Transmission Control Systems: Application and ID
IMPORTANT NOTENew for the 2003 Ram Truck, the Powertrain Control Module (PCM) and Transmission Control Module (TCM) have been combined into a single control module on vehicles equipped with a 4.7L engine. This new module is the Next Generation Controller (NGC I).
Also new for 2003 is the 5.7L engine which uses the Next Generation Controller 2 (NGC II). The NGC II controller removes RFE transmission control system and installs Electronic Throttle Control (ETC) module system. For 3.7/5.7L engines, the Transmission Control Module is a separate controller (EATX). On 5.9L gas and 8.0L engines, the Powertrain Control Module utilizes the Jeep/Truck Engine Controller (JTEC) module which includes RE transmission control information.
Also new for 2003 5.9L Electronic Fuel Injection 24-Valve Turbo Diesel engines is a new Engine Control Module (ECM), CM845.
New diagnostic procedures and new DTC numbers are two of the changes you will see which reflect the new combined module technology.
The NGC modules will have four color-coded connectors: C1 through C4 (C1 - Black; C2 - Gray; C3 - White; C4 - Green). Each PCM connector has 38 pins. Two new tools were introduced to help diagnose and repair the new PCM (NGC) terminals and harness connectors. The Miller # 3638 terminal removal pick must be used to release the connector terminals, or harness and connector damage will occur. Also, the Miller # 8815 Pinout Box was introduced. You must use the Miller # 8815 tool instead of probing the PCM terminals, or harness and connector damage will occur. There are new Verification Tests and module replacement procedures for the new PCM.