check engine DODGE NEON 1997 1.G Wiring Diagrams Workshop Manual

Downloaded from www.Manualslib.com manuals search engine 8W-01 GENERAL INFORMATION
INDEX
page page
DESCRIPTION AND OPERATION
CIRCUIT IDENTIFICATION................. 3
CONNECTOR/GROUND LOCATIONS......... 1
CONNECTORS.......................... 3
ELECTROSTATIC DISCHARGE (ESD)
SENSITIVE DEVICES.................... 5
FASTENERS............................ 5
HOW TO USE THIS GROUP................ 1
NOTES, CAUTIONS, and WARNINGS......... 2
POSITIVE TEMPERATURE COEFFICIENT..... 5
SECTION IDENTIFICATION................. 1
SPLICE LOCATIONS...................... 1
SYMBOLS.............................. 3
TAKE OUTS............................ 3
WIRE CODE IDENTIFICATION.............. 2
DIAGNOSIS AND TESTING
CHECKING FOR TERMINAL SPREADING...... 6INTERMITTENT AND POOR CONNECTIONS . . . 6
TROUBLESHOOTING TESTS............... 6
TROUBLESHOOTING TOOLS............... 5
TROUBLESHOOTING WIRING PROBLEMS.... 7
SERVICE PROCEDURES
CONNECTOR AND TERMINAL
REPLACEMENT........................ 9
CONNECTOR REPLACEMENT.............. 9
DIODE REPLACEMENT................... 11
FUSIBLE LINK REPLACEMENT............. 8
TERMINAL REPLACEMENT............... 10
TERMINAL/CONNECTOR REPAIR-MOLEX
CONNECTORS........................ 8
WIRING REPAIR......................... 7
SPECIAL TOOLS
WIRING/TERMINAL...................... 11
DESCRIPTION AND OPERATION
HOW TO USE THIS GROUP
The purpose of this group is to show the electrical
circuits in a clear, simple fashion and to make trou-
bleshooting easier. Components that work together
are shown together. All electrical components used in
a specific system are shown on one diagram. The feed
for a system is shown at the top of the page. All
wires, connectors, splices, and components are shown
in the flow of current to the bottom of the page. Wir-
ing which is not part of the circuit represented is ref-
erenced to another page/section, where the complete
circuit is shown. In addition, all switches, compo-
nents, and modules are shown in theat rest posi-
tion with the doors closed and the key removed
from the ignition.
If a component is part of several different circuits,
it is shown in the diagram for each. For example, the
headlamp switch is the main part of the exterior
lighting, but it also affects the interior lighting and
the chime warning system.It is important to real-
ize that no attempt is made on the diagrams to
represent components and wiring as they
appear on the vehicle. For example, a short
piece of wire is treated the same as a long one.
In addition, switches and other components are
shown as simply as possible, with regard to
function only.
SECTION IDENTIFICATION
Sections in Group 8W are organized by sub-sys-
tems. The sections contain circuit operation descrip-
tions, helpful information, and system diagrams. The
intention is to organize information by system, con-
sistently from year to year.
CONNECTOR/GROUND LOCATIONS
Section 8W-90 contains connector/ground location
illustrations. The illustrations contain the connector
name (or number)/ground number and component
identification. Connector/ground location charts in
Section 8W-90 reference the illustration number for
components and connectors.
Section 8W-80 shows each connector and the cir-
cuits involved with that connector. The connectors
are identified using the name/number on the Dia-
gram pages.
SPLICE LOCATIONS
Splice Location charts in Section 8W-70 show the
entire splice, and provide references to other sections
the splice serves.
Section 8W-95 contains illustrations that show the
general location of the splices in each harness. The
illustrations show the splice by number, and provide
a written location.
PL8W - 01 GENERAL INFORMATION 8W - 01 - 1

Downloaded from www.Manualslib.com manuals search engine ²Voltmeter - Used to check for voltage on a cir-
cuit. Always connect the black lead to a known good
ground and the red lead to the positive side of the
circuit.
