DIAGNOSTIC ITEM 5: Diagnose when the scan tool cannot receive the data sent by combination meter.: Diagnosis

Required Special Tools: 

• MB991223: Harness Set
• MB992006: Extra fine probe

1. STEP 1. Check joint connector (3) C-03 and combination meter connector C-04 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Check the joint connector at the wiring harness side for loose, corroded or damaged terminals, or terminals pushed back in the connector, and also check the short pin behind the connector for corrosion, deformation and delamination.

   Q: Are joint connector (3) C-03 and combination meter connector C-04 in good condition? 

   YES :  Go to Step 2.

   NO :  Repair the damaged parts. Replace the joint connector as necessary.

   Fig 1: Identifying Connectors C-03, C-04

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   Fig 2: Identifying Short Pin

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2. STEP 2. Check the CAN bus lines between joint connector (3) and the combination meter. Measure the resistance between joint connector (3) C-03 and combination meter connector C-04. 
   CAUTION:

   • A digital multimeter should be used. For details refer to SERVICE PRECAUTIONS  .
   • The test wiring harness should be used. For details refer to SERVICE PRECAUTIONS  .
   1. Disconnect joint connector (3) C-03 and combination meter connector C-04, and measure the resistance between each wiring harness side connector.
      Fig 3: Identifying Connectors C-03, C-04

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   2. Measure the resistance between joint connector (3) terminal 4 and combination meter connector terminal 3.

      OK: 2 ohms or less 

      Fig 4: Measuring Resistance Between Joint Connector Terminal 4 & Combination Meter Connector Terminal 3

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   3. Measure the resistance between joint connector (3) terminal 15 and combination meter connector terminal 4.

      OK: 2 ohms or less 

      CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to PRECAUTIONS ON HOW TO REPAIR THE CAN BUS LINES  .

   Q: Do all the resistances measure 2 ohms or less? 

   YES :  Go to Step 3.

   NO :  Repair the wiring harness between joint connector (3) and the combination meter connector.

   Fig 5: Measuring Resistance Between Joint Connector Terminal 15 & Combination Meter Connector Terminal 4

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
3. STEP 3. Check the terminator resistor inside the combination meter. Measure the resistance at combination meter connector C-04. 
   1. Disconnect combination meter C-04, and measure the resistance at the component side of combination meter connector C-04.
      Fig 6: Identifying Connector C-04 Terminals

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   2. Measure the resistance between combination meter connector terminals 3 and 4.

      OK: 120 +/- 20 ohms 

   Q: Does the resistance measure 120 +/- 20 ohms? 

   YES :  Refer to Chassis Electrical - Combination Meter - INSPECTION PROCEDURES .

   NO :  Replace the combination meter.

   Fig 7: Measuring Resistance Between Combination Meter Connector Terminals 3 & 4

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.