Avenger V6-2.7L (2008)
rate by adjusting the generator field.
The PCM adjusts injector pulse width (air-fuel ratio) based on the following inputs.
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Manifold Absolute Pressure
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Engine Speed (crankshaft position sensor)
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Battery Voltage
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Inlet Air Temperature Sensor
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Engine Coolant Temperature
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Exhaust Gas Oxygen Content (heated oxygen sensors)
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Throttle Position
The PCM adjusts engine idle speed through the idle air control motor based on the following inputs.
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Brake Switch
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Engine Coolant Temperature
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Engine Speed (crankshaft position sensor)
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Park/Neutral
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Transaxle Gear Engagement
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Throttle Position
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Vehicle Speed (from Transmission Control Module)
The PCM adjusts ignition timing based on the following inputs.
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Inlet Air Temperature
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Engine 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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Park/Neutral (from trans range sensor)
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Transaxle Gear Engagement
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Throttle Position
The camshaft and crankshaft signals are sent to the Powertrain Control Module (PCM). If the PCM does not receive both signals within approximately
one second of engine cranking, it deactivates the fuel pump. When deactivated, power is shut off to the fuel injectors, ignition coils, fuel pump and the
heating element in each oxygen sensor.
The PCM contains a voltage converter that changes battery voltage to a regulated 5.0 volts. The 5.0 volts power the camshaft position sensor, and
crankshaft position sensor. The PCM also provides a regulated 5.0 volts supply for the, manifold absolute pressure sensor, throttle position sensor and
EGR (if equipped).
The PCM engine control strategy prevents reduced idle speeds until after the engine operates for 320 km (200 miles). If the PCM is replaced after 320
km (200 miles) of usage, update the mileage in new PCM. Use the scan tool to change the mileage in the PCM. If equipped with SKREEM, must use
SKREEM function to program VIN number in new PCM.
TRANSMISSION CONTROL
CVI CALCULATION
An important function of the PCM is to monitor Clutch Volume Index (CVI). CVIs represent the volume of fluid needed to compress a clutch pack.
The PCM monitors gear ratio changes by monitoring the Input and Output Speed Sensors. The Input, or Turbine Speed Sensor sends an electrical signal
to the PCM that represents input shaft rpm. The Output Speed Sensor provides the PCM with output shaft speed information.
By comparing the two inputs, the PCM can determine transaxle gear ratio. This is important to the CVI calculation because the PCM determines CVIs by
monitoring how long it takes for a gear change to occur.
