Powertrain Control Module (Pcm)

Passive anti-theft system communicates with PCM through the instrument cluster to enable or disable vehicle's engine. Within one second after engine start, PCM must receive an enable signal from instrument cluster or engine will be disabled. Along with enable signals, instrument cluster and PCM share messages that confirm security codes shared during initial installation. This shared security data makes instrument cluster and PCM a matched pair, so neither will operate in another vehicle.

When system is functioning properly and ignition switch is turned to RUN or START position, THEFT indicator will turn on for 3 seconds, then turn off. Vehicle will be enabled to start and run.

If there is a problem in the system, THEFT indicator will stay on or flash continuously. Go to SELF-DIAGNOSTIC SYSTEM  .