cooling CHRYSLER VOYAGER 1996 Owners Manual

(3) Drain oil.
(4) Remove oil pan bolts (Fig. 48).
(5) Remove oil pan.
INSTALLATION
(1) Install oil pan. Apply a continuous 3 mm bead
of Silicone Sealer to oil pan, install within 10 min-
utes.
(2) Install oil pan bolts and torque bolts to 11 N´m
(8 ft. lbs.).
(3) Install oil drain plug tighten to 79 N´m (58 ft.
lbs).
(4) Lower vehicle.
(5) Fill engine with proper amount of oil.
(6) Connect battery cable.
OIL PUMP
REMOVAL
(1) Raise vehicle on hoist.
(2) Remove right splash shield.
(3) Remove both accessory drive belts. Refer to
Group 7, Cooling.
(4) Remove pump shaft support bracket assembly.
(5) Remove vibration damper. Refer to Vibration
Damper Removal in this section.
NOTE: Crankshaft damper nut is left handed
thread.
(6) Remove front cover. Refer to Timing Gear
Cover Removal in this section.
(7) Remove oil pump.
INSTALLATION
(1) Install new O-ring and lubricate with clean
engine oil.
(2) Install oil pump and tighten retaining screws
to 27.5 N´m (240 in. lbs.).(3) Install front cover. Refer to Timing Gear Cover
Installation in this section.
(4) Install pump shaft support bracket assembly.
CAUTION: Correct torque on the vibration damper
nut is important or engine damage can occur.
(5) Install vibration damper. Torque nut to 441
N´m (325 ft. lbs.)
(6) Install both accessory drive belts. Refer to
Group 7, Cooling.
(7) Install right splash shield.
OIL PUMP PRESSURE RELIEF VALVE
REMOVAL
(1) Remove oil pan.
(2) Remove clip retaining relief valve.
(3) Remove relief valve cap, spring, and plunger
(Fig. 50).
(4) Check relief valve spring length. Relief valve
spring free length is 57.5mm (2.263 in.). If spring
length is less or spring is distorted it must be
replaced.
(5) Check plunger for scoring, replace if necessary.
INSTALLATION
(1) Thoroughly clean all components and relief
valve pocket in cylinder block.
(2) Fit plunger, spring and cap into block.
(3) Compress spring and install retaining clip.
Ensure clip is completely seated in groove.
Fig. 48 Oil Pan
Fig. 49 Oil Pump Drive Gear
NS/GSENGINE 9 - 67
REMOVAL AND INSTALLATION (Continued)

(5) Drain cooling system. Refer to Group 7, Cool-
ing System for procedure.
(6) Remove heater, and upper radiator hoses at
intake manifold.
(7) Disconnect coolant temperature sensor (Fig.
14).
(8) Remove the accessory drive belt. Refer to
Accessory Drive belt Removal and Installation in
Group 7, Cooling System for procedure.
(9) Remove fasteners attaching generator bracket
to cylinder head, and block.
(10) Remove intake manifold center support
bracket bolts (Y bracket) (Fig. 15)
(11) Disconnect fuel injector harness.(12) Remove lower intake manifold fasteners (Fig.
16). Remove the manifold from engine.
(13) Inspect and clean manifold. Refer to Cleaning
and Inspection outlined in this section for proce-
dures.
INSTALLATION
If the following items were removed, install and
torque to:
²Fuel Rail Bolts 22 N´m (200 in. lbs.)
²Engine Outlet Connector Bolts 28 N´m (250 in.
lbs.)
²Coolant Temperature Sensor 7 N´m (60 in. lbs.)
²Intake Air Temperature Sensor 28 N´m (250 in.
lbs.)
(1) Using a new intake gasket, position intake
manifold on the engine and install retaining bolts.
Fig. 13 Fuel Line Quick Disconnect
Fig. 14 Coolant Temperature SensorÐ2.4L
Fig. 15 Intake Manifold Center Support Bracket
Fig. 16 Intake Manifold Fasteners
NSEXHAUST SYSTEM AND INTAKE MANIFOLD 11 - 7
REMOVAL AND INSTALLATION (Continued)

(2) Tighten intake manifold fasteners in the fol-
lowing sequence (Fig. 16). Torque to 23 N´m (200 in.
lbs.). Repeat this procedure until all bolts are at
specified torque.
(3) Install intake manifold center support bracket
bolts (Y bracket):
²Fastener to block 54 N´m (40 ft. lbs.)
