Code No.U1190 No receive fault detect signal


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

JUDGEMENT CRITERIA


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

PROBABLE CAUSES



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 ).

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


Check again if the diagnosis code is set in the ETACS-ECU.

Q. Is the diagnosis code set?

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

Go to Step 3.

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


Check again if the diagnosis code is set in the A/C-ECU.

Q. Is the diagnosis code set?

Replace the ETACS-ECU (Refer to GROUP 54A - ETACS ).

Go to Step 4.

STEP 4. Diagnosis code recheck


Check again if the diagnosis code is set in the gateway-ECU.
(1)Erase the diagnosis code.
(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(3)Check if the diagnosis code is set.

Q. Is the diagnosis code set?

Replace the gateway-ECU (Refer to ).

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