Code No. U1206: Flag invalid

caution

If diagnosis code No. U1206 is set in the combination meter, diagnose the CAN main bus line.

TROUBLE JUDGMENT

When the ignition switch is in the LOCK (OFF) position, the combination meter receives door-open signal and so on or communication standby instruction from the ETACS-ECU and keeps CAN communication. If there is a contradiction between these two signals, diagnosis code No. U1206 will be set.

COMMENTS ON TROUBLE SYMPTOM

The M.U.T.-III shows a diagnosis code status as active.

The door switch system of the ETACS-ECU, the ETACS-ECU, or the combination meter may be defective.

The M.U.T.-III shows a diagnosis code status as stored.

Carry out diagnosis with particular emphasis on connector(s) or wiring harness between the ETACS-ECU and the door switch, and the power supply system to the ETACS-ECU. For diagnosis procedures, refer to "How to cope with past trouble" (Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points ).

PROBABLE CAUSES

Damaged harness wires and connectors
Malfunction of ETACS-ECU
Malfunction of combination meter

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics

warning

Since the radiator fan rotates during CAN bus line diagnostics, make sure that no one is servicing the engine compartment before diagnosing the CAN bus line. Since the CAN communication stops when diagnosing the CAN bus line, the ETACS-ECU detects the time-out of the engine-ECU, and activates the radiator fan to prevent overheating as fail-safe.

Use the M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result satisfactory?

Go to Step 2.

Repair the CAN bus lines (Refer to GROUP 54C, Troubleshooting

). Repair the CAN bus line and go to Step 3.

STEP 2. M.U.T.-III other system diagnosis code

Check that the ETACS-ECU sets a diagnosis code.

Q. Is the diagnosis code set?

Diagnose the ETACS system. Refer to GROUP 54B, Troubleshooting

Go to Step 3.

STEP 3. Replace the ETACS-ECU, and check whether the diagnosis code is reset.

After the ETACS-ECU is replaced, then perform the variant coding and write the VIN data (Refer to GROUP 00, Precautions Before Service - How to Perform Variant Coding

). Then check that the diagnosis code is reset.

Q. Is the diagnosis code set?

Go to Step 1.

The procedure is complete.