²Fastener to intake 28 N´m (250 in. lbs.)
(4) Install fuel hose quick connector fitting to
chassis tubes.Refer to Fuel Hoses, Clamps and
Quick Connect Fittings in Group 14, Fuel Deliv-
ery.Push the fitting onto the chassis tube until it
clicks into place. Pull on the fitting to ensure com-
plete insertion.
(5) Reverse removal procedures 2 through 12 for
installation.
CAUTION: When using the ASD Fuel System Test,
the ASD relay and fuel pump relay remain energized
for 7 minutes or until the test is stopped, or until
the ignition switch is turned to the Off position.
(6) With the ignition key in ON position, access
the DRB scan tool ASD Fuel System Test to pressur-
ize the fuel system. Check for leaks.
EXHAUST MANIFOLDÐ2.4L ENGINE
REMOVAL
(1) Raise vehicle and disconnect exhaust pipe from
the exhaust manifold at the flex-joint.
(2) Disconnect Oxygen Sensor lead wire at the rear
exhaust manifold (Fig. 17).
(3) Remove the bolts attaching the manifold to the
cylinder head. Remove manifold (Fig. 17).
(4) Inspect and clean manifold. Refer to Cleaning
and Inspection outlined in this section for proce-
dures.
INSTALLATION
(1) Install exhaust manifold with a new gasket
and tighten attaching nuts in the order shown in
(Fig. 17) to 20 N´m (175 in. lbs.).
(2) Attach exhaust pipe to exhaust manifold and
tighten bolt to 28 N´m (250 in. lbs.).
(3) Connect heated oxygen sensor lead (Fig. 17).
INTAKE MANIFOLDÐ3.0L ENGINE
REMOVAL
(1) Perform fuel system pressure release proce-
dure(before attempting any repairs).Refer to
Group 14 Fuel System for procedure.
(2) Disconnect negative battery cable. Drain cool-
ing system. See Cooling System, Group 7.
(3) Remove air inlet resonator to throttle body
hose.
(4) Remove throttle cable and transaxle kickdown
linkage (Fig. 18).
(5) Remove automatic idle speed (AIS) motor and
throttle position sensor (TPS) wiring connectors from
throttle body (Fig. 19).
(6) Remove vacuum hose harness from throttle
body.
(7) Remove PCV and Brake booster hoses from
Air Intake Plenum.
(8) Remove Ignition Coil from Intake Plenum
(Fig. 20).
(9) Remove wiring connectors from coolant temper-
ature sensor (Fig. 21).
(10) Remove vacuum connections from Air Intake
Plenum vacuum connector.
(11) Remove fuel hose from fuel rail (Fig. 21).
WARNING: WRAP SHOP TOWELS AROUND HOSES
TO CATCH ANY GASOLINE SPILLAGE.
Fig. 17 Exhaust Manifold Attaching PointsÐ2.4L
Engine
Fig. 18 Throttle Cable Attachment
11 - 8 EXHAUST SYSTEM AND INTAKE MANIFOLDNS
REMOVAL AND INSTALLATION (Continued)

(10) Connect fuel line to fuel rail (Fig. 21). Torque
hose clamps to 1 N´m (10 in. lbs.).
(11) Connect vacuum harness to air intake ple-
num.
(12) Connect and coolant temperature sensor elec-
trical connector to sensor (Fig. 21).
(13) Connect PCV and brake booster supply hose
to intake plenum.
(14) Connect automatic idle speed (AIS) motor
and throttle position sensor (TPS) electrical connec-
tors (Fig. 19).
(15) Connect vacuum vapor harness to throttle
body (Fig. 19).
(16) Install throttle cable and transaxle kickdown
linkage (Fig. 18).
(17) Install air inlet resonator hose assembly to
throttle body.
(18) Install radiator to thermostat housing hose
and heater hose to heater pipe nipple.
(19) Fill cooling system. Refer to Filling the Cool-
ing System outlined in Group 7 Cooling System for
procedure.
(20) Connect negative battery cable.
(21) With the DRB Scan Tool use ASD Fuel Sys-
tem Test to pressurize system to check for leaks.
CAUTION: When using the ASD Fuel System Test,
The Auto Shutdown (ASD) Relay will remain ener-
gized for 7 minutes or until the ignition switch is
turned to the OFF position, or Stop All Test is
selected.
