Control Module: Description and Operation

The powertrain control module (PCM) controls various engine functions and provides control of the 4R44E transmissions.

The PCM responds to inputs and operates solenoids for electro-hydraulic control of line pressure, shift scheduling, torque converter clutch (TCC) scheduling and coast clutch control for coast braking.

The PCM has the ability to:
^ Monitor its input and output devices for the presence of faults.
^ Store diagnostic trouble codes (DTCs) related to detected faults.
^ Alert the driver for some detected faults by turning on the malfunctioning indicator lamp (MIL) in the instrument cluster.
^ Display information when a service technician connects diagnostic equipment.

Diagnostic Trouble Codes: P0603, P0605.