System Description
DIAGNOSIS SYSTEMDescription
1. The transponder key ECU controls the vehicle's immobilizer system functions. Immobilizer system data and the Diagnostic Trouble Codes (DTCs) can be read through the vehicle's Data Link Connector 3 (DLC3). In some cases, a malfunction may be occurring in the immobilizer system even though the security indicator is not illuminated. When the system seems to be malfunctioning, use the hand-held tester to check for malfunctions and perform repairs.