Dodge ram truck 3500 1996 Service Manual page 1259

B R — — FUEL SYSTEM 14 - 25
TRANSMISSION TEMPERATURE S E N S O R —
PCM INPUT 36
VARIABLE F O R C E SOLENOID—PCM OUTPUT . 42
VEHICLE S P E E D AND DISTANCE S E N S O R —
PCM INPUT 37
DIAGNOSIS AND TESTING
ASD AND FUEL PUMP RELAYS 48
CAMSHAFT AND CRANKSHAFT POSITION
S E N S O R S 52
ENGINE COOLANT TEMPERATURE S E N S O R —
3.9L/5.2L/5.9L ENGINES 53
ENGINE COOLANT TEMPERATURE S E N S O R —
8.0L ENGINE 53
HEATED OXYGEN (02S) SENSORS—3.9L/5.2L/
5.9L LCD ENGINES 51
HEATED OXYGEN (02S) SENSORS—5.9L HDC
ENGINE 52
HEATED OXYGEN (02S) SENSORS—8.0L
HDC/MDC ENGINES 52
IDLE AIR CONTROL (IAC) MOTOR—3.9L/5.2L/
5.9L ENGINES 54
IDLE AIR CONTROL (IAC) MOTOR—8.0L
ENGINE 54
INTAKE MANIFOLD AIR TEMPERATURE
SENSOR—3.9L/5.2L/5.9L ENGINES 54
INTAKE MANIFOLD AIR TEMPERATURE
SENSOR—8.0L ENGINE 54
MANIFOLD ABSOLUTE P R E S S U R E (MAP)
SENSOR TEST—3.9L/5.2L/5.9L ENGINES . . . 50
MANIFOLD ABSOLUTE P R E S S U R E (MAP)
SENSOR TEST—8.0L ENGINE 51
THROTTLE BODY MINIMUM AIR FLOW C H E C K
PROCEDURE—3.9L/5.2L/5.9L ENGINES 56
THROTTLE POSITION SENSOR (TPS)—3.9L/
5.2L/5.9L ENGINES 55
THROTTLE POSITION SENSOR (TPS)—8.0L
ENGINE 55
VEHICLE S P E E D SENSOR 55
VISUAL INSPECTION—3.9L/5.2L/5.9L ENGINES . 43
VISUAL INSPECTION—8.0L ENGINE 46
REMOVAL AND INSTALLATION
AIR CLEANER HOUSING/AIR CLEANER
ELEMENT (FILTER)—3.9L/5.2L/5.9L ENGINES . 63
G E N E R A L I N F O R M A T I O N
INTRODUCTION
All engines are equipped with sequential Multi-
Port Fuel Injection (MFI). The M F I system provides
precise air/fuel ratios for all driving conditions.
The powertrain control module (PCM) operates the
fuel system. The PCM was formerly referred to as
the SBEC or engine controller. The PCM (Fig. 1) is a
pre-programmed, dual microprocessor digital com­
puter. I t regulates ignition timing, air-fuel ratio,
emission control devices, charging system, speed con­
trol, air conditioning compressor clutch engagement
AIR CLEANER HOUSING/AIR CLEANER
ELEMENT (FILTER)—8.0L V-10 ENGINE 64
AUTOMATIC SHUTDOWN (ASD) RELAY 57
CAMSHAFT POSITION SENSOR 62
CRANKSHAFT POSITION SENSOR 62
DUTY C Y C L E EVAP CANISTER P U R G E
SOLENOID—3.9L/5.2L/5.9L ENGINES 61
DUTY C Y C L E EVAP CANISTER P U R G E
SOLENOID—8.0L ENGINE 61
ENGINE COOLANT TEMPERATURE S E N S O R —
3.9L/5.2L/5.9L ENGINES 65
ENGINE COOLANT TEMPERATURE S E N S O R —
8.0L ENGINE 65
FUEL PUMP RELAY 57
IDLE AIR CONTROL (IAC) MOTOR—3.9L/5.2L/
5.9L ENGINES 59
IDLE AIR CONTROL (IAC) MOTOR—8.0L
ENGINE 60
INTAKE MANIFOLD AIR TEMPERATURE
SENSOR—3.9L/5.2L/5.9L ENGINES 66
INTAKE MANIFOLD AIR TEMPERATURE
SENSOR—8.0L ENGINE 66
MANIFOLD ABSOLUTE P R E S S U R E (MAP)
SENSOR—3.9L/5.2L/5.9L ENGINES 60
MANIFOLD ABSOLUTE P R E S S U R E (MAP)
SENSOR—8.0L ENGINE 60
OXYGEN SENSORS—3.9L/5.2L/5.9L LDC/HDC
ENGINES 62
OXYGEN SENSORS—8.0L ENGINES 63
POWERTRAIN CONTROL MODULE (PCM) 62
THROTTLE BODY—3.9L/5.2L/5.9L ENGINES . . . 57
THROTTLE BODY—8.0L ENGINE 58
THROTTLE POSITION SENSOR (TPS)—3.9L/
5.2L/5.9L ENGINES 58
THROTTLE POSITION SENSOR (TPS)—8.0L
ENGINE 58
VEHICLE S P E E D SENSOR 67
SPECIFICATIONS
TORQUE SPECIFICATIONS 67
VECI LABEL SPECIFICATIONS 67
SPECIAL TOOLS
FUEL S Y S T E M 68
and idle speed. The PCM can adapt its programming
to meet changing operating conditions.
P o w e r t r a i n C o n t r o l Module (PCM) I n p u t s rep­
resent the instantaneous engine operating conditions.
Air-fuel mixture and ignition timing calibrations for
various driving and atmospheric conditions are pre­
programmed into the PCM. The PCM monitors and
analyzes various inputs. I t then computes engine fuel
and ignition timing requirements based on these
inputs. Fuel delivery control and ignition timing will
then be adjusted accordingly.
Other inputs to the PCM are provided by the brake
light switch, air conditioning select switch and the