Before
replacing the ECU, ensure that the power supply circuit, the earth circuit and the communication
circuit are normal.
When the ETACS-ECU of vehicles without KOS is replaced, the encrypted code of the ignition
key needs to be registered to the ETACS-ECU. (If the encrypted code is not registered, the engine
cannot be started. Register the encrypted code as described in Immobilizer System -
How
to Register Key ID .)
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 electric tailgate control 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 electric tailgate control unit.
(1)Erase the diagnosis code.
(2)Turn the ignition motor switch from "LOCK" (OFF) position to "ON" position.
(3)On completion, check that the diagnosis code is reset.
Q.
Is the diagnosis code set?
Replace the ETACS-ECU. 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 electric tailgate control unit.
(1)Erase the diagnosis code.
(2)Turn the ignition motor switch from "LOCK" (OFF) position to "ON" position.
(3)On completion, check that the diagnosis code is reset.
.)
