The powertrain control module (PCM) is the control center of the vehicle. It controls the following items:

It constantly looks at the information from various sensors, and controls the systems that affect vehicle performance. The PCM also performs the diagnostic function of the system. It can recognize operational problems, alert the driver through the MIL, and store diagnostic trouble codes which identify the problem areas to aid the technician in making repairs.

The type of PCM used is a PCM 32U. The knock sensor module is no longer a separate component. The PCM contains integrated knock sensor (KS) diagnostic circuitry. For more information on the integrated KS circuitry, Refer to DTC P0325 Knock Sensor (KS) Circuit .