Code No. U1190: No receive fault detect signal

caution

If the diagnosis code No. U1190 is set, diagnose the CAN bus lines.
When replacing the ECU, always check that the SRS circuit is normal.

TROUBLE JUDGEMENT

ETACS-ECU sends the diagnosis code (U code) detection permission or prohibition signal to each ECU connected to the CAN-C-Mid bus line. If the SRS-ECU cannot receive the diagnosis code (U code) detection permission or prohibition signal for 5 seconds after turning the ignition switch to the ON position, diagnosis code U1190 will be set.

PROBABLE CAUSES

Malfunction of CAN bus line
Malfunction of SRS-ECU
Malfunction of the ETACS-ECU

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 again if the diagnosis code is set to the ETACS-ECU.

Q. Is the diagnosis code set?

	Diagnose the ETACS-ECU (Refer to GROUP 54A, Troubleshooting ).

	Go to Step 3

STEP 3. Diagnosis code recheck

Check again if the diagnosis code is set to the SRS-ECU.

(1)Erase the diagnosis code.

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

(3)Check if the diagnosis code is set.

Q. Is the diagnosis code set?

	Replace the ETACS-ECU. After replacing the ECU, carry out the CAN bus diagnostics. Then go to Step 4.

	A poor connection, open circuit or other intermittent malfunction in the CAN bus line between the ETACS-ECU and the SRS-ECU. (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction .)

STEP 4. Diagnosis code recheck

Check again if the diagnosis code is set to the SRS-ECU.

(1)Erase the diagnosis code.

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

(3)Check if the diagnosis code is set.

Q. Is the diagnosis code set?

	Replace the SRS-ECU. After replacing the ECU, carry out the CAN bus diagnostics. Then go to Step 5.

	A poor connection, open circuit or other intermittent malfunction in the CAN bus line between the SRS-ECU and the ETACS-ECU. (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction .)

STEP 5. Check whether the diagnosis code is reset.

Recheck if the diagnosis code is set to the SRS-ECU.

(1)Erase the diagnosis code.

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

(3)On completion, check that the diagnosis code is reset.

Q. Is the diagnosis code set?

	Return to Step 1.

	The procedure is complete.