Code No. B1762 IOD fuse not seated fully

caution

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 .)

TROUBLE JUDGMENT

When voltage at the power supply fuse (fuse No. BF3) drops below 5 V with the ignition switch ON and then the ACC OFF signal is detected for 5 seconds, the ETACS-ECU will store diagnosis code No. B1762.

PROBABLE CAUSES

Malfunction of fuse No. BF3
Malfunction of the ETACS-ECU
Malfunction of the OSS-ECU <Vehicles with one touch start system>
Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Check the power supply fuses (fuse No. BF3)

Check the power supply fuses (fuse No. BF3). (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - Inspection Service Points for a Blown Fuse

Q. Is the fuse in good condition?

Go to Step 2

Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - Inspection Service Points for a Blown Fuse

. Then go to Step 5.

STEP 2. Check of short to power supply, short to earth, and open circuit in IODI line between fusible link and ETACS-ECU connector

Q. Is the check result normal?

	YES <vehicles with one touch start system> : Go to Step 3

	YES <vehicles without one touch start system> : Go to Step 4

	NO : Repair the connector(s) or wiring harness. Then go to Step 5.

STEP 3. Check the M.U.T.-III Diagnosis code for other systems

Check that the OSS-ECU set a diagnosis code.

Q. Is the diagnosis code set?

	Diagnose the OSS-ECU. Refer to GROUP 42B, Troubleshooting .

	Go to Step 4

STEP 4. Check of short to power supply, short to earth, and open circuit in ACC line between ignition switch (ACC) <vehicles without one touch start system>or OSS-ECU (ACC) <vehicles with one touch start system> and ETACS-ECU connector

Q. Is the check result normal?

	Go to Step 5

	Repair the connector(s) or wiring harness. Then go to Step 5.

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)Check if diagnosis code is set.

Q. Is the diagnosis code set?

	Replace the ETACS-ECU.

	If the trouble symptom is resolved, an intermittent malfunction such as poorly engaged connector(s) or wiring harness is suspected. (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction .)