Starting System

This vehicle is equipped with a PATS that disables the engine from cranking and 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 causes the engine to be disabled, the IPC displays the corresponding message in the message center. For additional information, REFER to: PASSIVE ANTI-THEFT SYSTEM (PATS)

Under normal operation, when the ignition is turned to START, the PCM receives the 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 TCM (automatic transmission).
• Correct bottom of travel input from the CPP switch (manual 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 and start 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.