The PCM is designed to maintain exhaust emission levels to Federal/California/other standards
while providing excellent Driveability and fuel efficiency. Review the components and 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
•  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 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 PCM stores a
diagnostic trouble code (DTC). The problem area is identified by the particular DTC that is set. The
control module supplies a buffered voltage to various sensors and switches. The input and output
devices in the PCM include analog-to-digital converters, signal buffers, counters, and output
drivers. The output drivers are electronic switches that complete a ground or voltage 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.

How to scan for computer trouble codes
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Powertrain Computer Operation And Description