Code No. P0513: Immobilizer Malfunction

FUNCTION

The engine-ECU transmits to and receives from KOS-ECU a control signal to authenticate the ignition key.

note

This code may be displayed due to radio interference if there are multiple registered ignition keys nearby during engine start.
This code may be displayed when the transponder ID code is registered.
This code is also displayed when the ignition key code is not recognised.
When this code is displayed, it is also sent to KOS-ECU.

TROUBLE JUDGEMENT

Check Condition

Ignition switch is "ON" position.

Judgement Criterion

When the communication error between engine-ECU and KOS-ECU continues more than 2 seconds.

or

When it was different in the encrypted code sent from KOS-ECU and operation result by engine-ECU.

FAIL-SAFE AND BACKUP FUNCTION

Engine start is prohibited.

PROBABLE CAUSES

Failed KOS-ECU
Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code

Reconfirmation whether diagnosis code is set in KOS-ECU.

Q. Is diagnosis code set?

	Perform the troubleshooting of KOS system (Refer to GROUP 42B - Troubleshooting - Check Chart for Diagnosis Code).

	Go to Step 2.

STEP 2. M.U.T.-III diagnosis code

Reconfirmation of diagnosis code.

Q. Is diagnosis code set?

	Replace the KOS-ECU. After the replacement, put the each identification code into KOS-ECU. (Refer to GROUP 42B - On-vehicle Service - ID Code Registration Procedure). Then go to Step 3.

	Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent malfunctions ).

STEP 3. M.U.T.-III diagnosis code

Reconfirmation of diagnosis code.

Q. Is diagnosis code set?

	Replace the engine-ECU.

	Check end.