Diagnosis - 4L60-E: Operation: Pcm

The PCM is located under air cleaner on Brougham, Caprice and Roadmaster; at right rear corner of engine compartment on Camaro and Firebird, and above power brake booster on Corvette. The PCM is located behind glove box on all light duty truck vehicles except "G" Series. On "G" Series, PCM is under driver's seat.

PCM controls TCC, pressure control solenoid (hydraulic pressure) and shifting solenoids 1-2 and 2-3. In addition, PCM also controls ignition, fuel and emission devices related to the engine.

The PCM receives electronic signals from sensors and switches. These signals help the PCM determine when to operate various relays and solenoids related to engine and transmission components.