RAM 2500 Truck 2WD L6-5.9L DSL Turbo VIN C (2002)
The main functions of the Engine Control Module (ECM) and Fuel Injection Pump Control Module (FPCM) are to electrically control the fuel system.
The Powertrain Control Module (PCM) does not control the fuel system.
The ECM can adapt its programming to meet changing operating conditions. If the ECM has been replaced, flashed or re-calibrated, the ECM must learn
the Accelerator Pedal Position Sensor (APPS) idle voltage. Failure to learn this voltage may result in unnecessary diagnostic trouble codes. Refer to
ECM REMOVAL/INSTALLATION for learning procedures.
The ECM receives input signals from various switches and sensors. Based on these inputs, the ECM regulates various engine and vehicle operations
through different system components. These components are referred to as ECM Outputs. The sensors and switches that provide inputs to the ECM are
considered ECM Inputs.
ECM Inputs
*
Accelerator Pedal Position Sensor (APPS) Volts
*
APPS Idle Validation Switches # 1 and # 2
*
Battery voltage
*
Camshaft Position Sensor (CMP)
*
CCD bus (+) circuits
*
CCD bus (-) circuits
*
Crankshaft Position Sensor (CKP)
*
Data link connection for DRB scan tool
*
Fuel Injection Pump Control Module (FPCM)
*
Engine Coolant Temperature (ECT) sensor
*
Ground circuits
*
Intake manifold Air Temperature (IAT) sensor
*
Manifold Air Pressure Sensor (Boost Pressure Sensor)
*
Oil pressure sensor
*
PCM
*
Power Take Off (PTO)
*
Power ground
*
Sensor return
*
Signal ground
*
Water-In-Fuel (WIF) sensor
ECM Outputs
After inputs are received by the ECM, certain sensors, switches and components are controlled or regulated by the ECM. These are considered ECM
Outputs. These outputs are for:
*
CCD bus (+) circuits
*
CCD bus (-) circuits
*
CKP and APPS outputs to the PCM
*
Data link connection for DRB scan tool
*
5 volt sensor supply
*
Fuel injection pump
*
Fuel injection pump relay
*
(FPCM) Fuel Pump Control Module
*
Fuel transfer (lift) pump
*
Intake manifold air heater relays # 1 and # 2 control circuits
*
Malfunction indicator lamp (Check engine lamp)
*
Oil pressure gauge/warning lamp
*
PCM
*
Wait-to-start warning lamp
*
Water-In-Fuel (WIF) warning lamp
