Combination Meter Assembly

DTC U1108: Combination meter time-out.

CAUTION:
- If DTC U1108 is set in the multi-center display unit (middle grade type), always diagnose the CAN main bus line.
- Whenever the multi-center display unit (middle grade type) is replaced, ensure that the power supply circuit and the ground circuit are normal.

NOTE: When the DTC relating to the CAN communication error are set, make sure of the vehicle equipment. When the vehicle is not equipped with the system the multi-center display unit (middle grade type) communicates to, the DTC is always set. This is not abnormal.

TROUBLE JUDGMENT
The multi-center display unit (middle grade type) receives combination meter-related signal from the combination meter. If the multi-center display unit (middle grade type) cannot receive the signal, DTC U1108 will be set.

TECHNICAL DESCRIPTION (COMMENT)

Current trouble
- Connector(s) or wiring harness in the CAN bus lines between the combination meter and the multi-center display unit (middle grade type), the power supply system to the combination meter, the combination meter itself, or the multi-center display unit (middle grade type) may be defective.

Past trouble
- If DTC U1108 is stored as a past trouble, carry out diagnosis with particular emphasis on wiring and connector(s) in the CAN bus line between the combination meter and the multi-center display unit (middle grade type), and the power supply system to the combination meter.

NOTE: You cannot find a past trouble, by the M.U.T.-III CAN bus diagnostics even if there is a failure in CAN bus lines. In this case, check the CAN bus lines. You can narrow down the possible cause of the trouble by referring to the DTC, which is set regarding the CAN communication-linked ECUs. (Refer to CAN bus line Diagnostics Flow. Explanation About the Scan Tool (M.U.T.-III) CAN Bus Diagnostics

TROUBLESHOOTING HINTS
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector
- The combination meter may be defective
- The multi-center display unit (middle grade type) may be defective

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

Use scan tool MB991958 to diagnose the CAN bus lines.







1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to "ON" position.
3. Diagnose the CAN bus line.

Q: Is the check result satisfactory?

YES : Go to Step 2.

NO : Repair the CAN bus lines. On completion, go to Step 6.

STEP 2. Using scan tool MB991958, read combination meter diagnostic trouble code

Check that the combination meter sets a DTC.

Q: Is the DTC set?

YES : Diagnose the combination meter. Diagnostic Trouble Code Descriptions

NO : Go to Step 3.

STEP 3. Using scan tool MB991958, read the diagnostic trouble code.

Check if a DTC, which relates to CAN communication-linked systems below, is set.

Powertrain control module
- DTC U1108: Combination meter time-out

ETACS-ECU
- DTC U1108: Combination meter time-out

Q: Is the DTC set?

YES : Go to Step 4.

NO : Go to Step 5.

STEP 4. Recheck for diagnostic trouble code.

Recheck if the DTC is set.

1. Erase the DTC.
2. Turn the ignition switch to "ON" position.
3. Check if the DTC is set.

Q: Is the DTC set?

YES : Replace Combination meter and then go to step 6.

NO : A poor connection, open circuit or other intermittent malfunction is present in the CAN bus lines between the Combination meter and the multi-center display unit (middle grade type).

STEP 5. Recheck for diagnostic trouble code.

Recheck if the DTC is set.

1. Erase the DTC.
2. Turn the ignition switch to "ON" position.
3. Check if the DTC is set.

Q: Is the DTC set?

YES : Replace multi-center display unit (middle grade type) and then go to step 6.

NO : A poor connection, open circuit or other intermittent malfunction is present in the CAN bus lines between the Combination meter and the multi-center display unit (middle grade type).

STEP 6. Recheck for diagnostic trouble code.

Recheck if the DTC is set.

1. Erase the DTC.
2. Turn the ignition switch to "ON" position.
3. Check if the DTC is set.

Q: Is the DTC set?

YES : Go to Step 1.

NO : The procedure is complete.