If the diagnosis
code No. U1005 is set, be sure to diagnose the CAN bus line.
Before replacing the ECU or combination meter, 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 .)
TROUBLE JUDGEMENT
If signal from the corner sensor/back sensor-ECU cannot be received for 500 milliseconds
or more, the ETACS-ECU sets diagnosis code No. U1005.
PROBABLE CAUSES
Malfunction of the corner sensor/back sensor-ECU
Malfunction of the ETACS-ECU
Malfunction of the CAN bus
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 5.
STEP 2. Check the M.U.T.-III Diagnosis code for other systems
Check that the corner sensor/back sensor-ECU set a diagnosis code.
Q.
Is the diagnosis code set?
Diagnose the corner sensor/back sensor-ECU. (Refer to .)
Go to Step 3.
STEP 3. M.U.T.-III other system diagnosis code
Check if a diagnosis code, which relates to CAN communication-linked systems below, is
set.
ETACS-ECU
Code No. U1005: Corner/Back SNS.ECU CAN timeout
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 diagnosis code is set to the ETACS-ECU.
(1)Erase the diagnosis code.
(2)Turn the ignition 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 corner sensor/back sensor-ECU. After replacing the ECU, carry out
the CAN bus diagnostics. Then go to Step 6.
A poor connection, open circuit or other intermittent malfunction is present in
the CAN bus lines between the corner sensor/back sensor-ECU and the ETACS-ECU (Refer to GROUP
00, How to Use Troubleshooting/Inspection Service Points - How to Cope with
Intermittent Malfunctions ).
STEP 5. Check whether the diagnosis code is reset.
Check again if the diagnosis code is set to the ETACS-ECU.
(1)Erase the diagnosis code.
(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(3)On completion, check that the diagnosis code is not reset.
Q.
Is the diagnosis code set?
Replace the ETACS-ECU. After replacing the ECU, carry out the CAN bus diagnostics.
Then go to Step 6.
A poor connection, open circuit or other intermittent malfunction is present in
the CAN bus lines between the corner sensor/back sensor-ECU and the ETACS-ECU (Refer to GROUP
00, How to Use Troubleshooting/Inspection Service Points - How to Cope with
Intermittent Malfunctions ).
STEP 6. Check whether the diagnosis code is reset.
Recheck if the diagnosis code is set to the ETACS-ECU.
(1)Erase the diagnosis code.
(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(3)On completion, check that the diagnosis code is reset.
.)
