System Operation

Starting System - without Intelligent Access (IA)

System Operation

System Diagram





Network Message Chart

Module Network Input Messages PCM (Powertrain Control Module)






Starting System

This vehicle is equipped with a PATS (Passive Anti-Theft System) that disables the engine from cranking and starting if an unprogrammed PATS (Passive Anti-Theft System) key is used or an invalid PCM (Powertrain Control Module) ID is received. The PATS (Passive Anti-Theft System) is controlled by the BCM (Body Control Module). If there is a PATS (Passive Anti-Theft System) concern that causes the engine to be disabled, the IPC (Instrument Panel Cluster) displays the corresponding message in the message center. REFER to Passive Anti-Theft System.

Under normal operation, when the ignition is turned to START, the PCM (Powertrain Control Module) receives the inputs:
- Voltage signal on the crank detect circuit from the ignition switch.
- PATS (Passive Anti-Theft System) enable message from the BCM (Body Control Module).
- Correct transmission park or neutral input from the TCM (Transmission Control Module) (automatic transmission).
- Correct bottom of travel input from the CPP (Clutch Pedal Position) switch (manual transmission).

When the PCM (Powertrain Control Module) receives the correct inputs, voltage and ground is supplied to the starter relay coil. When the starter relay coil is energized, it provides voltage to the starter solenoid, allowing the starter motor to crank and start the engine.

The PCM (Powertrain Control Module) disengages the starter once an engine RPM (Revolutions Per Minute) threshold is reached, a set crank time is exceeded or the ignition is turned OFF.