CAUTION: Most of the electrical components used
in today's vehicle are solid state. When checking
voltages in these circuits use a meter with a 10-me-
gohm or greater impedance.
²Ohmmeter - Used to check the resistance
between two points of a circuit. Low or no resistance
in a circuit means good continuity.
CAUTION: - Most of the electrical components used
in today's vehicle are Solid State. When checking
resistance in these circuits use a meter with a
10-megohm or greater impedance. In addition, make
sure the power is disconnected from the circuit.
Circuits that are powered up by the vehicle electri-
cal system can cause damage to the equipment and
provide false readings.
²Probing Tools - These tools are used for probing
terminals in connectors (Fig. 9). Select the proper
size tool from Special Tool Package 6807, and insert
it into the terminal being tested. Use the other end
of the tool to insert the meter probe.
INTERMITTENT AND POOR CONNECTIONS
Most intermittent electrical problems are caused
by faulty electrical connections or wiring. It is also
possible for a sticking component or relay to cause a
problem. Before condemning a component or wiring
assembly check the following items.
²Connectors are fully seated
²Spread terminals, or terminal push out
²Terminals in the wiring assembly are fully
seated into the connector/component and locked in
position
²Dirt or corrosion on the terminals. Any amount
of corrosion or dirt could cause an intermittent prob-
lem
²Damaged connector/component casing exposing
the item to dirt and moisture²Wire insulation that has rubbed through causing
a short to ground
²Wiring broke inside of the insulation
CHECKING FOR TERMINAL SPREADING
When an intermittent or open circuit is suspected
it is important to check for a spread terminal. To
accomplish this remove the suspect female terminal
from its connector.
Check the female terminal for drag when mated
with the appropriate male terminal. If the terminal
is spread (no or little drag felt) replace the terminal
using the procedures covered in this section of the
wiring diagrams.
TROUBLESHOOTING TESTS
Before beginning any tests on a vehicles electrical
system use the Wiring Diagrams and study the cir-
cuit. Also refer to the Troubleshooting Wiring Prob-
lems section in this section.
TESTING FOR VOLTAGE
(1) Connect the ground lead of a voltmeter to a
known good ground (Fig. 10).
(2) Connect the other lead of the voltmeter to the
selected test point. The vehicle ignition may need to
be turned ON to check voltage. Refer to the appropri-
ate test procedure.
TESTING FOR CONTINUITY
(1) Remove the fuse for the circuit being checked
or, disconnect the battery.
(2) Connect one lead of the ohmmeter to one side
of the circuit being tested (Fig. 11).
Fig. 9 Probing Tool
Fig. 10 Testing for Voltage
8W - 01 - 6 8W - 01 GENERAL INFORMATIONPL
DIAGNOSIS AND TESTING (Continued)

Downloaded from www.Manualslib.com manuals search engine (3) Connect the other lead to the other end of the
circuit being tested. Low or no resistance means good
continuity.
TESTING FOR A SHORT TO GROUND
(1) Remove the fuse and disconnect all items
involved with the fuse.
(2) Connect a test light or a voltmeter across the
terminals of the fuse.
(3) Starting at the fuse block, wiggle the wiring
harness about six to eight inches apart and watch
the voltmeter/test lamp.
(4) If the voltmeter registers voltage or the test
lamp glows, there is a short to ground in that gen-
eral area of the wiring harness.
TESTING FOR A SHORT TO GROUND ON
FUSES POWERING SEVERAL LOADS
(1) Refer to the wiring diagrams and disconnect or
isolate all items on the fused circuit.
(2) Replace the blown fuse.
(3) Supply power to the fuse by turning ON the
ignition switch or re-connecting the battery.
(4) Start connecting the items in the fuse circuit
one at a time. When the fuse blows the circuit with
the short to ground has been isolated.
TESTING FOR A VOLTAGE DROP
(1) Connect the positive lead of the voltmeter to
the side of the circuit closest to the battery (Fig. 12).
(2) Connect the other lead of the voltmeter to the
other side of the switch or component.
(3) Operate the item.(4) The voltmeter will show the difference in volt-
age between the two points.
