Before replacing the ECU, ensure that the power supply circuit, the ground 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 hazard warning light fuse is blown, the ETACS-ECU sets DTC No. B16A6.
TROUBLE JUDGMENT
With the DTC not set, when the blown fuse of hazard warning light is detected three times consecutively, the ETACS-ECU sets DTC No. B16A3.
TROUBLESHOOTING HINTS
The ETACS-ECU may be defective
The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector
DIAGNOSIS
STEP 1. Fuse check.
Check if the turn-signal light fuse is normal.
Is the check result normal?
Go to Step 2.
Replace the turn-signal light fuse.
STEP 2. Using scan tool (M.U.T.-III), Check whether the diagnostic trouble code is set again.
(1)
caution
To prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-III).
Connect scan tool (M.U.T.-III). Refer to "How to connect Scan Tool (M.U.T.-III) ."
(2) Erase the DTC.
(3) Turn the ignition switch from "LOCK" (OFF) position to "ON" position.