Chrysler RAM TRUCK 2500 1994 Service Manual page 970

MULTI-PORT FUEL INJECTION {MFI}—COMPONENT DESCRIPTION/SYSTEM
OPERATION—EXCEPT DIESEL
INDEX
page
Fuel Fi
Fuel In
Fuel In
Fuel In
Fuel In'
Fuel In
Fuel In
Fuel In
Fuel In
ter
42
Air Conditioning (A/C) Controls—PCM Pins #27 and
#28—PCM Input
Air Conditioning Relay—PCM Pin #34—PCM
Output 43
Automatic Shut Down (ASD) Relay—PCM Pin
#51—PCM Output
47
Automatic Shut Down (ASD) Sense—PCM Pin
#57—PCM Input . . 48
Battery Temperature Sensor 37
Battery Voltage—PCM Pin #3—PCM Input 36
Brake Switch—PCM Pin #29—PCM Input
42
Camshaft Position Sensor—PCM Pin #44—PCM
Input 45
CCD Bus(+)—PCM Pin #26—PCM Output 42
CCD Bus(-)—PCM Pin #46—PCM Output
46
Crankshaft Position Sensor—PCM Pin #24—PCM
Input
Data Link Connector—PCM Pin #25—PCM Output
Data Link Connector—PCM Pin #45—PCM Input .
Eight Volt Power—PCM Pin #7—PCM Input . 37
Electric Exhaust Gas Recirculation Transducer
Solenoid—Pin #35—PCM Output 44
Engine Coolant Temperature Sensor—PCM Pin
#2—PCM Input
36
Evap Canister Purge Solenoid—PCM Pin
#52—PCM Output
47
Five Volt Power—PCM Pin #6—PCM Input 37
41
42
46
48
ectors—PCM Pin #13—PCM Output 37
ectors—PCM Pin #14—PCM Output 38
ectors—PCM Pin #15—PCM Output
38
ectors—PCM Pin #16—PCM Output 38
ectors—PCM Pin #17—PCM Output . . . . . .
38
ectors—PCM Pin #18—PCM Output 39
ectors—PCM Pin #38—PCM Output 44
ectors—PCM Pin #58—PCM Output
48
Fuel Pressure Regulator 48
Fuel Pump Relay—PCM Pin #51—PCM Output . . . 47
Fuel Rail 49
General Information 29
Generator Field—PCM Pin #20—PCM Output . . . . 39
Idle Air Control (IAC) Motor—Pin #39—PCM
Output 44
Idle Air Control (IAC) Motor—Pin #40—PCM
Output 45
Idle Air Control (IAC) Motor—Pin #59—PCM
Output . 48
page
Idle Air Control (IAC) Motor—Pin #60—PCM
Output 48
Ignition Circuit Sense—PCM Pin #9—PCM Input . . 37
Ignition Coil Driver—PCM Pin #17—PCM Output . . 38
Ignition Coil Driver—PCM Pin #18—PCM Output . . 39
Ignition Coil Driver—PCM Pin #19—PCM Output . . 39
Intake Manifold Air Temperature Sensor—PCM Pin
#21—PCM Input
. 39
Malfunction Indicator Lamp—PCM Pin #32—PCM
Output 43
Manifold Absolute Pressure (MAP) Sensor—PCM
Pin #1—PCM Input 36
Open Loop/Closed Loop Modes of Operation 50
Overdrive Lamp—PCM Pin #31—PCM Output 43
Overdrive Lamp—PCM Pin #37—PCM Output 44
Overdrive Solenoid—PCM Pin #55—PCM Output . 48
Overdrive/Override Switch—PCM Pin #10—PCM
Input 37
Oxygen (02S) Sensor—PCM Pin #23—PCM Input . 40
Oxygen (02S) Sensor—PCM Pin #41—PCM Input . 45
Park/Neutral Switch—PCM Pin #30—PCM Input
. . 42
PCM Schematics—Except Diesel 3
Power Ground—PCM Pin #11 37
Power Ground—PCM Pin #12 37
Powertrain Control Module (PCM) 2
Sensor Return—PCM Pin #4—PCM Input . 37
Speed Control—PCM Pins #33 and #53—PCM
Output 43
Speed Control—PCM Pins #48, #49 and # 5 0 —
PCM Input 46
Speed Control—PCM Pins #53 and #33—PCM
Output 47
SRI Lamp—PCM Pin #56—PCM Output 48
Tachometer—PCM Pin #43—PCM Output 45
Throttle Body
49
Throttle Position Sensor—PCM Pin #22—PCM
Input 40
Torque Convertor Clutch (TCC) Solenoid—PCM Pin
#54—PCM Output 47
Transmission Temperature Sensor—PCM Pin
#42—PCM Input 45
Transmission Temperature Warning Lamp—PCM
Pin #31—PCM Output . 42
Transmission Temperature Warning Lamp—PCM
Pin #36—PCM Output 44
Vehicle Speed Sensor—PCM Pin #47—PCM Input . 46
GENERAL INFORMATION
All vehicles are equipped with either a 3.9L V-6 en­
gine, a 5.2L V-8 engine, two different 5.9L V-8 en­
gines, an 8.0L V-10 engine or a 5.9L Cummins in-line
6 cylinder diesel engine. Refer to the Diesel sections
of this group for diesel information.
The 3.9L V-6 and 5.2L V-8 engines will be referred
to in this group as: L D C (Light Duty Cycle) engines.
The 5.9L V-8 gas powered engine will be referred to
as either: LDC (Light Duty Cycle) or HDC (Heavy
Duty Cycle) engine. The 8.0L V-10 engine will be re­
ferred to as: HDC (Heavy Duty Cycle) engine.
Either of the HDC gas powered engines can be eas­
ily identified by the use of an engine mounted air in­
jection pump. The 3.9L V-6, 5.2/5.9L V-8 L D C gas
engines or the diesel engine will not use an air injec­
tion pump.