Code No.U1190 No receive fault detect signal


caution Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communication circuit are 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 CAN box unit cannot receive the diagnosis code (U code) detection permission or prohibition signal for 5 seconds after turning the electric motor switch to ON position, diagnosis code U1190 will be set.

PROBABLE CAUSES

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

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 ). On completion, go to Step 3.

STEP 2. Check whether the diagnosis code is reset.
Check again if the diagnosis code is set to the CAN box unit.
(1)Erase the diagnosis code.
(2)Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
(3)On completion, check that the diagnosis code is reset.

Q. Is the diagnosis code set?
Replace the ETACS-ECU. (Refer to GROUP 54A - ETACS .) Then go to Step 3.
The procedure is complete.

STEP 3. Check whether the diagnosis code is reset.
Recheck if the diagnosis code is set to the CAN box unit.
(1)Erase the diagnosis code.
(2)Turn the ignition switch from the "LOCK" (OFF) position to the "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.