Inspection Procedure 3: The ignition key cannot be registered with the M.U.T.-III. <Diesel powered vehicle>
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 key assembly may have already been registered for another vehicle, or the immobilizer-ECU may be defective.
PROBABLE CAUSES
- Malfunction of ignition key
- Damaged harness wires and connectors
- Malfunction of immobilizer-ECU
- Malfunction of engine-ECU
- Transponder registered for other vehicle
DIAGNOSIS PROCEDURE
STEP 1. Check the ignition key inserted in the key cylinder for interference.
Q.
Are there other ignition keys or anything that interferes with the communication (things that generate radio waves such as magnets and an air-cleaning device that has a power plug) near the ignition key inserted in the key cylinder?
Move away or remove other ignition keys or things that interfere with the communication (things that generate radio waves such as magnets and a air-cleaning device that has a power plug) near the ignition key. Then, go to step 2.
Go to Step 3.
STEP 2. Retest the system.
Check that the ignition key can be registered.
Q.
Is the check result normal?
The procedure is complete.
Go to Step 3.
STEP 3. Check which ignition key cannot be registered.
Q.
Are there only some ignition keys that cannot be registered?
Only some keys
: Replace the key that cannot be registered and register the ID codes (Refer to 
). After registering the ID codes, go to Step 5.
All keys : Go to Step 4.
STEP 4. Retest the system.
Check the M.U.T.-III screen when the key was not able to be registered.
Q.
Which error message did the M.U.T.-III display?
Defective key : Carry out the troubleshooting for diagnosis code B1722 Transponder Antenna Failure. Refer to . Then, go to Step 5.
ECU internal error : Replace the immobilizer-ECU and register the ID codes (Refer to ). After registering the ID codes, go to Step 6.
STEP 5. 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 ID codes (Refer to ). After registering the ID codes, 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 engine-ECU and register the ID codes (Refer to ).