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
When the left wiring harness of turn-signal lamp is short circuited, the ETACS-ECU sets
diagnosis code No. B16A3.
JUDGEMENT CRITERIA
With the diagnosis code not set, when the short circuit is detected three times consecutively,
the ETACS-ECU sets the diagnosis code No. B16A3.
PROBABLE CAUSES
Damaged harness wires and connectors
Malfunction of the ETACS-ECU
DIAGNOSIS PROCEDURE
STEP 1. Check of short circuit in TL1&TL2-1 line between
ETACS-ECU connector and headlamp assembly (TURN: LH) connector
Q.
Is the check result normal?
Go to Step 2.
Repair the connector(s) or wiring harness.
STEP 2. Check of short circuit in TL1&TL2-1 line between
ETACS-ECU connector and side turn-signal lamp (LH) connector <Fender panel attachment type>
Q.
Is the check result normal?
Go to Step 3.
Repair the connector(s) or wiring harness.
STEP 3. Check of short circuit in TL3-1&TL3-2 line between
ETACS-ECU connector and rear combination lamp (TURN: LH) connector
Q.
Is the check result normal?
Go to Step 4.
Repair the connector(s) or wiring harness.
STEP 4. Check of short circuit in TL2-2 line between ETACS-ECU connector
and side turn-signal lamp (LH) connector <Integrated in door mirror type>
Q.
Is the check result normal?
Go to Step 5.
Repair the connector(s) or wiring harness.
STEP 5. Check whether the diagnosis code is reset.
(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 ETACS-ECU.
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
.)
Repair the connector(s) or wiring harness.