Inspection Procedure 1

INSPECTION PROCEDURE 1: Communication with Scan Tool is Not Possible.

CIRCUIT OPERATION
The combination meter is linked to the data link connector via CAN bus line to communicate with the scan tool.

TECHNICAL DESCRIPTION (COMMENT)
If the system does not communicate with scan tool, power supply to data link connector or CAN bus lines may be defective.

TROUBLESHOOTING HINTS
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

DIAGNOSIS

Required Special Tools:
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: Vehicle Communication Interface (V.C.I.)
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A (Vehicles with CAN communication system)

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?

YES: Go to Step 2.

NO: Refer to MFI Diagnosis - Diagnostic Trouble Code Chart.

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?

YES: Diagnose the power supply circuit.

NO: Repair the CAN bus lines (Refer to Information Bus, Diagnosis - Can Bus Diagnostic Chart).