Inspection Procedure 3: The ignition key cannot be registered with the M.U.T.-III. <3800>














CIRCUIT OPERATION



COMMENTS ON TROUBLE SYMPTOM



PROBABLE CAUSES



  • Malfunction of ignition key
  • Damaged harness wires and connectors
  • Malfunction of immobilizer-ECU
  • Malfunction of engine-A/T-ECU

DIAGNOSIS 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: D-310 key reminder switch connector and D-216 engine-A/T-ECU connector

Q. Is the check result normal?
Go to Step 3.
Repair the defective connector.

STEP 3. Check the harness wires between D-310 key reminder switch connector terminal No.7 and D-216 engine-A/T-ECU connector terminal No.65.
note Prior to the wiring harness inspection, check intermediate connector D-229, and repair if necessary.

Q. Is the check result normal?
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.P0513 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 register the ignition key (Refer to ). 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-A/T-ECU and register the ignition key (Refer to ).