CODE No. U1190 No receive fault detect signal

caution

If diagnosis code No. U1190 is set in the BSW-ECU (master), always diagnose the CAN bus line.
Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.

OPERATION

The BSW-ECU (master) communicates with the ETACS-ECU via the gateway-ECU and CAN bus lines.

DIAGNOSTIC FUNCTION AND JUDGEMENT CRITERIA

When the BSW-ECU (master) cannot receive any fault detect signal from the ETACS-ECU within 5 seconds after the ignition switch is turned on, the ECU sets diagnosis code No. U1190.

PROBABLE CAUSES

Malfunction of the ETACS-ECU
Malfunction of the BSW-ECU (master)

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 normal?

Go to Step 2.

Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting

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

Check if the diagnosis code No. U1190 is set in the gateway-ECU.

Q. Is the diagnosis code set?

Troubleshoot the gateway-ECU (Refer to 54C - Troubleshoot <GATEWAY> - Diagnosis Code Chart

Go to Step 3.

STEP 3. Check whether the diagnosis code is set again.

Check again if the diagnosis code is set in the BSW-ECU (master).

(1)Erase the diagnosis code.

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

(3)Check if diagnosis code is set.

Q. Is the diagnosis code set?

Replace the BSW-ECU (master).

Intermittent malfunction is suspected (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to cope with Intermittent Malfunction).