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11A-30 IMMOBILIZER SYSTEM (C24SE, 4JA1-T) IMMOBILIZER SYSTEM CHECK Step Action Value(s) Yes No 1 1. Key position is "ON," engine "OFF." 2. Observe the check engine lamp. Note: When a key switch is turned ON, check engine Is the check engine lamp "ON"? Go to Step 2 Go to "No Immobilizer warning lamp" 2 1. Key position is "ON," engine "OFF." 2. Observe the check engine lamp. Note: When a key switch is turned ON, check engine Is the check engine lamp "OFF"? (Check engine lamp does not flash) Go to Step 3 Go to "Immobilizer warning lamp on steady" 3 1. Key position is "OFF." 2. Install a scan tool. 3. Key position is "ON." 4. Attempt to display immobilizer data with the scan tool. Does the scan tool display immobilizer data? Go to Step 9 Go to Step 4 4 1. Key position is "OFF," disconnect the immobilizer control unit (ICU). 2. Check the DLC (Data Link Connector) circuit for an open, short to ground, or short to voltage. Also, check the DLC ignition feed circuit for an open or short to ground and the DLC ground circuit for an open. Was a problem found? Go to Step 5 Go to Step 6 5 Repair or replace the DLC (Data Link Connector) Was the action complete? Go to Step 3 6 1. Check the ICU circuit for an open, short to ground, or short to voltage. Also, check the ICU ignition feed circuit for an open or short to ground and the ICU ground circuit for an open. 2. If a problem is found, repair as necessary. Was a problem found? Go to Step 7 Go to Step 8 7 Repair or replace the ICU ignition feed and ground Was the action complete? Go to Step 3 8 Replace the immobilizer control unit (ICU). IMPORTANT: The replacement ICU must be programmed the immobilizer data by the scan tool. Was the action complete? Go to Step 3 9 Select "Display DTCs" with the scan tool. Are any DTCs stored? Go to Step 10 Go to Step 13 |