The powertrain used in this vehicle consists of a twin cam V6 engine mated to a 4T65-E electronically
controlled transaxle. The powertrain has electronic controls to reduce exhaust emissions while
maintaining excellent driveability and fuel economy. The powertrain control module (PCM) is the heart
of this control system.

The powertrain control module is designed to maintain exhaust emission levels to Federal or California
standards while providing excellent driveability and fuel efficiency. Review the components and the
wiring diagrams in order to determine which systems are controlled by the PCM. The PCM monitors
numerous engine and vehicle functions. The following are some of the functions that the PCM controls:

•  The engine fueling
•  The
ignition control (IC)
•  The knock sensor (KS) system
•  The
evaporative emissions (EVAP) system
•  The secondary air injection (AIR) system, if equipped
•  The
exhaust gas recirculation (EGR) system
•  The automatic transmission functions
•  The generator
•  The A/C clutch control
•  The cooling fan control

Powertrain Control Module Function
The PCM constantly looks at the information from various sensors and other inputs, and controls
systems that affect the vehicle performance and emissions. The PCM also performs diagnostic tests
on various parts of the system. The PCM can recognize operational problems and alert the driver via
the malfunction indicator lamp (MIL). When the PCM detects a malfunction, the module stores a
diagnostic trouble code (DTC). The problem area is identified by the particular DTC that is set. The
module supplies a buffered voltage to various sensors and switches. The input and output devices in
the control module include analog to digital converters, signal buffers, counters, and output drivers.
The output drivers are electronic switches which complete a ground circuit when turned on. Most PCM
controlled components are operated via output drivers. The PCM monitors these driver circuits for
proper operation, and in most cases can set a DTC corresponding to the controlled device if a
problem is detected.

More Auto Repair Answers, Questions And Help
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Engine Operation
2.2L  3100 / 3400 
3.5L  3800 
4200  4.3L Vortec

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3.5L V6 Engine Computer (PCM) Description