TROUBLESHOOTING WIRING PROBLEMS
When troubleshooting wiring problems there are
six steps which can aid in the procedure. The steps
are listed and explained below. Always check for non-
factory items added to the vehicle before doing any
diagnosis. If the vehicle is equipped with these items,
disconnect them to verify these add-on items are not
the cause of the problem.
(1) Verify the problem.
(2) Verify any related symptoms. Do this by per-
forming operational checks on components that are
in the same circuit. Refer to the wiring diagrams.
(3) Analyze the symptoms. Use the wiring dia-
grams to determine what the circuit is doing, where
the problem most likely is occurring and where the
diagnosis will continue.
(4) Isolate the problem area.
(5) Repair the problem.
(6) Verify proper operation. For this step check for
proper operation of all items on the repaired circuit.
Refer to the wiring diagrams.
SERVICE PROCEDURES
WIRING REPAIR
When replacing or repairing a wire, it is important
that the correct gauge be used as shown in the wir-
ing diagrams. The wires must also be held securely
in place to prevent damage to the insulation.
(1) Disconnect battery negative cable
Fig. 11 Testing for Continuity
Fig. 12 Testing for Voltage Drop
PL8W - 01 GENERAL INFORMATION 8W - 01 - 7
DIAGNOSIS AND TESTING (Continued)

Downloaded from www.Manualslib.com manuals search engine CONNECTOR REPLACEMENT
(1) Disconnect battery.
(2) Disconnect the connector that is to be repaired
from its mating half/component
(3) Remove the connector locking wedge, if
required (Fig. 16)
(4) Position the connector locking finger away from
the terminal using the proper pick from special tool
kit 6680. Pull on the wire to remove the terminal
from the connector (Fig. 17) (Fig. 18).
(5) Reset the terminal locking tang, if it has one.
(6) Insert the removed wire in the same cavity on
the repair connector.
(7) Repeat steps four through six for each wire in
the connector, being sure that all wires are inserted
into the proper cavities. For additional connector pin-
out identification, refer to the wiring diagrams.
(8) Insert the connector locking wedge into the
repaired connector, if required.
(9) Connect connector to its mating half/compo-
nent.
(10) Connect battery and test all affected systems.
CONNECTOR AND TERMINAL REPLACEMENT
(1) Disconnect battery.
(2) Disconnect the connector (that is to be
repaired) from its mating half/component.
(3) Cut off the existing wire connector directly
behind the insulator. Remove six inches of tape from
the harness.
(4) Stagger cut all wires on the harness side at 1/2
inch intervals (Fig. 19).
(5) Remove 1 inch of insulation from each wire on
the harness side.
(6) Stagger cut the matching wires on the repair
connector assembly in the opposite order as was done
on the harness side of the repair. Allow extra lengthfor soldered connections. Check that the overall
length is the same as the original (Fig. 19).
(7) Remove 1 inch of insulation from each wire.
