SRT-4 L4-2.4L Turbo VIN S (2004)
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 Auto Shutdown (ASD) and fuel pump relays are located in the Power Distribution Center (PDC).
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 relay. When these relays are 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
position sensor, manifold absolute pressure sensor, throttle position sensor, A/C pressure switch, A/C pressure transducer, and vehicle speed sensor.
Powertrain Control Module Connectors
The PCM is an engine and transmission controller module all in one, if the vehicle is equipped with an automatic transmission. The PCM uses four
wiring harness connectors to receive and send engine and transmission data. To ease assembly, the mating wiring harness connector is color-coded. Each
module connector cavity has its own unique color identification stripe located on the outside of each connector cavity.
The PCM module utilizes four wiring harness connectors as described:
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Connector Cavity A is for Power & Ground (Black)
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Connector Cavity B is for Engine Side (Orange)
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Connector Cavity C is for Headlamp & Dash (White)
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Connector Cavity D is for Transmission (Green) If equipped
NOTE: Connector Cavities A, B, C, And D must be connected prior to battery connection and ignition key on to avoid setting erroneous controller fault
codes. It is also recommended that cavity A connector is made prior to any other connectors.
TRANSMISSION CONTROL
CLUTCH VOLUME INDEX (CM)
An important function of the PCM is to monitor Transmission Clutch Volume Index (CM). CMs 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.
