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
- Malfunction of the combination meter
- 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: V.C.I.
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A

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 Controller Area Network (CAN), Diagnosis - Can Bus Diagnostic Chart).

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. Inspection Procedure 2

NO : Replace the combination meter.