EXHAUST MANIFOLDÐ3.0L ENGINE
REMOVAL
(1) Raise vehicle and disconnect exhaust pipe
from rear (cowl side) exhaust manifold at the flex-
joint.(2) Disconnect Oxygen Sensor lead wire at the
rear exhaust manifold (Fig. 28).
(3) Remove bolts attaching cross-over pipe to
manifold (Fig. 30).
(4) Remove rear heat shield (Fig. 29).
(5) Remove nuts attaching rear manifold to cylin-
der head and remove manifold.
(6) Lower vehicle and remove screws attaching
front heat shield to front manifold (Fig. 31).
(7) Remove bolts fastening crossover pipe to front
exhaust manifold and nuts fastening manifold to cyl-
inder head. Remove assemblies.
(8) Inspect and clean manifolds. Refer to Cleaning
and Inspection outlined in this section for proce-
dures.
INSTALLATION
Install the gaskets with the numbers 1-3-5
embossed on the top on the rear bank and those with
numbers 2-4-6 on the front (Radiator side) bank (Fig.
32).
(1) Install rear exhaust manifold and tighten
attaching nuts to 20 N´m (175 in. lbs.).
Fig. 27 Intake Plenum Tightening Sequence
Fig. 28 Disconnect Up Stream Heated Oxygen
Sensor Connection
Fig. 29 Rear Exhaust Manifold Heat Shield
NSEXHAUST SYSTEM AND INTAKE MANIFOLD 11 - 11
REMOVAL AND INSTALLATION (Continued)

(2) Attach exhaust pipe to exhaust manifold and
tighten bolts to 28 N´m (250 in. lbs.)
(3) Attach crossover pipe to exhaust manifold and
tighten bolt to 69 N´m (51 ft. lbs.)
(4) Install rear exhaust manifold heat shield (Fig.
29).
(5) Connect heated oxygen sensor lead (Fig. 28).
(6) Install front exhaust manifold and attach
exhaust crossover.
(7) Install front exhaust manifold heat shield and
tighten attaching screws to 15 N´m (130 in. lbs.) (Fig.
31).
INTAKE MANIFOLDÐ3.3/3.8L ENGINE
REMOVAL
(1) Remove windshield wiper module. Refer to
Group 8K Windshield Wiper and Washer Systems for
procedure.
(2) Perform fuel system pressure release proce-
dure(before attempting any repairs).Refer to
Group 14 Fuel System for procedure.
(3) Drain cooling system. See Cooling System,
Group 7 for procedure.(4) Remove air inlet resonator to throttle body
hose assembly.
(5) Remove throttle cable. Refer to Group 14 Fuel
Systems for procedure. Remove wiring harness from
throttle cable bracket.
(6) Remove automatic idle speed (AIS) motor and
throttle position sensor (TPS) wiring connectors from
throttle body (Fig. 33).
(7) Remove EGR transducer connector.
(8) Remove vacuum hose harness from throttle
body (Fig. 33).
(9) Remove PCV and brake booster hoses from air
intake plenum.
Fig. 30 Crossover Pipe
Fig. 31 Front Exhaust Manifold Heat Shield
Fig. 32 Identify Exhaust Manifold Gaskets
Fig. 33 Electrical and Vacuum Connection to
Throttle Body
11 - 12 EXHAUST SYSTEM AND INTAKE MANIFOLDNS
REMOVAL AND INSTALLATION (Continued)

(5) Make sure the injector holes are clean and all
plugs have been removed.
(6) Lube injector O-ring with a drop of clean
engine oil to ease installation.(7) Put the tip of each injector into their ports.
Push the assembly into place until the injectors are
seated in the ports (Fig. 41).
(8) Install the fuel rail attaching bolts and torque
to 22 N´m (200 in. lbs.) (Fig. 39).
(9) Install fuel tube retaining bracket screw and
torque to 4 N´m (35 in. lbs.) (Fig. 39).
(10) Connect cam sensor and coolant temperature
sensor (Fig. 40).
(11) Remove covering on lower intake manifold
and clean surface.
(12) Place the new intake manifold gasket on
lower manifold. Put upper manifold into place and
install bolts and nuts finger tight.
NOTE: At no time should the studs be replaced
with a bolt and washer.
(13) Install the generator bracket to intake mani-
fold bolt and the cylinder head to intake manifold
strut bolts. (Do not torque.)
(14) Torque intake manifold bolts to 28 N´m (250
in. lbs.) following torque sequence in (Fig. 38).