Fig. 16 Connector Locking Wedge
Fig. 17 Terminal Removal
Fig. 18 Terminal Removal Using Special Tool
Fig. 19 Stagger Cutting Wires
PL8W - 01 GENERAL INFORMATION 8W - 01 - 9
SERVICE PROCEDURES (Continued)

Downloaded from www.Manualslib.com manuals search engine 8W-02 COMPONENT INDEX
INDEX
page
SCHEMATICS AND DIAGRAMS........................................................... 1
DESCRIPTION AND OPERATION.......................................................... 3
Component Page
A/C Compressor Clutch.................8W-42
A/C Compressor Clutch Relay............8W-42
A/C Cycling Switch....................8W-42
A/C Heater Blower Motor................8W-42
A/C Heater Control Switch...............8W-42
A/C High Pressure Switch...............8W-42
A/C Low Pressure Switch................8W-42
ABS Hydraulic Modulator...............8W-35
ABS Pump Motor......................8W-35
ABS Pump Motor Relay.................8W-35
ABS Relay Box........................8W-35
ABS System Relay.....................8W-35
ABS Warning Lamp....................8W-35
Airbag Control Module..................8W-43
Airbag Impact Sensors..................8W-43
Airbag Warning Lamp..................8W-40
Antenna.............................8W-47
Anti-Lock Warning Lamp................8W-40
Ash Receiver Lamp....................8W-44
Automatic Shut Down Relay.............8W-30
Back-Up Lamp Switch..................8W-51
Back-Up Lamps.......................8W-51
Battery..............................8W-20
Battery Temperature Sensor.............8W-30
Blower Motor Resistor Block.............8W-42
Brake Warning Lamp...................8W-40
Brake Warning Lamp Switch.............8W-40
Camshaft Position (CMP) Sensor..........8W-30
Capacitor.........................8W-10, 20
Charge Indicator Lamp.................8W-40
Check Engine Lamp....................8W-40
Cigar Lighter Relay....................8W-41
Cigar Lighter/Power Outlet..............8W-41
Circuit Breaker.....................8W-11,62
Circuit Breaker (FB)...................8W-11
Clockspring..........................8W-41
Cluster Illumination Lamps..............8W-40
Clutch Pedal Position Switch..........8W-10, 21
Combination Flasher...................8W-52
Controller Anti-Lock Brake..............8W-35
Crankshaft Position (CKP) Sensor.........8W-30
Data Link Connector...................8W-30
Diode............................8W-15, 42
Dome Lamp..........................8W-44Component Page
Door Ajar Switches.....................8W-44
Door Jamb Switches....................8W-40
Door Lock Motors......................8W-61
Door Lock Switches....................8W-61
Door Speakers........................8W-47
Driver Side Airbag.....................8W-43
Duty Cycle Evap/Purge Solenoid..........8W-30
EGR Transducer Solenoid...............8W-30
Engine Coolant Temperature (ECT) Sensor . . 8W-30
Engine Coolant Temperature Gauge.......8W-40
Engine Oil Pressure Switch..............8W-40
Engine Starter Motor...................8W-21
Engine Starter Motor Relay..............8W-21
Fog Lamp Relay....................8W-50, 51
Fog Lamps........................8W-50, 51
Front Fog Lamp Switch.................8W-50
Fuel Gauge...........................8W-40
Fuel Injectors.........................8W-30
Fuel Pump Module.....................8W-30
Fuel Pump Relay......................8W-30
Fuse Block...........................8W-11
Fuses (FB)...........................8W-11
Fuses (PDC)..........................8W-10
Fusible Link.......................8W-20, 21
Generator............................8W-20
Glove Box Lamp And Switch.............8W-44
Ground Distribution....................8W-15
Headlamp Dimmer And Optical
Horn Switch........................8W-50
Headlamp Leveling Motors..............8W-50
Headlamp Leveling Switch...............8W-50
Headlamp Switch......................8W-50
Headlamps...........................8W-50
Heated Oxygen Sensors.................8W-30
High Beam Indicator Lamp..............8W-40
Horn Relay...........................8W-41
Horn Switches........................8W-41
Horns...............................8W-41
IAT/MAP Sensor......................8W-30
Idle Air Control (IAC) Motor.............8W-30
Ignition Coil Pack.....................8W-30
Ignition Switch........................8W-10
Immobilizer Engine Sensor..............8W-30
Immobilizer Sensor....................8W-30
PL8W - 02 COMPONENT INDEX 8W - 02 - 1

Downloaded from www.Manualslib.com manuals search engine 8W-21 STARTING SYSTEM
DESCRIPTION AND OPERATION
STARTING SYSTEM- MANUAL TRANSMISSION
The Power Distribution Center (PDC) supplies bat-
tery voltage to the engine starter motor solenoid
through circuit T40 when the coil side of the engine
starter motor relay energizes. Circut A1 supplies the
battery voltage for the contact side of the relay. Cir-
cuit A1 and circuit T40 are protected by a 30 amp
fuse and feeds the contact side of the engine starter
motor relay. Both the 30 amp fuse and the engine
starter motor relay are located in the PDC.
