Town & Country V6-4.0L (2008)
Engine Control Module: Description and Operation
Powertrain Control Module - Operation
OPERATION
The Powertrain Control Module (PCM) receives input signals from various switches and sensors. When the ignition key is inserted and rotated to the
ACC or Run/Start position, its physical position is determined by the TIPM via a CAN message from the Wireless Ignition Node (WIN). The TIPM then
powers up the ACC and Run/Start circuits with battery voltage. Power to these circuits wakes up the PCM accordingly. When the key is rotated to the
START (crank) position the TIPM transmits the key position via the CAN C bus to the PCM. Based on inputs it receives, the PCM adjusts and controls
fuel injector pulse width, idle speed, ignition spark advance, ignition coil dwell, EVAP canister purge, cooling fan, and air conditioning.
PCM SENSOR INPUTS
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A/C Request & A/C Select Signal via CAN C bus
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ASD relay voltage sense 11. Trans (EATX) relay voltage sense
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Alternator B+ Sense Signal
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Battery voltage
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Brake Switch Inputs 1 & 2
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Camshaft Position Sensor
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Crankshaft Position Sensor
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EGR position sensor signal 3. Transmission Pressure Switches
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Engine Coolant Temperature Sensor
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ERS (electronic range select) Up & Down Input
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EVAP Purge Solenoid Sense
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Ignition Run/Start hard wire feed from TIPM
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Ignition ACC hard wire feed from TIPM
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Ignition START via CAN C from TIPM
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Intake Air Temperature Sensor
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CAN-C
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ESIM Vacuum Switch
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Manifold Absolute Pressure (MAP) Sensor
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Knock Sensors
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Oil Pressure
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Oil Temperature Switch
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Oxygen Sensors Signals
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Pedal Value Sensors #1 & #2
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Speed Control MUX Inputs #1 & #2
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SRV position sensor signal (if equipped)
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Starter Signal
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Throttle Position Sensors #1 & #2
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Transmission Input Turbine Speed Sensor Signal
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Transmission Intermediate Turbine Speed Sensor Signal (62TE only)
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Transmission Output Turbine Speed Sensor Signal
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Transmission Temperature Sensor 9. Gear Position (PRNDL) Switch inputs
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Variable Line Pressure sensor signal
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Vehicle Speed via CAN C bus from ABS module
ENGINE IDLE SPEED
The PCM adjusts engine idle speed through the electronic throttle bodies based on the following inputs:
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Air Conditioning Signal
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Battery Voltage
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Coolant Temperature
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Engine Speed (Crankshaft Position Sensor)
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Engine Run Time
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Manifold Absolute Pressure
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Mass Airflow Sensor
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Throttle position Sensors and Pedal Value Sensors
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Vehicle distance (Speed)
FUEL INJECTOR PULSE WIDTH
The PCM adjusts fuel injector pulse width (air-fuel ratio) based on the following inputs:
