vacuum DODGE NEON 2000 Service Owner's Guide

C2415C156C280C2MODULE CONTROL
POWERTRAIN
SPEED
CONTROL
SWITCH
SIGNAL
V37
20
RD/LG
V37
20
RD/LG
43
V32
20
YL/RD
V32
20
YL/RD
5C102
3
412
V36
20
TN/RDV35
20
LG/RD
V30
20
DB/RD
SERVO CONTROL
SPEED
VEHICLE
Z1
20
BK
Z1
18
BK
S112
3 2 140
VEHICLE
SPEED
CONTROL
SWITCH CLOCKSPRING
6
CLOCKSPRING
7
DUMP
SOLENOID SPEED
CONTROL
VENT
SOLENOID
CONTROL CONTROLSOLENOIDVACUUM CONTROLSPEED
BRAKE
LAMP
SWITCH
0 OFF
1 CANCEL
2 SET/COAST
3 RES/ACCEL
4 ON
C15C10415
VENT
SOLENOIDVACUUM
SOLENOID
G101G201
SUPPLYPOWER CONTROLSPEED
Z10
20
BK/TN
Z9
14
BK
S210(8W-15-3)(8W-30-13)
(8W-15-3)(8W-15-8) (8W-33-3)
(8W-33-3)(8W-33-3)
(8W-33-3)
(8W-15-8)
8W - 30 - 12 8W-30 FUEL/IGNITION SYSTEMPL
008W-10PLI03012

POWERTRAIN
CONTROL
MODULE - C2
61 K6 18VT/WT 5V SUPPLY
62 K29 20WT/PK BRAKE LAMP SWITCH SENSE
63 - -
64 C28 18DB/OR A/C COMPRESSOR CLUTCH RELAY CONTROL
65 D21 20PK SCI TRANSMIT
66 G7 20WT/OR VEHICLE SPEED SENSOR SIGNAL
67 K51 18DB/YL AUTOMATIC SHUT DOWN RELAY CONTROL
68 K52 20PK/BK PROPORTIONAL EVAP/PURGE SOLENOID CONTROL
69 - -
70
71
72 K107 18YL LEAK DETECTION PUMP SWITCH SENSE
73
74 K31 18BR FUEL PUMP RELAY CONTROL
75 D20 20LG SCI RECIEVE
76 CLUTCH INTERLOCK SWITCH SENSE
77 K106 18WT/DG LEAK DETECTION PUMP SOLENOID CONTROL
78
79K54 18OR/BK TORQUE CONVERTOR CLUTCH SOLENOID CONTROL
80 V35 20LG/RD SPEED CONTROL VENT SOLENOID CONTROL
BLACK
71 8061 7051 6041 50
- - 60 59
20VT K59 58
IDLE AIR CONTROL NO. 1 DRIVER 20GY/RD K39 57
SPEED CONTROL VACUUM SOLENOID CONTROL 20TN/RD V36 56
55
- - 54
- - 53
INLET AIR TEMPERATURE SENSOR SIGNAL 20VT/LG G31 52
OXYGEN SENSOR 1/2 SIGNAL 20TN/WT K141 51
GROUND 20BK/TN Z12 50
20YL/BK K60 49
IDLE AIR CONTROL NO. 3 DRIVER 20BR/WT K40 48
GROUND 18BK/WT Z11 47
FUSED B(+) 18RD/WT A14 46
POWER STEERING PRESSURE SWITCH SENSE 20WT K10 45
8V SUPPLY 20OR K7 44
SENSOR GROUND 20BK/LB K4 43
- - 42
SPEED CONTROL SWITCH SIGNAL 20RD/LG V37 41
FUNCTION CIRCUIT CAV
IDLE AIR CONTROL NO. 2 DRIVER
IDLE AIR CONTROL NO. 4 DRIVER C27 18DB/PK RADIATOR FAN RELAY CONTROL
D25 20VT/YL
PCI BUS
K108 20DB EVAPORATIVE EMISSION SOLENOID SENSE
G9 18GY/BK RED BRAKE WARNING INDICATOR DRIVER
--
-- 76 T41 18BR/YL PARK/NEUTRAL POSITION SWITCH SENSE
20YL/RD T141
SPEED CONTROLEXCEPT BUILT-UP-EXPORT
MTX
ATX
8W - 80 - 38 8W-80 CONNECTOR PIN-OUTSPL
J008W-10PLI08038

Z1 20BK
2 CAV
1CIRCUIT
GROUNDFUNCTION
M1 20PK FUSED B(+)
UNDERHOOD
LAMP
CONTROL SERVOVEHICLE SPEED
41BLACK
GROUND 20BK Z1 4SPEED CONTROL BRAKE LAMP SWITCH OUTPUT 20DB/RD V30 3
SPEED CONTROL VENT SOLENOID CONTROL 20LG/RD V35 2
SPEED CONTROL VACUUM SOLENOID CONTROL 20TN/RD V36 1
