4.2L inline 6 cylinder electronic control system
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.
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.
