DIAGNOSTIC ITEM 12: Diagnose the lines between the ETACS-ECU and joint connector (CAN2): Diagnosis

Required Special Tools: 

• MB991223: Harness Set
• MB992006: Extra Fine Probe

1. STEP 1. Check joint connector (CAN2) C-104 and ETACS-ECU connector C-301 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 (CAN2) C-104 and ETACS-ECU connector C-301 in good condition? 

   YES  : Go to Step 2.

   NO  : Repair the damaged parts.

2. STEP 2. Check the wiring harness between joint connector (CAN2) C-104 and ETACS-ECU connector C-301 for open circuit. 
   CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to SERVICE PRECAUTIONS  .
   1. Disconnect joint connector (CAN2) C-104 and ETACS-ECU connector C-301, and check the wiring harness.
   2. Check the wiring harness between joint connector (CAN2) C-104 (terminal 6) and ETACS-ECU connector C-301 (terminal 9)

      OK: Continuity exists (2 Ω or less) 

      Fig 1: Checking Wiring Harness Between Joint Connector (CAN2) And ETACS-ECU Connector Terminals

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   3. Check the wiring harness between joint connector (CAN2) C-104 (terminal 19) and ETACS-ECU connector C-301 (terminal 8)
      Fig 2: Checking Wiring Harness Between Joint Connector (CAN2) And ETACS-ECU Connector Terminals

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

      OK: Continuity exists (2 Ω or less) 

   Q: Is the wiring harness between joint connector (CAN2) C-104 and ETACS-ECU connector C-301 in good condition? 

   YES  : Go to Step 3.

   NO  : Repair the wiring harness between joint connector (CAN2) C-104 and ETACS-ECU connector C-301.

3. STEP 3. Using scan tool MB991958, diagnose the CAN bus line. 
   CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
   1. Connect scan tool MB991958 to the data link connector.
   Fig 3: Connecting Scan Tool To Data Link Connector
   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   2. Turn the ignition switch to the "ON" position.
   3. Diagnose CAN bus lines, and check if the scan tool screen is as shown in the illustration.
      Fig 4: Checking Scan Tool Screen While Diagnose CAN Bus Lines (M/T)

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
      Fig 5: Checking Scan Tool Screen While Diagnose CAN Bus Lines (TC-SST)

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

   Q: Does the scan tool screen correspond to the illustration? 

   YES  : The trouble can be an intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).

   NO  : Replace the ETACS-ECU.