INSPECTION PROCEDURE 2: The ignition key cannot be registered with the M.U.T.-III.

CIRCUIT OPERATION

Refer to

COMMENTS ON TROUBLE SYMPTOM

If only some ignition keys cannot be registered, the ignition key itself may be defective. If no ignition key can be registered, the immobilizer ECU may be defective.

POSSIBLE CAUSES

Malfunction of ignition key
Damaged harness wires and connectors
Malfunction of immobilizer ECU
Malfunction of engine-ECU <M/T> or engine-A/T-ECU <A/T>

DIAGNOSTIC PROCEDURE

STEP 1. Check that no ignition key can be registered.

Q. Can any of the ignition keys be registered?

	Replace the ignition key that cannot be registered with new registered ignition key.

	Go to Step 2.

Step 2. Connector check: Key reminder switch connector C-308 and engine-ECU <M/T> or engine-A/T-ECU <A/T> connector C-112

Q. Are key reminder switch connector C-308 and engine-ECU <M/T> or engine-A/T-ECU <A/T> connector C-112 in good condition?

Go to Step 3.

Repair the defective connector.

Step 3. Check the harness wires between key reminder switch connector C-308 (terminal 7) and engine-ECU <M/T> or engine-A/T-ECU <A/T> connector C-112 (terminal 65).

note

Prior to the wiring harness inspection, check intermediate connector C-17, and repair if necessary.

Q. Are the harness wires between key reminder switch connector C-308 (terminal 7) and engine-ECU <M/T> or engine-A/T-ECU <A/T> connector C-112 (terminal 65) in good condition?

Go to Step 4.

Repair the wiring harness.

Step 4. Check the communication with M.U.T.-III

Q. Can the system communicate with the M.U.T.-III?

	Go to Step 5.

	Refer to INSPECTION PROCEDURE 1 "MPI system-related diagnostic code No.54 <except vehicles for Hong Kong and Singapore> or No.P0513 <vehicles for Hong Kong and Singapore> is set, and communication between M.U.T.-III and immobilizer cannot be established."

Step 5. M.U.T.-III diagnosis code

Check whether the engine immobilizer system-related diagnosis code is set.

Q. Is the diagnosis code set?

	Refer to .

	Go to Step 6.

Step 6. Retest the system.

Check that the ignition key can be registered.

Q. Is the check result normal?

	The procedure is complete.

	Replace the immobilizer ECU, and then go to Step 7 .

Step 7. Retest the system.

Check that the ignition key can be registered.

Q. Is the check result normal?

	The procedure is complete.

	Replace the engine-ECU <M/T> or engine-A/T-ECU <A/T>.