If diagnosis
code No.U0230 is set in the ETACS-ECU, always diagnose the CAN main bus line.
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 .)
DIAGNOSTIC FUNCTION
If no signal from the electric tailgate control unit can be received, ETACS-ECU sets diagnosis
code No. U0230.
JUDGEMENT CRITERIA
After the following statuses continue for 5 seconds, if the communication with the electric
tailgate control unit cannot be established for 2,500 ms or more, ETACS-ECU determines that
a problem has occurred.
No abnormality is present to the network.
Ignition switch is in the ON position.
No abnormality is present to the power supply fuse (IOD fuse), or the odometer value
is at 80.5 km or more.
ETACS-ECU system voltage is at 10 to 16 V.
PROBABLE CAUSES
Malfunction of the electric tailgate control unit
Malfunction of ETACS-ECU
Damaged wiring harness and connectors
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.
Q.
Is the check result normal?
Go to Step 2.
Repair the CAN bus lines. (Refer to GROUP 54C - Troubleshooting .)
STEP 2. Check the M.U.T.-III Diagnosis code for other systems
Check if a diagnosis code is set in the electric tailgate control unit.
Q.
Is the diagnosis code set?
Diagnose the electric tailgate control system. (Refer to GROUP 42A - Troubleshooting )
Go to Step 3.
STEP 3. Check the M.U.T.-III Diagnosis code for other systems
Check if diagnosis code No. U0230 is set to A/C-ECU.
Q.
Is the diagnosis code set?
Go to Step 4.
Go to Step 5.
STEP 4. Diagnosis code recheck
Check again if the diagnosis code is set to ETACS-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 electric tailgate control unit.
A poor connection, open circuit or other intermittent malfunction in the CAN bus
line between the electric tailgate control unit and the ETACS-ECU. (Refer to GROUP 00 - How
to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction .)
STEP 5. Diagnosis code recheck
Check again if the diagnosis code is set to ETACS-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.
A poor connection, open circuit or other intermittent malfunction in the CAN bus
line between the electric tailgate control unit and the ETACS-ECU. (Refer to GROUP 00 - How
to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction .)
.)
Repair the CAN bus lines. (Refer to GROUP 54C - Troubleshooting