FUNCTION CIRCUIT CAV
21
3 Z1 20BK GROUND
4 E2 22OR PANEL LAMPS DRIVER 4
1
SWITCH TRACTION CONTROL
TRACTION CONTROL SWITCH SENSE B27 20RD/YL 2- 1
FUNCTION CIRCUIT CAV
-
2
1
DECKLID SECURITY SWITCH SENSE G71 20VT/YL
GROUND
Z1 18BKFUNCTION
CAV CIRCUIT
1
2
CAV CIRCUIT FUNCTION
1- -
2 K54 18OR/BK TORQUE CONVERTER CLUTCH SOLENOID CONTROL
3 F12 18DB/WT FUSED IGNITION SWITCH OUTPUT (ST-RUN)
BLACK
1
23
TORQUE CONVERTER
CLUTCH SOLENOID
(ATX)
TRUNK KEY
CYLINDER SWITCH
BLACK
GRAY
WHITE
PL8W-80 CONNECTOR PIN-OUTS 8W - 80 - 47
PLI08047008W-10

CAUTION: Do not drive cup plug into the casting
as restricted cooling can result and cause serious
engine problems.
INSTALLATION
Thoroughly clean all debris/rust from inside of cup
plug hole in cylinder block or head. Be sure to
remove old sealer. Lightly coat inside of cup plug hole
with MopartStud and Bearing Mount Adhesive.
Make certain the new plug is cleaned of all oil or
grease. Using a proper driver, drive plug into hole so
that the sharp edge of the plug is at least 0.5 mm
(0.020 inch.) inside the lead in chamfer (Fig. 3).
It is not necessary to wait for curing of the sealant.
The cooling system can be refilled and the vehicle
placed in service immediately.
ENGINE PERFORMANCE
If a loss of performance is noticed, timing belt or
chain may have skipped one or two teeth. Camshaft
and crankshaft timing should be checked. Refer to
Group 9, Engine Timing belt or chain installation.
It is important that the vehicle is operating to it's
optimum performance level to maintain fuel economy
and lowest vehicle emissions. If vehicle is not operat-ing to these standards, refer to Engine Diagnosis in
this section. The following procedures can assist in
achieving the proper engine diagnosis.
(1) Test cranking amperage draw. Refer to Group
8B, Starting.
(2) Check intake manifold for vacuum leaks.
(3) Perform cylinder compression pressure test.
Refer to Engine Diagnosis in this section.
(4) Clean or replace spark plugs as necessary and
adjust gap as specified in Group 8D, Ignition System.
Tighten to specifications.
(5) Test resistance of spark plug cables. Refer to
Group 8D, Ignition System.
(6) Test ignition coils primary and secondary resis-
tance. Replace parts as necessary. Refer to Group 8D,
Ignition System.
(7) Check fuel pump pressure at idle and different
RPM ranges. Refer to Group 14, Fuel System for
specifications.
(8) The air filter elements should be replaced as
specified in Group 0, Lubrication and Maintenance.
(9) Inspect crankcase ventilation system. Refer to
Group 25, Emission Control Systems.
