U1180

DTC U1180: Combination Meter Time-out

CAUTION:
- If the ECM output the DTC U1180, make sure to diagnose the CAN bus line.
- Before replacing the ECU, make sure that the communication circuit is operating normally.

DESCRIPTIONS OF MONITOR METHODS
There is no data from combination meter for the specified time. (Meter also detect communication error with ECM.)

MONITOR EXECUTION
Continuous

MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)

Other Monitor (There is no temporary DTC stored in memory for the item monitored below)
- Not applicable

Sensor (The sensor below is determined to be normal)
- Not applicable

DTC SET CONDITIONS

Logic Flow Chart:

Check Condition
- Battery positive voltage is between 10 and 16.5 volts.

Judgement Criterion
- Unable to receive combination meter signals through the CAN bus line for 4 seconds.

COMMENT

Current Trouble
- Some of the possible causes are a harness or connector damage between the ECM and the combination meter on the CAN bus line, a failure in the combination meter power supply system, a failure in the combination meter, or a failure in the ECM.

Past Trouble
- Proceed to troubleshoot based on a harness or connector damage on the CAN bus line between the ECM and combination meter, and a failure in the combination meter power supply system. Refer to "How to cope with past trouble".

NOTE: If a malfunction occurred in the past, a failure cannot be discovered through the M.U.T. - III CAN bus diagnosis even if there might be a problem with the CAN bus.

Furthermore, it is possible to narrow down the areas of the possible failures from the DTCs that are output by the ECUs, which are communicating on the CAN bus.

FAIL-SAFE AND BACKUP FUNCTION
- None

OBD-II DRIVE CYCLE PATTERN
None.

TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)
- CAN line harness damage or connector damage.
- Combination meter failed.
- ECM failed.

DIAGNOSIS

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

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







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

Q: Is the CAN bus line normal?

YES : Go to Step 2.

NO : Repair the CAN bus line. Then go to Step 4.

STEP 2. Using scan tool MB991958, read the diagnostic trouble code (DTC).

1. Turn the ignition switch to the "ON" position.
2. Read the combination meter-DTC.
3. Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the combination meter-DTC set?

YES : Refer to Chassis Electrical - Combination Meter Assembly - Diagnostic Trouble Code Chart. B2203

NO : Go to Step 3.

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

1. Turn the ignition switch to the "ON" position.
2. After the MFI-DTC has been deleted, read the MFI-DTC again.
3. Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is DTC U1180 set?

YES : Replace the ECM. When the ECM is replaced, register the ID code. Then go to Step 4.

NO : It can be assumed that this malfunction is intermittent of CAN bus line between ECM and combination meter.

STEP 4. Using scan tool MB991958, read the diagnostic trouble code (DTC).

1. Turn the ignition switch to the "ON" position.
2. After the MFI-DTC has been deleted, read the MFI-DTC again.
3. Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is DTC U1180 set?

YES : Retry the troubleshooting.

NO : The inspection is complete.