If diagnosis
code No. U1005 is set to the ETACS-ECU, always diagnose the CAN 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 the signal from corner sensor/back sensor-ECU cannot be received, the ETACS-ECU sets
the diagnosis code No. U1005.
JUDGEMENT CRITERIA
After the following statuses continue to be true for 5 seconds, if the communication with
the corner sensor/back sensor-ECU cannot be established for 600 ms or more, the 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 10-16 V.
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 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 to the corner sensor/back sensor-ECU.
Q.
Is the diagnosis code set?
Perform troubleshooting for the corner sensor/back sensor-ECU. (Refer to .)
Go to Step 3.
STEP 3. Check whether the diagnosis code is reset.
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 corner sensor/back sensor-ECU. Go to Step 4.
A poor connection, open circuit, or other intermittent malfunction in the CAN
bus line between the corner sensor/back sensor-ECU and ETACS-ECU. (Refer to GROUP 00 - How
to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction .)
STEP 4. Check whether the diagnosis code is reset.
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 corner sensor/back sensor-ECU and ETACS-ECU. (Refer to GROUP 00 - How
to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction .)