Inspection Procedure 1: Communication With Scan Tool Is Not Possible: Diagnosis

WARNING: This page is about a different car, the 2004 Mitsubishi Galant. However, it is still accessible from the selected car via links, so may be relevant.

Required Special Tools:

MB991958: Scan Tool (MUT-III Sub Assembly)
MB991824: Vehicle Communication Interface (V.C.I.)
MB991827: MUT-III USB Cable
MB991911: MUT-III Main Harness A (Vehicles with CAN communication systems)

STEP 1. Check that the powertrain control module communicates with the scan tool.
1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to "ON" position.
3. Check if scan tool MB991958 can communicate with the powertrain control module.
Q: Is the check result satisfactory?
1. YES: Go to Step 2.
2. NO: Refer to DIAGNOSTIC TROUBLE CODE CHART or DIAGNOSTIC TROUBLE CODE CHART .
  
  Fig 1: Connecting Scan Tool (MB991958) To Data Link Connector
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
STEP 2. Using scan tool MB991958, diagnose the CAN bus line
Use scan tool MB991958 to diagnose the CAN bus lines.

Q: Is the check result satisfactory?
1. YES: Diagnose the power supply circuit. Refer to INSPECTION PROCEDURE 2: POWER SUPPLY CIRCUIT, INSPECTION PROCEDURE 3: ODOMETER AND TRIP METER ARE NOT DISPLAYED, INSPECTION PROCEDURE 4: ALL THE NEEDLE METERS DO NOT WORK PROCEDURE 5: WHEN THE IGNITION SWITCH IS TURNED TO THE ON POSITION, THE INDICATOR AND WARNING LIGHTS DO NOT ILLUMINATE .
2. NO: Repair the CAN bus lines (Refer to DIAGNOSTIC TROUBLE CODE DIAGNOSIS ).