(10) Road test vehicle as a final test.HONING CYLINDER BORES
(1) Used carefully, the cylinder bore resizing hone,
recommended tool C-823 or equivalent, equipped
with 220 grit stones, is the best tool for this honing
procedure. In addition to deglazing, it will reduce
taper and out-of-round as well as removing light
scuffing, scoring or scratches. Usually a few strokes
Fig. 2 Access Plug
1 ± CRANKSHAFT BOLT ACCESS PLUG
2 ± RIGHT MOUNT BOLT ACCESS PLUG
3 ± FASCIA
4 ± SPLASH SHIELD
Fig. 3 Core Hole Plug Removal
1 ± CYLINDER BLOCK
2 ± REMOVE PLUG WITH PLIERS
3 ± STRIKE HERE WITH HAMMER
4 ± DRIFT PUNCH
5 ± CUP PLUG
PLENGINE 9 - 3
GENERAL INFORMATION (Continued)

ENGINE DIAGNOSIS
TABLE OF CONTENTS
page page
DIAGNOSIS AND TESTING
GENERAL INFORMATION...................8
INTAKE MANIFOLD LEAKAGE DIAGNOSIS......8
CYLINDER COMPRESSION PRESSURE TEST . . . 8
CYLINDER COMBUSTION PRESSURE
LEAKAGE TEST.........................9LASH ADJUSTER (TAPPET) NOISE
DIAGNOSIS............................9
ENGINE OIL LEAK INSPECTION..............9
ENGINE DIAGNOSISÐPERFORMANCE........11
ENGINE DIAGNOSISÐMECHANICAL.........12
DIAGNOSIS AND TESTING
GENERAL INFORMATION
Engine diagnosis is helpful in determining the
causes of malfunctions not detected and remedied by
routine maintenance.
These malfunctions may be classified as either
mechanical (e.g., a strange noise), or performance
(e.g., engine idles rough and stalls).
Refer to the Service DiagnosisÐMechanical Chart
and the Service DiagnosisÐPerformance Chart, for
possible causes and corrections of malfunctions. Refer
to Group 14, Fuel System, for the fuel system diag-
nosis.
Additional tests and diagnostic procedures may be
necessary for specific engine malfunctions that can-
not be isolated with the Service Diagnosis charts.
Information concerning additional tests and diagno-
sis is provided within the following:
²Cylinder Compression Pressure Test
²Cylinder Combustion Pressure Leakage Test
²Engine Cylinder Head Gasket Failure Diagnosis
²Intake Manifold Leakage Diagnosis
INTAKE MANIFOLD LEAKAGE DIAGNOSIS
An intake manifold air leak is characterized by
lower than normal manifold vacuum. Also, one or
more cylinders may not be functioning.
WARNING: USE EXTREME CAUTION WHEN THE
ENGINE IS OPERATING. DO NOT STAND IN A
DIRECT LINE WITH THE FAN. DO NOT PUT YOUR
HANDS NEAR THE PULLEYS, BELTS OR THE FAN.
DO NOT WEAR LOOSE CLOTHING.
(1) Start the engine.
(2) Spray a small stream of water (Spray Bottle) at
the suspected leak area.
(3) If engine RPM'S change, the area of the sus-
pected leak has been found.
(4) Repair as required.
CYLINDER COMPRESSION PRESSURE TEST
The results of a cylinder compression pressure test
can be utilized to diagnose several engine malfunc-
tions.
Ensure the battery is completely charged and the
engine starter motor is in good operating condition.
Otherwise the indicated compression pressures may
not be valid for diagnosis purposes.
(1) Check engine oil level and add oil if necessary.
(2) Drive the vehicle until engine reaches normal
operating temperature. Select a route free from traf-
fic and other forms of congestion, observe all traffic
laws, and accelerate through the gears several times
briskly.
(3) Remove all spark plugs from engine. As spark
plugs are being removed, check electrodes for abnor-
mal firing indicators fouled, hot, oily, etc. Record cyl-
inder number of spark plug for future reference.
(4) Disconnect coil wire from distributor and
secure to good ground to prevent a spark from start-
ing a fire (Conventional Ignition System). For Direct
Ignition System DIS disconnect the coil connector.