(15) Torque generator bracket to intake manifold
bolt to 54 N´m (40 ft. lbs.).
(16) Torque the cylinder head to intake manifold
strut bolts to 54 N´m (40 ft. lbs.) (Fig. 35).
(17) Connect ground strap and MAP sensor electri-
cal connectors.
(18) Connect vacuum harness to intake plenum
(Fig. 34).
(19) Using a new gasket, connect the EGR tube
flange to the intake manifold and torque to 22 N´m
(200 in. lbs.).
(20) Clip wiring harness into the hole in the throt-
tle cable bracket.
(21) Connect the wiring connectors to the throttle
position sensor (TPS) and Automatic Idle Speed (AIS)
motor (Fig. 33).
(22) Connect vacuum harness to throttle body (Fig.
33).
(23) Install the direct ignition system (DIS) coils.
Torque fasteners to 12 N´m (105 in. lbs.) (Fig. 37).
(24) Lubricate the end of the chassis fuel tube
with 30 wt. oil. Connect fuel supply hose to chassis
fuel tube assembly. Pull back on the quick connect
fitting to ensure complete insertion (Fig. 36). (Refer
to Fuel Hoses, Clamps and Quick Connect Fittings in
Group 14 Fuel Systems).
(25) Install throttle cable. Refer to Group 14 Fuel
System for procedure.
(26) Connect fuel injector wiring harness.
(27) Install air cleaner and hose assembly.
(28) Connect negative battery cable. Fill Cooling
System. See Cooling System, Group 7.
(29) With the DRB Scan Tool use ASD Fuel Sys-
tem Test to pressurize system to check for leaks.
Fig. 42 Intake Manifold Removal and Installation
Fig. 43 Intake Manifold Gasket
Fig. 44 Intake Manifold Gasket Sealing
NSEXHAUST SYSTEM AND INTAKE MANIFOLD 11 - 15
REMOVAL AND INSTALLATION (Continued)

CAUTION: When using the ASD Fuel System Test,
The Auto Shutdown (ASD) Relay will remain ener-
gized for 7 minutes or until the ignition switch is
turned to the OFF position, or Stop All Test is
selected.
EXHAUST MANIFOLDSÐ3.3/3.8L ENGINE
REMOVAL
(1) Disconnect battery negative cable.
(2) Remove accessory drive belt. Refer to Accessory
Drive section located in Group 7 Cooling System for
procedure.
(3) Remove generator.
(4) Raise vehicle and disconnect exhaust pipe
from rear (cowl side) exhaust manifold at flex-joint.
(5) Disconnect down stream oxygen sensor connec-
tor.
(6) Lower exhaust system to gain access to rear
manifold.
(7) Separate EGR tube from rear manifold and
disconnect Heated Oxygen Sensor lead wire (Fig. 45).
(8) Remove heat shield from rear engine mount.
(9) Remove Generator/Power Steering Support
Strut (Fig. 45).
(10) Remove bolts attaching crossover pipe to
manifold (Fig. 45).
(11) Disconnect up stream oxygen sensor connec-
tor.
(12) Remove bolts attaching rear manifold to cyl-
inder head and remove manifold.
(13) Lower vehicle and remove screws attaching
front heat shield to front manifold (Fig. 46).
(14) Remove bolts fastening crossover pipe to
front exhaust manifold and nuts fastening manifold
to cylinder head. Remove assemblies (Fig. 47).
(15) Inspect and clean manifold. Refer to Cleaning
and Inspection outlined in this section for proce-
dures.
INSTALLATION
(1) Install rear exhaust manifold and tighten
attaching bolts to 23 N´m (200 in. lbs.).
(2) Install generator.
NOTE: Inspect crossover pipe fasteners for dam-
age from heat and corrosion. Replace if necessary.
(3) Using new gasket attach crossover pipe to
exhaust manifold and tighten bolts to 54 N´m (40 ft.
lbs.) and connect oxygen sensor lead (Fig. 45).
(4) Install EGR Tube and Generator/Power Steer-
ing Strut (Fig. 45).
(5) Using new gaskets install front exhaust mani-
fold and tighten attaching bolts to 23 N´m (200 in.
lbs.).(6) Attach exhaust crossover with a new gasket
and tighten fasteners to 54 N´m (40 ft. lbs.) (Fig. 47).
(7) Connect up stream oxygen sensor connector.
