Dodge RAM TRUCK 1500 1995 Service Manual page 1169

mm -—- _ COMPONENT DESCRIPTION/SYSTEM OPERATION—DIESEL ENGINE 14 - 87
DIESEL E N G I N E — C @ i * P O t l E I I T DESCRIPTION/SYSTEM O P E R A T I O N
INDE1
page
Air Conditioning (A/C) Controls—PCM Pin
#27—PCM Input . . . . . 93
Air Conditioning Relay—PCM Pin #34—PCM
Output 95
Automatic Shutdown (ASD) Relay—PCM Pin
#51—PCM Output 97
Automatic Shutdown (ASD) Sense—PCM Pin
#57—PCM Input 97
Battery Temperature Sensor 90
Battery Voltage—PCM Pin #3—PCM Input . . . . . . 90
Brake Switch—PCM Pin #29—PCM Input . . . 94
CCD Bus(-)—PCM Pin #46—PCM Output . 96
Data Link Connector—PCM Pin #25—PCM Output . 93
Data Link Connector—PCM Pin #45—PCM Input . . 96
Eight Volt Power—PCM Pin #7—PCM Input 90
Engine Speed Sensor—PCM Pin #24—PCM Input . 93
Five Volt Power—PCM Pin #6—PCM Input 90
General Information 87
Generator Field—PCM Pin #20—PCM Output 92
Ignition Circuit Sense—PCM Pin #9—PCM Input . . 90
Intake Manifold Air Heater . . . . . . . . . . . . . . . . . . . 90
Intake Manifold Air Heater Relays—PCM Pins #15
and #16—PCM Output 91
Intake Manifold Air Temperature Sensor—PCM Pin
#21—PCM Input 92
Malfunction Indicator Lamp—PCM Pin #32—PCM
Output 94
Overdrive Lamp—PCM Pin #37—PCM Output . . . . 96
Overdrive Solenoid—PCM Pin #55—PCM Output . 97
page
Park/Neutral Switch—PCM Pin #30—PCM Input . . 94
PCM System Schematics—Diesel . . . . . . . . . . . . . 88
Power Ground—PCM Pin #11 . . . . . . . 90
Power Ground—PCM Pin #12 90
Powertrain Control Module (PCM)—Diesel . . . . . . . 87
Sensor Return—PCM Pin #4—PCM Input 90
Speed Control—PCM Pins #33 and #53—PCM
Output 95
Speed Control—PCM Pins #48, #49 and #50—
PCM Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Speed Control—PCM Pins #53 and #33—PCM
Output 97
System Diagnosis 87
Tachometer—PCM Pin #43—PCM Output . 96
Throttle Position Sensor—PCM Pin #22—PCM
Input 93
Torque Convertor Clutch (TCC) Solenoid—PCM Pin
#54—PCM Output . . . . . 97
Transmission Temperature Sensor—PCM Pin
#42—PCM Input . 96
Transmission Temperature Warning Lamp—PCM
Pin #31—PCM Output 94
Vehicle Speed Sensor—PCM Pin #47—PCM Input . 96
Wait-To-Start Lamp Warning Lamp—PCM Pin
#36—PCM Output 95
Water-ln-Fuel Sensor—PCM Pin #1—PCM Input . . 90
Water-ln-Fuel Warning Lamp—PCM Pin #35—PCM
Input 95
GENERAL INFORMATION
Various components, relays and switches are
operated by the powertrain control module
(PCM). This section of the group will cover a
description and operation of components con­
trolled by the PCM for vehicles equipped with
diesel powered engines.
Diesel fuel injection system components (except for
the intake manifold air heater elements) are not di­
rectly regulated by the PCM.
Refer to the Fuel Delivery—Diesel Engine section
of this group for fuel components not operated or reg­
ulated by the PCM. These components are the:
• Fuel tank
® Fuel tank module
• Low and high-pressure fuel supply lines
• Low-pressure, mechanical, fuel transfer pump (fuel
lift pump)
© High-pressure fuel injection pump
• Fuel filter/water separator
• Fuel heater
• Fuel heater relay
• Fuel shutdown solenoid
• Fuel shutdown solenoid relay
• High-pressure fuel injectors
• Fuel return line
• Fuel filter (strainer)
• Fuel drain manifold
SYSTEM DIAGNOSIS
The powertrain control module (PCM) tests many
of its own input and output circuits. If a diagnostic
trouble code (DTC) is found in a major system, this
information is stored in the PCM memory. Refer to
On-Board Diagnostics in the Diesel Engine—General
Diagnosis section of this group for DTC information.
For components not operated by the PCM, refer to
the Fuel Delivery—Diesel Engine section of this
group.
POWERTRAIN CONTROL MODULE (PCM)—DIESEL
The powertrain control module (PCM) is located in
the right-rear side of the engine compartment (Fig.
1). It is mounted to the dash panel cowl with three
bolts. The PCM was formerly referred to as the
SBEC or engine controller. Except for operation of
the intake manifold air heater elements, the PCM
does not regulate or control fuel system operation on
the diesel engine.