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

Required Special Tool 

1. 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 the engine coolant temperature gauge unit. 

   Check to see that the engine coolant temperature gauge unit operate normally. Refer to FUEL GAUGE UNIT 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 unit should work normally.
3. STEP 3. Check engine coolant temperature gauge unit connector B-109 and combination meter connector C-04 for damage. 

   Q: Are engine coolant temperature gauge unit connector B-109 and combination meter connector C-04 in good condition? 

   1. YES:  Go to Step 4.
   2. NO:  Repair or replace the connector. The engine coolant temperature gauge unit should work normally.
   Fig 1: Locating Engine Coolant Temperature Gauge Unit Connector B-109

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   Fig 2: Locating Combination Meter 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-109 (terminal 1) and combination meter connector C-04 (terminal 44). 
   NOTE: Also check intermediate connector C-104. If intermediate connector C-104 is damaged, repair or replace the connector .

   Q: Are the wiring harness between engine coolant temperature gauge unit connector B-109 (terminal 1) and combination meter connector C-04 (terminal 44) in good condition? 

   Fig 3: Locating Engine Coolant Temperature Gauge Unit Connector B-109

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   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.
   Fig 4: Locating Combination Meter Connector C-04 & Intermediate Connector C-104

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.