DIAGNOSTIC ITEM 21: Diagnose when the scan tool cannot receive the data sent by CAN box unit <vehicles with MMCS>: Diagnosis

WARNING: This page is about a different variant/trim than selected.

Required Special Tools:

MB991223: Harness Set
MB992006: Extra Fine Probe

STEP 1. Check joint connector (CAN1) C-06, CAN box unit connector C-108 and intermediate connector C-105 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-06, CAN box unit connector C-108 and intermediate connector C-105 in good condition?
1. YES: Go to Step 2.
2. NO: Repair the damaged parts.
STEP 2. Check the wiring harness between joint connector (CAN1) C-06 and CAN box unit connector C-108 for open circuit.
CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to SERVICE PRECAUTIONS .
1. Disconnect joint connector (CAN1) C-06 and CAN box unit connector C-108, and check the wiring harness.
2. Check the wiring harness between joint connector (CAN1) C-06 (terminal 7) and CAN box unit connector C-108 (terminal 8)
  OK: Continuity exists (2 Ω or less)
  
  Fig 1: Checking Wiring Harness Between Joint Connector C-06 And CAN Box Unit Connector C-108
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
3. Check the wiring harness between joint connector (CAN1) C-06 (terminal 20) and CAN box unit connector C-108 (terminal 9)
  OK: Continuity exists (2 Ω or less)
  
  Q: Is the wiring harness between joint connector (CAN1) C-06 and CAN box unit connector C-108 in good condition?
  1. YES: Check the power supply circuit of the CAN box unit. Refer to DIAGNOSIS .
  2. NO: Repair the wiring harness between joint connector (CAN1) C-06 and CAN box unit connector C-108.
    
    Fig 2: Checking Wiring Harness Between Joint Connector C-06 And CAN Box Unit Connector C-108
    Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.