When an ignition key is inserted into the ignition lock cylinder and the ignition is switched ON, the transponder embedded in the head of the key is energized by the exciter coils surrounding the ignition lock cylinder. The energized transponder transmits a signal that contains its unique value, which is received by the theft deterrent module (TDM). The TDM then compares this value to a value stored in memory. This stored value is the learned key code. If the value is correct, the TDM will send the fuel continue password via the serial data circuit to the engine control module (ECM). If the learned key code does not match or a transponder value is not received, the TDM will send the start disable password to the ECM.

Ignition is in the Accessory or Run position.

The TDM is unable to measure the ignition key transponder value.

Schematic Reference

Immobilizer Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Immobilizer Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

Important: When using this diagnostic, more than one vehicle key is required to ensure proper diagnosis. If more than one key is not available at the time of service, contact the customer and ask if any other keys can be provided for service. If unavailable, a new second key can be created.

1. Inspect all available vehicle keys that they are correct vehicle keys .

⇒	If not a correct vehicle key, replace the key.

2. While viewing the scan tool VTD States parameter, turn ON the ignition with each of the available vehicle keys. The parameter should read Normal Decision with all available keys.

⇒	If only one key results in the parameter reading No Coded Key, replace the appropriate key.

⇒	If all available keys result in the parameter reading No Coded Key, replace the TDM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.