(5) Be sure throttle blade is fully open during the
compression check.
(6) Insert compression gage adaptor into the #1
spark plug hole in cylinder head. Crank engine until
maximum pressure is reached on gage. Record this
pressure as #1 cylinder pressure.
(7) Repeat the previous step for all remaining cyl-
inders.
(8) Compression should not be less than (689 kPa)
100 psi and not vary more than 25 percent from cyl-
inder to cylinder.
(9) If one or more cylinders have abnormally low
compression pressures, repeat the compression test.
(10) If the same cylinder or cylinders repeat an
abnormally low reading on the second compression
test, it could indicate the existence of a problem in
the cylinder in question.The recommended com-
pression pressures are to be used only as a
guide to diagnosing engine problems. An engine
9 - 8 ENGINEPL

ENGINE DIAGNOSISÐPERFORMANCE
CONDITION POSSIBLE CAUSE CORRECTION
ENGINE WILL NOT START 1. Weak battery. 1. Test battery. Charge or replace
as necessary. Refer to Group 8A,
Battery.
2. Corroded or loose battery
connections.2. Clean and tighten battery
connections. Apply a coat of light
mineral grease to terminals.
3. Faulty starter. 3. Test starting system. Refer to
Group 8B, Starting.
4. Faulty coil(s) or control unit. 4. Test and replace as needed.
Refer to Group 8D, Ignition System.
5. Incorrect spark plug gap. 5. Set gap. Refer to Group 8D,
Ignition System.
6. Contamination in fuel system. 6. Clean system and replace fuel
filter.
7. Faulty fuel pump. 7. Test fuel pump and replace as
needed. Refer to Group 14, Fuel
System.
8. Incorrect engine timing. 8. Check for a skipped timing
belt/chain.
ENGINE STALLS OR IDLES
ROUGH1. Idle speed too low. 1. Test minimum air flow. Refer to
Group 14, Fuel System.
2. Incorrect fuel mixture. 2. Refer to Group 14, Fuel System.
3. Intake manifold leakage. 3. Inspect intake manifold, manifold
gasket, and vacuum hoses.
4. Faulty coil(s). 4. Test and replace as necessary.
Refer to Group 8D, Ignition System.
ENGINE LOSS OF POWER 1. Dirty or incorrectly gapped plugs. 1. Clean plugs and set gap. Refer to
Group 8D, Ignition System.
2. Contamination in fuel system. 2. Clean system and replace fuel
filter.
3. Faulty fuel pump. 3. Test and replace as necessary.
Refer to Group 14, Fuel System.
4. Incorrect valve timing. 4. Correct valve timing.
5. Leaking cylinder head gasket. 5. Replace cylinder head gasket.
6. Low compression. 6. Test compression of each
cylinder.
7. Burned, warped, or pitted valves. 7. Replace valves.
8. Plugged or restricted exhaust
system.8. Install new parts, as necessary.
9. Faulty coil(s). 9. Test and replace as necessary.
Refer to Group 8D, Ignition System.
PLENGINE 9 - 11
DIAGNOSIS AND TESTING (Continued)

(4) Discharge air conditioning system, if equipped.
Refer to Group 24, Heating and Air Conditioning for
procedure.
(5) Disconnect the following: air intake duct at
intake manifold, throttle cables, electrical connectors
from throttle body and air cleaner housing.
(6) Remove air cleaner housing assembly.
(7) Remove upper radiator hose and fan module.
Refer to Group 7, Cooling System for procedure.
(8) Remove lower radiator hose.
(9) Disconnect automatic transmission cooler lines
and plug, if equipped.
(10) Disconnect shift linkage, electrical connectors,
and clutch cable, if equipped with manual transaxle.
(11) Disconnect engine wiring harness.
(12) Disconnect positive cable from Power Distri-
bution Center (PDC) and ground wire from vehicle
body.
(13) Disconnect ground wire from the vehicle body-
to-engine at the right side strut tower.
(14) Disconnect heater hoses.
(15) Disconnect vacuum hose from brake booster.
