Initial Inspection and Diagnostic Overview

Immobilizer Control System Check

1. Immobilizer indicator light ON check

Turn ignition switch to ON position using ignition key.

Does immobilizer indicator light come on?
YES -
Go to Step 2.
NO -
Go to Immobilizer Indicator Light Does Not Come ON with Ignition Switch ON and Engine Stop Immobilizer Indicator Light Does Not Come ON with Ignition Switch ON and Engine Stop.

2. DTC check

Check ECM for DTC referring to DTC Check DTC Check

Is DTC P1636 or P1638 detected?
YES -
Go to applicable DTC diag. flow.
NO -
Go to Step 3.

3. Immobilizer indicator light flash check

Does immobilizer indicator light flash on and off continuously in Step 1?
YES -
Check what DTC is detected by ECM referring to DTC Check DTC Check. Then, perform the troubleshooting referring to the corresponding flowchart in this section.
NO -
Go to Step 4.

4. Engine start check

Start engine using ignition key.

Does engine start?
YES -
Go to Step 5.
NO -
Perform Engine and Emission Control System Check Engine and Emission Control System Check.

5. Immobilizer indicator light remain ON check

Check if immobilizer indicator light remains ON after engine start.

Does immobilizer indicator light remain ON after engine start?
YES -
Go to Immobilizer Indicator Light Remains ON after Engine Start Immobilizer Indicator Light Remains ON after Engine Start.
NO -
Immobilizer control system is in good condition. Then, go to Keyless Start System Check Keyless Start System Check
for the vehicle with keyless start system.