INSPECTION PROCEDURE 1: Communication with scan tool is not possible: Diagnosis

Required Special Tools: 

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
  • MB991824: V.C.I.
  • MB991827: M.U.T.-III USB Cable
  • MB991910: M.U.T.-III Main Harness A

1. STEP 1. Using scan tool MB991958, diagnose the CAN bus line. 

   Use scan tool MB991958 to diagnose the CAN bus lines.

   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.
   2. Turn the ignition switch to "ON" position.
   3. Diagnose the CAN bus line.
   4. Turn the ignition switch to the "LOCK" (OFF) position.

   Q: Is the check result satisfactory? 

   YES:  Go to Step  2.

   NO:  Repair the CAN bus lines (Refer to CAN BUS DIAGNOSTIC CHART ).

   Fig 1: Connecting Scan Tool To Data Link Connector

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
2. STEP 2. Check that the ECM < M/T> or PCM < A/T> communicates with the scan tool. 
   1. Turn the ignition switch to "ON" position.
   2. Check if scan tool MB991958 can communicate with the ECM < M/T> or PCM < A/T>.
   3. Turn the ignition switch to the "LOCK" (OFF) position.

   Q: Is the check result satisfactory? 

   YES:  Diagnose the power supply circuit. Refer to INSPECTION PROCEDURE 2: POWER SUPPLY CIRCUIT .

   NO:  Replace the combination meter.

   Fig 2: Connecting Scan Tool To Data Link Connector

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.