(16) Disconnect coolant reserve/recovery hose.
(17) Remove accessory drive belts. Refer to Group
7, Cooling System for procedure.
(18) Remove power steering pump and reservoir
and set them aside.
(19) Hoist vehicle and remove right inner splash
shield.
(20) Drain engine oil.
(21) Remove front wheels.
(22) Remove axle shafts. Refer to Group 3, Differ-
ential and Driveline for procedure.
(23) Disconnect exhaust system from manifold.
(24) Disconnect the downstream oxygen sensor
connector.
(25) Remove lower engine torque strut.
(26) Remove structural collar. Refer to procedure
in this section.
(27) Lower vehicle and remove A/C compressor.
(28) Raise vehicle enough to allow engine dolly
and cradle, Special Tools 6135 and 6710 to be
installed under vehicle.
(29) Loosen engine support posts to allow move-
ment for positioning onto engine locating holes and
flange on the engine bedplate. Lower vehicle and
position cradle until the engine is resting on support
posts (Fig. 26). Tighten mounts to cradle frame. This
will keep support posts from moving when removing
or installing engine and transmission.
(30) Install safety straps around the engine to cra-
dle (Fig. 26). Tighten straps and lock them into posi-
tion.
WARNING: Safety straps MUST be used.(31) Raise vehicle enough to see if straps are tight
enough to hold cradle assembly to engine.
(32) Lower vehicle so weight of the engine and
transmission ONLY is on the cradle assembly.
(33) Remove the upper engine torque strut.
(34) Remove right and left engine and transaxle
mount through bolts (Fig. 24) and (Fig. 25).
(35) Raise vehicle slowly until body is approxi-
mately 15 cm (6 in.) above normal engine mounting
locations.
(36) Remove generator, lower bracket, and upper
mounting bolt.
(37) Continue raising vehicle slowly until engine/
transaxle assembly clears engine compartment. It
may be necessary to move the engine/transmission
assembly with the cradle to allow for removal around
body flanges.
INSTALLATION
(1) Position engine and transmission assembly
under vehicle and slowly lower the vehicle over the
engine/transaxle assembly until vehicle is within 15
cm (6 in.) of engine mounting locations.
(2) Install generator, lower bracket, and adjusting
bolt.
(3) Continue lowering vehicle until engine/tran-
saxle aligns to mounting locations. Install mounting
bolts at the right and left engine/transaxle mounts
(Fig. 24) and (Fig. 25). Tighten bolts to 118 N´m (87
ft. lbs.).
(4) Install upper engine torque strut. Refer to pro-
cedure in this section.
(5) Remove safety straps from engine/transaxle
assembly. Slowly raise vehicle enough to remove the
engine dolly and cradle.
(6) Install axle shafts. Refer to Group 3, Differen-
tial and Driveline for procedure.
(7) Install structural collar. Refer to procedure in
this section tightening sequence.
