Dodge Ram 2004, Service Manual

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NOTE: The 2004 DR 3.7L, 4.7L, and 5.7L
vehicles are equipped with the Powertrain
Control Module and Transmission Control
Module combined in a single control module.
This
module is the Next Generation
Controller (NGC) for DaimlerChrysler and will
be referred to as the Powertrain Control
Module (PCM). The PCM has four color coded
connectors C1/A through C4/D, (C1/A - BLK,
C2/B - ORANGE, C3/C - WHITE, C4/D -
GREEN), with each connector containing 38
pins. The 5.9L Electronic Fuel Injection 24
valve Turbo Diesel has an Engine control
module (ECM) CM845. New Diagnostic proce-
dures and New DTC numbers are two of the
changes you will see which reflect the new
combined module technology. There are new
Verification tests and module replacement
procedures for the new PCM.
Two tools are required to diagnose and repair
the PCM terminals and harness connectors:
1. Miller #3638 Terminal Removal Pick must
be used to release the connector
terminals or harness and connector
damage will occur.
2. Miller #8815 Pinout Box must be used to
probe the PCM terminals or terminal
damage will occur.
3.4 COMPASS MINI-TRIP COMPUTER
(CMTC)
When equipped, the Compass/Mini Trip Com-
puter (CMTC) is located in the overhead console.
The CMTC supplements the standard vehicle in-
strumentation. The CMTC uses a vacuum fluores-
cent (VF) display to supply the vehicle operator
with a compass heading, outdoor temperature, av-
erage fuel economy, distance to empty, trip odome-
ter, and elapsed ignition on time. If equipped, the
CMTC is also available with an integrated Univer-
sal Garage Door Opener (UGDO) known as
HomeLink
t
.
The CMTC function buttons are labeled C/T,
RESET, STEP, and US/M. The three UGDO buttons
are labeled with dots to indicate the channel num-
ber.
Most of the CMTC display information is received
over the PCI bus. The CMTC sends and receives
data over the PCI bus, communicating with the
FCM (Diesel), PCM (3.7L, 4.7L, 5.7L), and the
Instrument Cluster.
8
GENERAL INFORMATION