Dakota 4WD V6-3.9L VIN X (1997)
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Transmission temperature lamp (if equipped)
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Transmission variable force solenoid
The powertrain control module (PCM) contains a voltage convertor. This converts battery voltage to a regulated 5.0 volts. It is used to power the
crankshaft position sensor, camshaft position sensor and vehicle speed sensor. The PCM also provides a five (5) volt supply for the manifold
absolute pressure (MAP) sensor and throttle position sensor (TPS).
SPEED CONTROL SYSTEM OPERATION
The speed control electronic control circuitry is integrated into the Powertrain Control Module (PCM). The PCM is located in the engine
compartment. The PCM speed control functions are monitored by the On-Board Diagnostics (OBD). All OBD-sensed systems are monitored by
the PCM. Each monitored circuit is assigned a Diagnostic Trouble Code (DTC). The PCM will store a DTC in electronic memory for certain
failures it detects. See Starting and Charging/Charging System/Testing and Inspection/Procedures/On-Board Diagnostic Test For Speed Control
System for more information. The PCM cannot be repaired and must be replaced if faulty.
CIRCUIT OPERATION
Battery Feed
Circuit A14 from the Power Distribution Center (PDC) supplies battery voltage to cavity A22 of the Powertrain Control Module (PCM). A 30
amp fuse in cavity 1 of the PDC protects circuit A14.
Ignition Feed
Circuit F18 provides an input to the Powertrain Control Module (PCM). This circuit is HOT in the START and RUN position and protected by a
10 amp fuse located in the junction block.
Power for the fuse is supplied by circuit A21 from the ignition switch.
Transmission Control
The Powertrain Control Module (PCM) controls operation of the converter clutch, overdrive clutch, and governor pressure solenoid.
The control module determines transmission shift points based on input signals from the transmission thermistor, transmission output shaft speed sensor,
crankshaft position sensor, vehicle speed sensor, throttle position sensor, and battery temperature sensor.