The ignition switch supplies battery voltage to the
coil side of the engine starter motor relay on circuit
A41 when the key is moved to the START position
and the operator has pressed the clutch pedal to
CLOSE the clutch pedal position switch. Circuit Z1
supplies the ground for the coil side of the engine
starter motor relay. When the coil side of the relay
energizes, the contacts CLOSE, supplying battery
voltage to the engine starter motor solenoid.
Circuit A0 (battery positive cable) supplies battery
voltage to the motor of the starter when the solenoid
energizes.
HELPFUL INFORMATION
²Check for blown engine starter motor fuse in the
PDC.
²Move ignition key to the START position and
with the clutch pedal pressed, listen for starter motor
relay to click. The engine starter motor relay is
located in the PDC.
²Check for a good ground at starter motor.
²The left headlamp ground is the end point for
the starter relay coil ground circuit and is located at
the left side of the radiator closure panel.
STARTING SYSTEM (AUTOMATIC TRANSMISSION)
The Power Distribution Center (PDC) supplies bat-
tery voltage to the engine starter motor solenoid
through circuit T40 when the coil side of the engine
starter motor relay energizes. Circuit A1 supplies
battery voltage to the contact side of the relay. Cir-
cuit A1 and circuit T40 are protected by a 30 amp
fuse and feeds the contact side of the engine starter
motor relay. Both the 30 amp fuse and the engine
starter motor relay are located in the PDC.
The ignition switch supplies battery voltage to the
coil side of the engine starter motor relay on circuit
A41 when the key is moved to the START position
and the park/neutral portion of the park/neutral posi-
tion switch (3 speed transmission) is CLOSED.
Ground for the coil side of the engine starter motor
relay is supplied by circuit T41.Circuit A0 (battery positive cable) supplies battery
voltage to the motor of the engine starter when the
solenoid energizes.
HELPFUL INFORMATION
²Check for blown engine starter motor fuse in the
PDC.
²With the gear selector in the Park or Neutral
position, move ignition key to the START position
and listen for engine starter motor relay to click. The
engine starter motor relay is located in the PDC.
²Check for a good ground at engine starter motor.
PL8W - 21 STARTING SYSTEM 8W - 21 - 3

Downloaded from www.Manualslib.com manuals search engine C277C13C2CLUSTER INSTRUMENT
8611C103
G12
22
TN/BK
G12
20
TN/BK
G21
22
GY/LB
G21
20
GY/LB
G3
22
BK/PK
G3
20
BK/PK
951
SWITCH PRESSURE
HIGH
A/C
G3
20
BK/PKC20
18
BR/OR
C20
20
BR/OR
2
2
36
13C160
RELAY FAN
STATE
SOLID
GENERATOR
K173
20
DG
K173
20
LGC28
18
DB/ORK20
18
DG
C15673C18C238C218C264C14C2
GENERATOR
LAMP
DRIVERTACHOMETER
SIGNALCHECK
ENGINE
LAMP
DRIVERA/C
SWITCH
SENSERADIATOR
FAN
RELAY
CONTROLA/C
COMPRESSOR
CLUTCH
RELAY
CONTROLGENERATOR
FIELD
DRIVER
MODULE CONTROL
POWERTRAIN (IN PDC) RELAY
CLUTCH
COMPRESSOR
A/C
(8W-40-3)
(8W-40-5)
(8W-40-6)
(8W-42-5)
(8W-42-5)
(8W-20-2) (8W-42-2)
PL-RHD8W-30 FUEL/IGNITION SYSTEM 8W - 30 - 11
PLR03010978W-1

Downloaded from www.Manualslib.com manuals search engine 8W-30 FUEL/IGNITION SYSTEMS
INDEX
page page
DESCRIPTION AND OPERATION
AUTOMATIC SHUT DOWN RELAY.......... 15
BATTERY FEED........................ 14
BATTERY TEMPERATURE SENSOR......... 18
CAMSHAFT POSITION SENSOR........... 16
CRANKSHAFT POSITION SENSOR......... 16
DATA LINK CONNECTOR................. 15
DUTY CYCLE EVAP/PURGE SOLENOID...... 19
EGR TRANSDUCER (EET) SOLENOID....... 19
ENGINE COOLANT
TEMPERATURE SENSOR............... 16