Fig. 24 Right Mount Through Bolt
1 ± BOLT
2 ± RIGHT ENGINE MOUNT
3 ± ENGINE MOUNT BRACKET
9 - 26 2.0L SOHC ENGINEPL
REMOVAL AND INSTALLATION (Continued)

FUEL SYSTEM
TABLE OF CONTENTS
page page
FUEL DELIVERY SYSTEM.................... 1FUEL INJECTION SYSTEM.................. 21
FUEL DELIVERY SYSTEM
TABLE OF CONTENTS
page page
DESCRIPTION AND OPERATION
FUEL REQUIREMENTS.....................1
GASOLINE/OXYGENATE BLENDS.............2
FUEL DELIVERY SYSTEM...................3
FUEL PUMP MODULE......................3
ELECTRIC FUEL PUMP.....................4
FUEL GAUGE SENDING UNIT................4
FUEL FILTER/FUEL PRESSURE REGULATOR....4
FUEL TANK..............................4
FUEL RAIL...............................4
FUEL INJECTORS.........................5
PRESSURE-VACUUM FILLER CAP............5
ONBOARD REFUELING VAPOR RECOVERY....6
CONTROL VALVE/PRESSURE RELIEF.........6
QUICK-CONNECT FITTINGS.................6
ROLLOVER VALVES.......................7
FUEL TUBES/LINES/HOSES AND CLAMPS......8
SERVICE PROCEDURES
FUEL SYSTEM PRESSURE RELEASE
PROCEDURE...........................8INJECTOR CONNECTOR....................8
DRAINING FUEL TANK.....................9
HOSES AND CLAMPS......................9
QUICK-CONNECT FITTINGS.................9
REMOVAL AND INSTALLATION
AUTOMATIC SHUTDOWN RELAY............12
FUEL PUMP RELAY.......................12
FUEL PUMP MODULE.....................12
FUEL FILTER / PRESSURE REGULATOR......13
FUEL PUMP INLET STRAINER..............14
FUEL LEVEL SENSOR.....................14
FUEL INJECTORS........................15
FUEL TANK.............................16
FUEL FILLER NECK.......................17
ACCELERATOR PEDAL....................18
THROTTLE CABLE.......................19
SPECIFICATIONS
TORQUE...............................20
DESCRIPTION AND OPERATION
FUEL REQUIREMENTS
OPERATION
Your engine is designed to meet all emissions reg-
ulations and provide excellent fuel economy and per-
formance when using high quality unleaded gasoline
having an octane rating of 87. The use of premium
gasoline is not recommended. The use of premium
gasoline will provide no benefit over high quality reg-
ular gasoline, and in some circumstances may result
in poorer performance.
Light spark knock at low engine speeds is not
harmful to your engine. However, continued heavyspark knock at high speeds can cause damage and
immediate service is required. Engine damage result-
ing from operation with a heavy spark knock may
not be covered by the new vehicle warranty.
Poor quality gasoline can cause problems such as
hard starting, stalling and hesitations. If you experi-
ence these symptoms, try another brand of gasoline
before considering service for the vehicle.
The American Automobile Manufacturers Associa-
tion, AAMA, has issued gasoline specifications to
define the minimum fuel properties necessary to
deliver enhanced performance and durability for your
vehicle. DaimlerChrysler Corporation recommends
the use of gasoline that meet the AAMA specifica-
tions if they are available.
PLFUEL SYSTEM 14 - 1

carbon monoxide emissions. The type and amount of
oxygenate used in the blend is important.
The following are generally used in gasoline
blends:
Ethanol- (Ethyl or Grain Alcohol) properly
blended, is used as a mixture of 10 percent ethanol
and 90 percent gasoline. Gasoline blended with etha-
nol may be used in your vehicle.
MTBE/ETBE- Gasoline and MTBE (Methyl Ter-
tiary Butyl Ether) blends are a mixture of unleaded
gasoline and up to 15 percent MTBE. Gasoline and
ETBE (Ethyl Tertiary Butyl Ether) are blends of gas-
oline and up to 17 percent ETBE. Gasoline blended
with MTBE or ETBE may be used in your vehicle.
Methanol- Methanol (Methyl or Wood Alcohol) is
used in a variety of concentrations blended with
unleaded gasoline. You may encounter fuels contain-
ing 3 percent or more methanol along with other
alcohols called cosolvents.
DO NOT USE GASOLINE CONTAINING
METHANOL.
Use of methanol/gasoline blends may result in
starting and driveability problems and damage criti-
cal fuel system components.
Problems that are the result of using methanol/
gasoline blends are not the responsibility of
DaimlerChrysler Corporation and may not be covered
by the vehicle warranty.
Reformulated Gasoline
Many areas of the country are requiring the use of
cleaner-burning fuel referred to asReformulated
Gasoline. Reformulated gasoline are specially
blended to reduce vehicle emissions and improve air
quality.
DaimlerChrysler Corporation strongly supports the
use of reformulated gasoline whenever available.
Although your vehicle was designed to provide opti-
mum performance and lowest emissions operating on
high quality unleaded gasoline, it will perform
equally well and produce even lower emissions when
operating on reformulated gasoline.
