RAM 1500 Truck 2WD V8-5.9L VIN Z LDC (1999)
Powertrain Control Module: Description and 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 On-Board Diagnostic Test For Speed Control System for more information. The PCM cannot be repaired and must be
replaced if faulty.
