FUEL INJECTION SYSTEM
TABLE OF CONTENTS
page page
DESCRIPTION AND OPERATION
INJECTION SYSTEM ......................21
PCM REPLACEMENT .....................22
MODES OF OPERATION ...................22
SYSTEM DIAGNOSIS......................24
PROGRAMMABLE COMMUNICATIONS
INTERFACE (PCI) BUS ...................24
PCM GROUND...........................25
FUEL CORRECTION or ADAPTIVE MEMORIES . . 25
POWERTRAIN CONTROL MODULE...........26
AUTOMATIC SHUTDOWN (ASD) SENSE—
PCM INPUT ...........................27
BATTERY VOLTAGE—PCM INPUT............28
ENGINE COOLANT TEMPERATURE
SENSOR—PCM INPUT ...................28
HEATED OXYGEN SENSOR (O2 SENSOR)—
PCM INPUT ...........................29
IGNITION SENSE—PCM INPUT..............30
MANIFOLD ABSOLUTE PRESSURE
SENSOR—PCM INPUT ...................30
SENSOR RETURN—PCM INPUT.............31
SCI RECEIVE—PCM INPUT.................31
PARK/NEUTRAL SWITCH...................32
THROTTLE POSITION SENSOR—PCM INPUT . . 32
VEHICLE SPEED AND DISTANCE—PCM
INPUT................................32
AUTOMATIC SHUT DOWN (ASD) AND FUEL
PUMP RELAYS—PCM OUTPUT ............32
PROPORTIONAL PURGE SOLENOID—PCM
OUTPUT ..............................33
EXHAUST GAS RECIRCULATION (LSEGR) .....33
MANIFOLD TUNING VALVE (MTV)—PCM
OUTPUT ..............................33
SHORT RUNNER VALVE (SRV) ..............34
IDLE AIR CONTROL MOTOR—PCM OUTPUT . . . 34
DATA LINK CONNECTOR—PCM OUTPUT ......35
MALFUNCTION INDICATOR (CHECK ENGINE)
LAMP—PCM OUTPUT ...................35
RADIATOR FAN RELAYS—PCM OUTPUT ......35
TACHOMETER—PCM OUTPUT ..............35
TORQUE MANAGEMENT...................36
5 VOLT SUPPLY—PCM OUTPUT.............36
8-VOLT SUPPLY—PCM OUTPUT.............36
REMOVAL AND INSTALLATION
THROTTLE BODY—2.7L ENGINE ............36
THROTTLE BODY—3.2/3.5L ENGINE..........36
THROTTLE POSITION SENSOR (TPS)—2.7L
ENGINE ..............................36
THROTTLE POSITION SENSOR (TPS)—3.2/
3.5L ENGINE...........................37
IDLE AIR CONTROL MOTOR—2.7L ...........37
IDLE AIR CONTROL MOTOR—3.2/3.5L ........37
INTAKE AIR TEMPERATURE SENSOR.........38
MANIFOLD ABSOLUTE PRESSURE (MAP)
SENSOR—2.7L.........................38
MANIFOLD ABSOLUTE PRESSURE (MAP)
SENSOR-3.2/3.5L .......................38
MANIFOLD TUNING VALVE—2.7L ENGINE .....39
MANIFOLD TUNING VALVE—3.2/3.5L ENGINE . . 39
SHORT RUNNER VALVE ...................39
VACUUM RESERVOIR SRV .................40
POWERTRAIN CONTROL MODULE (PCM) .....40
UPSTREAM HEATED OXYGEN SENSORS 1/1. . . 41
DOWNSTREAM HEATED OXYGEN SENSOR
1/2 ..................................42
AIR CLEANER ...........................42
FILTER ELEMENT REPLACEMENT ...........43
ENGINE COOLANT TEMPERATURE SENSOR. . . 43
KNOCK SENSOR.........................43
SPECIFICATIONS
VEHICLE EMISSION CONTROL
INFORMATION LABEL ...................44
TORQUE ...............................44
SPECIAL TOOLS
FUEL ..................................45
DESCRIPTION AND OPERATION
INJECTION SYSTEM
OPERATION
All engines used in this section have a sequential
Multi-Port Electronic Fuel Injection system. The MPI
system is computer regulated and provides precise
air/fuel ratios for all driving conditions. The Power-
train Control Module (PCM) operates the fuel injec-
tion system.
The PCM regulates:
• Ignition timing
• Air/fuel ratio
• Emission control devices
• Cooling fan
• Charging system
• Idle speed
• Vehicle speed control
LH FUEL SYSTEM 14 - 21
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