Code No. U0167: KOS-ECU Communication Error

caution

If diagnosis code U0167 is stored in the engine-ECU, surely perform CAN bus line diagnosis.

caution

Replace ECU after certainly confirming that the communication circuits are normal.

TROUBLE JUDGEMENT

Check Conditions

After the engine is cranked.
Ignition switch is "ON" position.

Judgement Criterion

Unable to receive KOS-ECU signals through the CAN bus line.

COMMENTS ON TROUBLE SYMPTOM

Current malfunction

The failure is possibly caused by malfunction of the harness and connector in CAN bus line between engine-ECU and KOS-ECU, by malfunction in the power supply system of KOS-ECU, in KOS-ECU itself, in engine-ECU.

Past malfunction

Proceed with troubleshooting focusing on malfunction of the harness and connector in CAN bus line between engine-ECU and KOS-ECU and malfunction in the power supply system of KOS-ECU. For diagnosis procedure, refer to how to cope with past malfunctions. (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Treat Past Trouble

note

In the case of past malfunctions, M.U.T.-III CAN bus line diagnosis cannot detect a malfunction even if there is a malfunction in CAN bus. Therefore, check CAN bus line as in the case of response to intermittent malfunctions (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction

). It is possible to narrow down areas with a high possibility of malfunctions from diagnosis codes stored in each ECU that performs CAN communication (Refer to GROUP 54C - Explanation about the M.U.T.-III CAN Bus Diagnostics

FAIL-SAFE AND BACKUP FUNCTION

Engine start is prohibited.

PROBABLE CAUSES

Failed harness and connector
Failed KOS-ECU
Failed engine-ECU

DIAGNOSIS PROCEDURE

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

Use M.U.T.-III to perform CAN bus line diagnosis.

Q. Is the check result normal?

	Go to Step 2.

	Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting - CAN Bus Diagnosis Table ). After repairing the CAN bus line, go to Step 4.

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

Confirm whether the diagnosis code is stored in the KOS-ECU.

Q. Is diagnosis code stored?

	Perform troubleshooting of KOS-ECU (Refer to GROUP 42B - Troubleshooting - Check Chart for Diagnosis Code ).

	Go to Step 3.

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

Reconfirmation of diagnosis code.

Confirm again whether the diagnosis code is stored in the engine-ECU.

Erase the stored diagnosis code.
Ignition switch: LOCK (OFF) → ON
Confirm whether the diagnosis code is stored.

Q. Is diagnosis code stored?

	After replacing the engine-ECU, go to Step 4.

	Intermittent malfunction in CAN bus line between engine-ECU and KOS-ECU (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).

STEP 4. M.U.T.-III diagnosis code

Reconfirmation of diagnosis code.

Confirm again whether the diagnosis code is stored in the engine-ECU.

Erase the stored diagnosis code.
Ignition switch: LOCK (OFF) → ON
Confirm whether the diagnosis code is stored.

Q. Is diagnosis code stored?

	Go to Step 1.

	Check end.