If diagnosis
code No. U0245 is set, be sure to diagnose the CAN bus line.
When replacing the ECU, always check that the communication circuit is normal.
DIAGNOSTIC FUNCTION
If the signal from MMCS cannot be received, the electric tailgate control unit sets diagnosis
code No. U0184.
JUDGMENT CRITERIA
With the statuses that the ignition switch is at ON position, system voltage is 10 to
16 V (data from ETACS-ECU), and there is no malfunction to the power supply fuse, or odometer
value is 80.5 km or more, if the communication with MMCS cannot be established for 2,500 ms
or more, the electric tailgate control unit determines that a problem has occurred.
PROBABLE CAUSES
Malfunction of MMCS
Malfunction of the electric tailgate control unit
Malfunction of CAN bus line
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. M.U.T.-III diagnosis code for other systems
Check that MMCS sets a diagnosis code.
Q.
Is the diagnosis code set?
Diagnose the MMCS. (Refer to GROUP 54A - Diagnosis Code Chart .)
Go to Step 3.
STEP 3. M.U.T.-III other system diagnosis code
Check if the diagnosis code No. U0245 is set to the KOS-ECU, OSS-ECU, combination meter,
ETACS-ECU or A/C-ECU.
Q.
Is the diagnosis code set?
Go to Step 4.
Go to Step 5.
STEP 4. Check whether the diagnosis code is reset.
Check again if the electric tailgate control unit sets a diagnosis code.
(1)Erase the diagnosis code.
(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(3)Check if diagnosis code is set.
Q.
Is the diagnosis code set?
Replace the MMCS.
An intermittent malfunction may be present. (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.
Check again if the electric tailgate control unit sets a diagnosis code.
(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.
An intermittent malfunction may be present. (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 
.)