The powertrain has electronic controls to reduce exhaust emissions while maintaining excellent
driveability and fuel economy. The powertrain control module (PCM) is the control center of this
system. The PCM monitors numerous engine and vehicle functions. The PCM constantly looks at the
information from various sensors and other inputs, and controls the systems that affect vehicle
performance and emissions. The PCM also performs the 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. Review the components and wiring diagrams in order to
determine which systems are controlled by the PCM.

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

4.2 L in-line 6 cylinder engine sensor locations.


Powertrain Control Module Function
The powertrain control module (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.
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4.2L Engine Computer (PCM) Description