Description of On-Board Diagnostics

DIAGNOSIS SYSTEM

The ECM 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 lamp is not illuminated. When the system seems to be malfunctioning, use the hand-held tester to check for malfunctions and perform repairs.