Code No. U1102: ABS-ECU Time-out

caution

If diagnosis code U1102 is output from engine-A/T-ECU, surely perform CAN busline diagnosis.

caution

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

TROUBLE JUDGMENT

Check Conditions

While the cranking switch is in OFF position, or when 3 seconds pass after the cranking switch is in OFF from ON.
The battery voltage is 10 V or more.

Judgment Criterion

The signals cannot be received from ABS-ECU through CAN busline.

COMMENT ON TROUBLE SYMPTOM

Current malfunction

The failure is possibly caused by malfunction of the harness and connector in CAN busline between engine-A/T-ECU and ABS-ECU, by malfunction in the power supply system of ABS-ECU, in ABS-ECU itself, in engine-A/T-ECU.

Past malfunction

Focus on diagnosing malfunction of the harness and connector in CAN busline between engine-A/T-ECU and ABS-ECU as well as malfunction in the power supply system of ABS-ECU (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points

note

In case of Past malfunction, M.U.T.-III CAN bus diagnosis cannot detect the failure even if there is malfunction in CAN bus, so that check CAN busline in the same way as Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points

). The diagnosis codes being output to each ECU with CAN communication can narrow down the most suspected area. (Refer to GROUP54F - Diagnosis - CAN Bus Diagnostic Chart

PROBABLE CAUSE

Failed harness and connector in CAN busline
Failed engine-A/T-ECU
Failed ABS-ECU

DIAGNOSIS

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

Using M.U.T.-III, perform CAN busline diagnosis.

Q. Is the check result normal?

	Go to Step 2 .

	Correct CAN busline (Refer to GROUP54F - Diagnosis - CAN Bus Diagnostic Chart), and then go to Step 6 .

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

Confirm whether the diagnosis codes are output from ABS-ECU.

Q. Is the diagnosis code set?

	Perform the troubleshooting of ABS (Refer to GROUP 35B - Inspection Chart For Diagnosis Code ).

	Go to Step 3 .

STEP 3. M.U.T.-III other system diagnosis codes

Confirm whether Diagnosis Code U1102: ABS-ECU time-out is output from the following ECU having CAN communication with ABS-ECU

EPS-ECU
Combination meter-ECU

Q. Is the diagnosis code set?

	Go to Step 4 .

	Go to Step 5 .

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

Reconfirm whether the diagnosis code is output from engine-A/T-ECU.

Erase the diagnosis code being output.
Ignition switch: LOCK (OFF) to ON
Confirm whether the diagnosis code is output.

Q. Is the diagnosis code set?

	Replace ABS-ECU, then go to Step 6 .

	Intermittent malfunction in CAN busline between engine-A/T-ECU and ABS-ECU (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points ).

STEP 5. M.U.T.-III diagnosis code

Reconfirm whether the diagnosis code is output from engine-A/T-ECU.

Erase the diagnosis code being output.
Ignition switch: LOCK (OFF) to ON
Confirm whether the diagnosis code is output.

Q. Is the diagnosis code set?

	Replace engine-A/T-ECU, then go to Step 6 .

	Intermittent malfunction in CAN busline between engine-A/T-ECU and ABS-ECU (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points ).

STEP 6. M.U.T.-III diagnosis code

Reconfirm whether the diagnosis code is output from engine-A/T-ECU.

Erase the diagnosis code being output.
Ignition switch: LOCK (OFF) to ON
Confirm whether the diagnosis code is output.

Q. Is the diagnosis code set?

	Go to Step 1 .

	Check end.