(8) Install exhaust system.
Fig. 45 EGR Tube, Heated Oxygen Sensor and
Generator/Power Steering Strut
Fig. 46 Heat ShieldÐFront
Fig. 47 Crossover Pipe
11 - 16 EXHAUST SYSTEM AND INTAKE MANIFOLDNS
REMOVAL AND INSTALLATION (Continued)

(9) Attach exhaust pipe to exhaust manifold using
new gasket and tighten bolts to 28 N´m (250 in. lbs.).
(10) Connect down stream oxygen sensor connec-
tor.
(11) Install front manifold heat shield and tighten
attaching screws to 12 N´m (105 in. lbs.) (Fig. 46).
(12) Install accessory drive belt. Refer to Accessory
Drive section located in Group 7 Cooling System for
procedure.
(13) Connect battery negative cable.
CLEANING AND INSPECTION
INTAKE MANIFOLD
INSPECTION
Check for:
²Damage and cracks of each section.
²Clogged water passages in end cross-overs (if
equipped).
²Check for cylinder head mounting surface distor-
tion using a straightedge and thickness gauge. Refer
to specifications for warpage specification.
CLEANING
Remove the gasket material from the manifold sur-
faces.
Be careful not to gouge or scratch the sealing sur-
face.
EXHAUST MANIFOLD
INSPECTION
Inspect exhaust manifolds for damage or cracks
and check distortion of the cylinder head mounting
surface and exhaust cross-over mounting surface
with a straightedge and thickness gauge (Fig. 48).
CLEANING
Remove the gasket material from the manifold sur-
faces (if equipped). Be careful not to gouge or scratch
the sealing surface.
Fig. 48 Check Exhaust Manifold Mounting
NSEXHAUST SYSTEM AND INTAKE MANIFOLD 11 - 17
REMOVAL AND INSTALLATION (Continued)

THROTTLE BODY....................... 64
THROTTLE POSITION SENSOR............ 65
UPSTREAM OXYGEN SENSOR............. 68
SPECIFICATIONS
TORQUE.............................. 72SPECIAL TOOLS
FUEL................................. 72
GENERAL INFORMATION
INTRODUCTION
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:
²Ignition timing
²Air/fuel ratio
²Emission control devices
²Cooling fan
²Charging system
²Idle speed
²Vehicle speed control
Various sensors provide the inputs necessary for
the PCM to correctly operate these systems. In addi-
tion to the sensors, various switches also provide
inputs to the PCM.
All inputs to the PCM are converted into signals.
The PCM can adapt its programming to meet chang-
ing operating conditions.
Fuel is injected into the intake port above the
intake valve in precise metered amounts through
electrically operated injectors. The PCM fires the
injectors in a specific sequence. Under most operat-
ing conditions, the PCM maintains an air fuel ratio
of 14.7 parts air to 1 part fuel by constantly adjust-
ing injector pulse width. Injector pulse width is the
length of time the injector is open.
The PCM adjusts injector pulse width by opening
and closing the ground path to the injector. Engine
RPM (speed) and manifold absolute pressure (air
density) are the primary inputs that determine injec-
tor pulse width.
MODES OF OPERATION
As input signals to the PCM change, the PCM
adjusts its response to output devices. For example,
the PCM must calculate a different injector pulse
width and ignition timing for idle than it does for
Wide Open Throttle (WOT). There are several differ-
ent modes of operation that determine how the PCM
responds to the various input signals.
There are two different areas of operation, OPEN
LOOP and CLOSED LOOP.
During OPEN LOOP modes the PCM receives
input signals and responds according to preset PCMprogramming. Input from the oxygen (O2S) sensor is
not monitored during OPEN LOOP modes.
During CLOSED LOOP modes the PCM does mon-
itor the O2S sensor input. This input indicates to the
PCM whether or not the calculated injector pulse
width results in the ideal air/fuel ratio of 14.7 parts
air to 1 part fuel. By monitoring the exhaust oxygen
content through the O2S sensor, the PCM can fine
tune the injector pulse width. Fine tuning injector
pulse width allows the PCM to achieve optimum fuel
economy combined with low emissions.
The multi-port fuel injection system has the follow-
ing modes of operation:
²Ignition switch ON (zero RPM)
²Engine start-up
²Engine warm-up
²Cruise (Idle)
²Acceleration
²Deceleration
²Wide Open Throttle
²Ignition switch OFF
The engine start-up (crank), engine warm-up, and
wide open throttle modes are OPEN LOOP modes.
