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.
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.
3.5L v6 Oldsmobile aurora and Intrique engine mechanical description
