PT Cruiser L4-2.4L (2008)
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Auto Shutdown (ASD) Relay
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Charging Indicator Lamp (Bus Message)
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Proportional Purge Solenoid
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EGR Solenoid
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Fuel Injectors
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Fuel Pump Relay
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Generator Field
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Idle Air Control Motor (2.4L)
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Ignition Coils
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CAN C Bus (2.4L)
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Malfunction Indicator (Check Engine) Lamp (Bus Message)
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Oxygen Sensors Heater Controls
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Radiator Fan Relays
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Speed Control Solenoids (2.4L)
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Transmission Control Relay
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Transmission Solenoids (LR/CC, 2/4, OD, and UD)
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Transmission PRNDL Position (to Cluster)
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Transmission Torque Reduction Request (Internal to PCM)
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Transmission Temperature (Internal to PCM and a Bus Message)
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Vehicle Speed (Manual Transmission)
Based on inputs it receives, the PCM adjusts fuel injector pulse width, idle speed, ignition spark advance, ignition coil dwell and EVAP canister purge
operation. The PCM also determines the appropriate transmission shift schedule and shift points, depending on the present operating conditions and
driver demand. The PCM regulates the cooling fan, air conditioning and speed control systems. The PCM changes generator charge rate by adjusting the
generator field. The PCM also performs diagnostics.
The PCM adjusts injector pulse width (air-fuel ratio) based on the following inputs.
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Battery voltage
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Coolant temperature
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Exhaust gas content (oxygen sensor)
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Engine speed (crankshaft position sensor)
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Intake air temperature
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Manifold absolute pressure
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Throttle position
The PCM adjusts ignition timing based on the following inputs.
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Coolant temperature
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Engine speed (crankshaft position sensor)
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Knock sensor
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Manifold absolute pressure
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Throttle position
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Transmission gear selection (park/neutral switch)
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Intake air temperature
The PCM also adjusts engine idle speed through the idle air control motor based on the following inputs.
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Air conditioning sense
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Battery voltage
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Battery temperature
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Brake switch
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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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Power steering pressure switch
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Throttle position
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Transmission gear selection (park/neutral switch)
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Vehicle distance (speed)
The camshaft position sensor and crankshaft position sensor signals are sent to the PCM. If the PCM does not receive the signal within approximately 1
second of engine cranking, it deactivates the ASD relay and fuel pump control. When the relay/control is deactivated, power is shut off from the fuel
injectors, ignition coils, oxygen sensor heating elements and fuel pump.
The PCM contains a voltage converter that changes battery voltage to a regulated 5 volts direct current to power the camshaft position sensor, crankshaft