Under most operating conditions, the acceleration,
deceleration, and cruise modes,with the engine at
operating temperatureare CLOSED LOOP modes.
IGNITION SWITCH ON (ZERO RPM) MODE
When the multi-port fuel injection system is acti-
vated by the ignition switch, the following actions
occur:
²The PCM determines atmospheric air pressure
from the MAP sensor input to determine basic fuel
strategy.
²The PCM monitors the coolant temperature sen-
sor and throttle position sensor input. The PCM mod-
ifies fuel strategy based on this input.
When the key is in the ON position and the engine
is not running (zero rpm), the Automatic Shutdown
(ASD) relay and fuel pump relay are not energized.
Therefore battery voltage is not supplied to the fuel
pump, ignition coil, fuel injectors or oxygen sensor
heating element.
ENGINE START-UP MODE
This is an OPEN LOOP mode. The following
actions occur when the starter motor is engaged.
If the PCM receives the camshaft position sensor
and crankshaft position sensor signals, it energizes
the ASD relay and fuel pump relay. These relays sup-
ply battery voltage to the fuel pump, fuel injectors,
14 - 30 FUEL SYSTEMNS
SPECIFICATIONS (Continued)

IGNITION SWITCH OFF MODE
When the ignition switch is turned to the OFF
position, the following occurs:
²All outputs are turned off.
²No inputs are monitored.
²The PCM shuts down.
DESCRIPTION AND OPERATION
SYSTEM DIAGNOSIS
The PCM can test many of its own input and out-
put circuits. If the PCM senses a fault in a major
system, the PCM stores a Diagnostic Trouble Code
(DTC) in memory.
For DTC information, refer to Group 25, Emission
Control Systems. See On-Board Diagnostics.
CCD BUS
Various controllers and modules exchange informa-
tion through a communications port called the CCD
Bus. The PCM transmits the malfunction indicator
(check engine) lamp On/Off signal, engine RPM and
vehicle load information on the CCD Bus.
POWERTRAIN CONTROL MODULE (PCM)
The PCM is a digital computer containing a micro-
processor (Fig. 1). The PCM receives input signals
from various switches and sensors that are referred
to as PCM Inputs. Based on these inputs, the PCM
adjusts various engine and vehicle operations
through devices that are referred to as PCM Out-
puts.PCM Inputs:
²Air Conditioning Head Pressure
²Battery Voltage
²Brake Switch
²Camshaft Position Sensor
²Crankshaft Position Sensor
²Engine Coolant Temperature Sensor
²Heated Oxygen Sensors (Upstream and Down-
stream)
²Intake Air Temperature Sensor (2.4L only)
²Knock Sensor (execpt 3.0L)
²Manifold Absolute Pressure (MAP) Sensor
²SCI Receive
²Speed Control System Controls
²Throttle Position Sensor
²Transaxle Park/Neutral Position Switch (auto-
matic transaxle)
²Transmission Control Module
²Vehicle Speed Sensor
PCM Outputs:
²Air Conditioning Clutch Relay
²Automatic Shutdown (ASD) Relay
²Data Link Connector
²Proportional Purge Solenoid
²Electric EGR Transducer
²Fuel Injectors
²Fuel Pump Relay
²Generator Field
²Idle Air Control Motor
²Ignition Coil
²Leak Detection Pump
²Malfunction Indicator (Check Engine) Lamp
²Radiator Fan Control Module
²Speed Control Solenoids
²Tachometer Output
²Torque Converter Clutch Solenoid (3 speed
transmission)
²Transmission Control Module
Based on inputs it receives, the PCM adjusts fuel
injector pulse width, idle speed, ignition spark
advance, ignition coil dwell and canister purge oper-
ation. The PCM regulates the cooling fan, air condi-
tioning and speed control systems. The PCM changes
generator charge rate by adjusting the generator
field.
The PCM adjusts injector pulse width (air/fuel
ratio) based on the following inputs:
²Battery voltage
²Engine coolant temperature
²Exhaust gas content (oxygen sensors)
²Engine speed (crankshaft position sensor)
²Manifold absolute pressure
²Throttle position
The PCM adjusts ignition timing based on the fol-
lowing inputs.
²Barometric pressure
Fig. 1 Powertrain Control Module (PCM)
14 - 32 FUEL SYSTEMNS
GENERAL INFORMATION (Continued)