Vehicle Anti-Theft System (VATS)

Vehicle Anti-theft System (VATS):

The Vehicle Anti-theft System or VATS (PASS-KEY) system is designed to disable vehicle operation if the incorrect key or starting procedure is used. The VATS PASS key decoder module sends a signal to the ECM, on circuit 229, if the correct key is being used. If the proper signal does not reach the ECM, the ECM will not pulse the fuel injectors "ON" and thus not allow the vehicle to start. Code 46 will set if the proper signal is not being received by the ECM when the ignition is turned on.