Materials Added to Fuel
Indiscriminate use of fuel system cleaning agents
should be avoided. Many of these materials intended
for gum and varnish removal may contain active sol-
vents of similar ingredients that can be harmful to
fuel system gasket and diaphragm materials.
FUEL DELIVERY SYSTEM
OPERATION
The fuel delivery system consists of: the electric
fuel pump, fuel filter/fuel pressure regulator, fuel
tubes/lines/hoses, fuel rail, fuel injectors, fuel tank,
accelerator pedal and throttle cable.A fuel return system is used on all models (all
engines). Fuel is returned through the fuel pump
module and back into the fuel tank through the fuel
filter/fuel pressure regulator. A separate fuel return
line from the engine to the tank is no longer used
with any engine.
The fuel tank assembly consists of: the fuel tank,
filler tube, fuel gauge sending unit/electric fuel pump
module, a rollover valve(s) and a pressure-vacuum
filler cap.
Also to be considered part of the fuel system is the
evaporation control system or Onboard Refueling
Vapor recovery (ORVR). This is designed to reduce
the emission of fuel vapors into the atmosphere. The
description and function of the Evaporative Control
System is found in the Emission Control Systems
section.
FUEL PUMP MODULE
DESCRIPTION
The fuel pump module is installed in the fuel tank
(Fig. 1).
OPERATION
The fuel pump module contains the following:
²Electric fuel pump
²Fuel pump reservoir
²Inlet strainer
²Fuel filter/pressure regulator
²Fuel gauge sending unit
²Fuel supply line connection
Fig. 1 Fuel Pump Module
1 ± FUEL FILTER/PRESSURE REGULATOR
2 ± FUEL LEVEL SENSOR
3 ± FUEL RESERVOIR
4 ± INLET STRAINER
5 ± FLOAT
PLFUEL SYSTEM 14 - 3
DESCRIPTION AND OPERATION (Continued)

OPERATION
The fuel pressure regulator is no longer mounted
to the fuel rail on any engine. It is now located on
the fuel tank mounted fuel pump module. Refer toFuel Filter/Fuel Pressure Regulator in the Fuel
Delivery System section of this group for information.
The fuel rail is not repairable.
FUEL INJECTORS
DESCRIPTION
The injectors are positioned in the intake manifold
with the nozzle ends directly above the intake valve
port (Fig. 4).
OPERATION
The fuel injectors are 12 ohm electrical solenoids
(Fig. 5). The injector contains a pintle that closes off
an orifice at the nozzle end. When electric current is
supplied to the injector, the armature and needle
move a short distance against a spring, allowing fuel
to flow out the orifice. Because the fuel is under high
pressure, a fine spray is developed in the shape of a
hollow cone. The spraying action atomizes the fuel,
adding it to the air entering the combustion chamber.
Fuel injectors are not interchangeable between
engines.
PRESSURE-VACUUM FILLER CAP
OPERATION
The loss of any fuel or vapor out of the filler neck
is prevented by the use of a safety filler cap. The cap
will release pressure only under significant pressure
of 10.9 to 13.45 kPa (1.58 to 1.95 psi). The vacuum
release for all gas caps is between 1.94 and 2.94 kPa
(0.28 and 0.43 psi). The cap must be replaced by a
similar unit if replacement is necessary.
Fig. 2 Side ViewÐFilter/Regulator
1 ± INTERNAL FUEL FILTER
2 ± FUEL FLOW TO FUEL INJECTORS
3 ± FUEL FILTER/FUEL PRESSURE REGULATOR
4 ± O-RINGS
5 ± EXCESS FUEL BACK TO TANK
6 ± FUEL INLET
7 ± CALIBRATED SPRINGS
8 ± RUBBER GROMMET AT PUMP MODULE
9 ± LOCKING TAB
Fig. 3 Fuel Rail
Fig. 4 Fuel Injector LocationÐTypical
1 ± FUEL RAIL
2 ± INTAKE MANIFOLD
3 ± FUEL INJECTORS
PLFUEL SYSTEM 14 - 5
DESCRIPTION AND OPERATION (Continued)