INSPECTION PROCEDURE 3: Tachometer does not Work.: Diagnosis

Required Special Tools: 

• MB991223: Harness Set
• MB991958: Scan Tool (MUT-III Sub Assembly)
  • MB991824: Vehicles Communication Interface (V.C.I.)
  • MB991827: MUT-III USB Cable
  • MB991911: MUT-III Main Harness B (Vehicles without CAN communication system)

1. STEP 1. Check with other meter. 

   Check to see that the speedometer, fuel gauge and water thermometer operate normally.

   Q: Do all other meters operate? 

   YES < other meters all operate >.  : Go to  Step 2.

   NO < one of the meters do not operate >.  : Refer to INSPECTION PROCEDURE 6: COMBINATION METER DOES NOT WORK. .

2. STEP 2. Using scan tool MB991958, read the diagnostic trouble code. 
   CAUTION: To prevent damage to scan tool MB991502 or MB991958, always turn the ignition switch to "LOCK" (OFF) position before connecting or disconnecting scan tool.
   1. Connect scan tool MB991958 to the data link connector.
   2. Turn the ignition switch to "ON" position.
   3. Read the MFI system diagnostic trouble code.

   Q: Is DTC output to the MFI system? 

   YES  : Refer to MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS <2.0L> or MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS <2.4L> .

   NO  : Go to  Step 3.

   Fig 1: Connecting Scan Tool To Data Link Connector

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3. STEP 3. Check combination meter connector C-01 and ECM connector C-117 <2.0L-M/T>, C-137 <2.4L-M/T> or PCM connector C-118 <2.4L-A/T>, C-138 <2.4L-A/T> for damage. 
   Fig 2: Identifying C-01 Connector Terminals

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   Fig 3: Identifying Terminals Of C-117 (2.0L), C-137 (2.4L) (M/T) Connector

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   Q: Are combination meter connector C-01 and ECM connector C-117 <2.0L-M/T>, C-137 <2.4L-M/T> or PCM connector C-118 <2.4L-A/T>, C-138 <2.4L-A/T> in good condition? 

   YES  : Go to  Step 4.

   NO  : Repair or replace the connector. Refer to HARNESS CONNECTOR INSPECTION . The tachometer should work normally.

   Fig 4: Identifying Terminals Of C-118 (2.0L), C-138 (2.4L) (A/T) Connector

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4. STEP 4. Check the wiring harness between combination meter connector C-01 (terminal 11) and ECM connector C-117 <2.0L-M/T> (terminal 58), C-137 <2.4L-M/T> (terminal 87) or PCM connector C-118 <2.0L-A/T> (terminal 43), C-138 <2.4L-A/T> (terminal 87). 
   Fig 5: Identifying C-01 Connector Terminals

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   Fig 6: Identifying Terminals Of C-117 (2.0L), C-137 (2.4L) (M/T) Connector

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   Q: Are the wiring harness between combination meter connector C-01 (terminal 11) and ECM connector C-117 <2.0L-M/T> (terminal 58), C-137 <2.4L-M/T> (terminal 87) or PCM connector C-118 <2.0L-A/T> (terminal 43), C-138 <2.4L-A/T> (terminal 87) in good condition? 

   YES  : Go to  Step 5.

   NO  : Repair the wiring harness. The tachometer should work normally.

   Fig 7: Identifying Terminals Of C-118 (2.0L), C-138 (2.4L) (A/T) Connector

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
5. STEP 5. Replace the combination meter and check. 

   Q: Does the tachometer operate? 

   YES  : There is no action to be taken.

   NO  : Replace the ECM < M/T > or PCM < A/T >. The tachometer should work normally.