DIAGNOSTIC ITEM 15: Diagnose When The Scan Tool Cannot Receive The Data Sent By KOS-ECU: Diagnosis

Required Special Tools: 

• MB991223: Harness Set
• MB992006: Extra Fine Probe

1. STEP 1. Check joint connector (CAN1) C-105 and KOS-ECU connector C-05 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 
   CAUTION:

   The strand end of the twisted wire should be within 10 cm (4 inches) from the connector. For details refer to SERVICE PRECAUTIONS  .

   Q: Are joint connector (CAN1) C-105 and KOS-ECU connector C-05 in good condition? 

   1. YES:  Go to Step 2.
   2. NO:  Repair the damaged parts.
2. STEP 2. Check the wiring harness between joint connector (CAN1) C-105 and KOS-ECU connector C-05 for open circuit. 
   CAUTION:

   Strictly observe the specified wiring harness repair procedure. For details refer to SERVICE PRECAUTIONS  .

   1. Disconnect joint connector (CAN1) C-105 and KOS-ECU connector C-05, and check the wiring harness.
   2. Check the wiring harness between joint connector (CAN1) C-105 (terminal 5) and KOS-ECU connector C-05 (terminal 1)

      OK: Continuity exists (2 Ω or less) 

      Fig 1: Measuring Resistance Between Joint Connector C-105 Terminal 5 & KOS-ECU Connector C-05 Terminal 1

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   3. Check the wiring harness between joint connector (CAN1) C-105 (terminal 16) and KOS-ECU connector C-05 (terminal 2)

      OK: Continuity exists (2 Ω or less) 

      Fig 2: Measuring Resistance Between Joint Connector C-105 Terminal 16 & KOS-ECU Connector C-05 Terminal 2

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

   Q: Is the wiring harness between joint connector (CAN1) C-105 and KOS-ECU connector C-05 in good condition? 

   1. YES:  Check the power supply circuit of the KOS-ECU. Refer to DIAGNOSIS .
   2. NO:  Repair the wiring harness between joint connector (CAN1) C-105 and KOS-ECU connector C-05.