Code No. U1102: ABS-ECU Time-out

caution

If Diagnosis Code U1102 is output from engine-ECU <M/T> or engine-A/T-ECU <A/T> 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 10V 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-ECU <M/T> and ABS-ECU or between engine-A/T-ECU <A/T> and ABS-ECU, by malfunction in the power supply system of ABS-ECU, in ABS-ECU itself, in engine-ECU <M/T> or engine-A/T-ECU <A/T>.

Past malfunction

Focus on diagnosing malfunction of the harness and connector in CAN busline between engine-ECU <M/T> and ABS-ECU or between engine-A/T-ECU <A/T> 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 trouble, 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 GROUP 54F - Explanation About The M.U.T.-III CAN Bus Diagnostics

PROBABLE CAUSE

Failed of the harness and the connector
Failed engine-ECU <M/T>
Failed engine-A/T-ECU <A/T>
Failed ABS-ECU

DIAGNOSIS

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

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 Diagnosis Table ), 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 output?

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

	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 output?

	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-ECU <M/T> or engine-A/T-ECU <A/T>.

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

Q. Is the diagnosis code output?

	Replace ABS-ECU, go to Step 6 .

	Intermittent malfunction in CAN busline between engine-ECU <M/T> and ABS-ECU or between engine-A/T-ECU <A/T> (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-ECU <M/T> or engine-A/T-ECU <A/T>.

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

Q. Is the diagnosis code output?

	Replace engine-ECU <M/T> or engine-A/T-ECU <A/T>, go to Step 6 .

	Intermittent malfunction in CAN busline between engine-ECU <M/T> or engine-A/T-ECU <A/T> 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-ECU <M/T> or engine-A/T-ECU <A/T>.

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

Q. Is the diagnosis code output?

	Go to Step 1 .

	Check end.