DIAGNOSTIC ITEM 9: Diagnose When The Scan Tool Cannot Receive The Data Sent By ASC-ECU: Diagnosis

Required Special Tools:

MB991223: Harness Set
MB992006: Extra Fine Probe
MB991997: ASC Check Harness

STEP 1. Check joint connector (CAN3) C-127 and ASC-ECU connector A-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 (CAN3) C-127 and ASC-ECU connector A-05 in good condition?
1. YES: Go to Step 2.
2. NO: Repair the damaged parts.
STEP 2. Check the wiring harness between joint connector (CAN3) C-127 and ASC-ECU connector A-05 for open circuit.
CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to SERVICE PRECAUTIONS .
1. Disconnect joint connector (CAN3) C-127 and ASC-ECU connector A-05, and check the wiring harness.
2. Check the wiring harness between joint connector (CAN3) C-127 (terminal 9) and ASC-ECU connector A-05 (terminal 12)
  OK: Continuity exists (2 Ω or less)
  
  Fig 1: Measuring Resistance Between Joint Connector C-127 Terminal 9 & ASC-ECU Connector A-05 Terminal 12
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
3. Check the wiring harness between joint connector (CAN3) C-127 (terminal 20) and ASC-ECU connector A-05 (terminal 13)
  OK: Continuity exists (2 Ω or less)
  
  Q: Is the wiring harness between joint connector (CAN3) C-127 and ASC-ECU connector A-05 in good condition?
  1. YES: Check the power supply circuit of the ASC-ECU. Refer to INSPECTION PROCEDURE 11: ASC-ECU POWER SUPPLY CIRCUIT SYSTEM .
  2. NO: Repair the wiring harness between joint connector (CAN3) C-127 and ASC-ECU connector A-05.
    
    Fig 2: Measuring Resistance Between Joint Connector C-127 Terminal 20 & ASC-ECU Connector A-05 Terminal 13
    Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.