Starting System

This vehicle is equipped with a PATS  that disables the engine from starting if an unprogrammed PATS  key is used or an invalid PCM  ID is received. The PATS  is controlled by the BCM  . If there is a PATS  concern that disables the engine, the IPC  displays the corresponding message in the message center.

Refer to: PASSIVE ANTI-THEFT SYSTEM (PATS) - SYSTEM OPERATION AND COMPONENT DESCRIPTION .

The starting system controls the cranking of the engine. Under normal operation, when the ignition is turned to START, the PCM  receives the following inputs:

• Voltage signal on the crank detect circuit from the ignition switch
• PATS  enable message from the BCM 
• Correct transmission park or neutral input from the automatic transmission

When the PCM  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 the engine.

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