DESCRIPTION & OPERATION
The PASSLOCK(R) system is designed to prevent vehicle theft by disabling the engine, unless a mechanical key is used to correctly engage the PASSLOCK(R) lock cylinder. System components include ignition switch, PASSLOCK(R) lock cylinder, Powertrain Control Module (PCM) and Instrument Panel Cluster (IPC).
When mechanical key turns the PASSLOCK(R) lock cylinder, a Resistance Code (R-Code), is created by a rotating magnet turning past a stationary hall effect sensor. This signal is sent to the Instrument Panel Cluster (IPC). The IPC determines the validity of the R-Code within a preset time window, then send a coded password to the Power Control Module (PCM), which then allows the fuel injectors to operate normally.
If R-Code is not read within the preset time window, the Vehicle Theft Deterrent (VTD) system will go into SHORT TAMPER MODE. During this short tamper mode, the vehicle will not operate for 4 seconds and theft warning light will flash. After 3 consecutive failed timings, the VTD will go into LONG TAMPER MODE. During the long tamper mode, the fuel injectors will be shut off for 10 minutes and theft deterrent warning light will flash. If IPC receives the wrong R-Code, Vehicle Theft Deterrent will go into LONG TAMPER MODE. Vehicle may crank and temporarily start during tamper modes, but will soon stall due to fuel shut-off.
Monday, December 15th, 2008 AT 5:32 PM