   2. NO:  Repair the wiring harness. The engine coolant temperature gauge should work normally.
   Fig 5: Identifying Connector C-118

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.