Code No.U1109: ETACS-ECU Time-out

caution

If diagnosis code U1109 is set in the combination meter, diagnose the CAN main bus line.

caution

Whenever the ECU is replaced, ensure that the communication circuit is normal.

TROUBLE JUDGMENT

The combination meter receives signal from the ETACS-ECU via CAN bus lines. If it can not receive all the necessary signals from the ETACS-ECU, diagnosis code U1109 is set.

COMMENTS ON TROUBLE SYMPTOM

Current trouble

Connector(s) or wiring harness in the CAN bus lines between the ETACS-ECU and the combination meter, the power supply system to the ETACS-ECU, the ETACS-ECU itself, or the combination meter may be defective.

Past trouble

Carry out diagnosis with particular emphasis on connector(s) or wiring harness in the CAN bus lines between the ETACS-ECU and the combination meter, 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

note

For a past trouble, you may not find it by the M.U.T.-III CAN bus diagnostics even if there is any failure in CAN bus lines. In this case, refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions

). and check the CAN bus lines. You can narrow down the possible cause of the trouble by referring to the diagnosis code, which is set regarding the CAN communication-linked ECUs (Refer to GROUP 54F, Explanation about the M.U.T.-III CAN Bus Diagnostics

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

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 54F, Diagnosis - Can Bus Diagnostics Table ). On completion, go to Step 4.

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 SWS. (Refer to GROUP 54B, Troubleshooting or GROUP 54C, Troubleshooting or GROUP 54D, Troubleshooting or GROUP 54E, Troubleshooting )

	Go to Step 3.

STEP 3. M.U.T.-III diagnosis code

Check that diagnosis code U1206 is set.

Q. Is the diagnosis code set?

	Replace ETACS-ECU and then go to step 4.

	Replace combination meter and then go to step 4.

STEP 4. Check whether the diagnosis code is reset.

Recheck if the diagnosis code is set.

(1)Erase the diagnosis code.

(2)Turn the ignition switch to "ON" position.

(3)Check if the diagnosis code is set.

Q. Is the check result satisfactory?

	The procedure is complete.

	Go to Step 1.