RAM 3500 Truck 4WD L6-5.9L DSL Turbo VIN C (2002)
Engine Control Module: Description and Operation
Powertrain Control Module (PCM)
Description
Fig. 17 PCM Location
POWERTRAIN CONTROL MODULE (PCM) - DIESEL ENGINES
The Powertrain Control Module (PCM) is located in the engine compartment. The PCM is referred to as JTEC.
Two different control modules are used: The Powertrain Control Module (PCM), and the Engine Control Module (ECM). The ECM controls the fuel
system. The PCM does not control the fuel system.
The PCM's main function is to control the vehicle charging system, speed control system, transmission, air conditioning system and certain bussed
messages.
The PCM can adapt its programming to meet changing operating conditions.
The PCM receives input signals from various switches and sensors. Based on these inputs, the PCM regulates various engine and vehicle operations
through different system components. These components are referred to as PCM Outputs. The sensors and switches that provide inputs to the PCM are
considered PCM Inputs.
PCM Inputs
*
A/C request (if equipped with factory A/C)
*
A/C select (if equipped with factory A/C)
*
Accelerator Pedal Position Sensor (APPS) output from ECM
*
Auto shutdown (ASD) relay sense
*
Battery temperature sensor
*
Battery voltage
*
Brake switch
*
CCD bus (+) circuits
*
CCD bus (-) circuits
*
Crankshaft Position Sensor (CKP) output from ECM
*
Data link connection for DRB scan tool
*
Fuel level sensor
*
Generator (battery voltage) output
*
Ignition sense
*
Output shaft speed sensor
*
Overdrive/override switch
*
Park/Neutral switch (A/T only)
*
Power ground
*
Sensor return