FUEL INJECTORS....................... 18
FUEL PUMP MOTOR.................... 15
HEATED OXYGEN SENSORS.............. 16
IDLE AIR CONTROL MOTOR.............. 18
IGNITION COIL PACK.................... 18IGNITION SWITCH...................... 14
INTAKE AIR TEMPERATURE SENSOR....... 17
KNOCK SENSOR....................... 17
LOW FUEL DETECT INPUT............... 19
MANIFOLD ABSOLUTE
PRESSURE SENSOR.................. 17
PARK/NEUTRAL POSITION SWITCH INPUT
(3±SPD TRANSMISSION)................ 19
POWER (DEVICE) GROUND............... 14
POWER STEERING PRESSURE SWITCH..... 19
SIGNAL GROUND....................... 14
THROTTLE POSITION SENSOR............ 17
TORQUE CONVERTER CLUTCH SOLENOID
(TCC)............................... 19
VEHICLE SPEED SENSOR................ 15
DESCRIPTION AND OPERATION
IGNITION SWITCH
In the RUN position, the ignition switch connects
circuit A1 from the Power Distribution Center (PDC)
to circuit A21. A 30 amp fuse in the PDC protects cir-
cuits A1 and A21. Circuit A21 feeds a bus bar in the
fuse block. The bus bar feeds circuits G5, F12, and
F15.
²Circuit G5 powers the gauge cluster warning
lamps and the daytime running lamp (DRL) module.
Fuse cavity 11 (5 amp) in the fuse block protects cir-
cuit G5.
²Circuit F12 splices to the Powertrain Control
Module (PCM), duty cycle purge solenoid, EGR sole-
noid, ABS system, and a bus bar in the PDC. The
bus bar in the PDC feeds the coil side of the radiator
fan relay, A/C compressor clutch relay, and the fuel
pump relay. A 15 amp fuse in the fuse block, cavity
10, protects circuit F12.
²Circuit F15 feeds the Airbag Control Module
(ACM). A 10 amp fuse in the fuse block, cavity 9, pro-
tects circuit F15.
BATTERY FEED
Circuit A14 from the Power Distribution Center
(PDC) supplies battery voltage to cavity 46 of the
Powertrain Control Module (PCM). A 20 amp fuse in
the PDC protects circuit A14.
HELPFUL INFORMATION
Circuit A14 connects to a bus bar in the PDC that
the battery feeds. Circuit A14 powers the AutomaticShut Down (ASD) relay and fuel pump relay. The
A14 circuit also splices to the data link connector.
POWER (DEVICE) GROUND
Circuit Z12 connects to cavities 10 and 50 of the
Powertrain Control Module (PCM). The Z12 circuit
provides ground for PCM internal drivers that oper-
ate high current devices like the injectors and igni-
tion coils.
Internal to the PCM, the power (device) ground cir-
cuit connects to the PCM sensor return circuit (from
circuit K4) and the signal ground circuit (Z11).
HELPFUL INFORMATION
Circuit Z12 which supplies ground for the PCM
high current drivers, has the same termination point
as circuit Z11. The termination point is the left side
of the radiator closure panel.
If the system loses ground for the ganged circuits,
at the left side of the radiator closure panel, the vehi-
cle will not operate. Check the connection at the
ganged ground circuit eyelet.
SIGNAL GROUND
The signal ground circuit Z11 connects to cavity 47
of the PCM. The Z11 circuit provides ground for the
sensors that provide inputs to the PCM. Internal to
the PCM, the signal ground circuit connects to the
PCM sensor return circuit (from circuit K4) and the
power (device) ground circuit (Z12).
The termination point for circuit Z11 is an eyelet
attached to the left side of the radiator closure panel.
8W - 30 - 14 8W - 30 FUEL/IGNITION SYSTEMSPL

Downloaded from www.Manualslib.com manuals search engine HELPFUL INFORMATION
Circuit Z12 which supplies ground for the PCM
high current drivers, has the same termination point
as circuit Z11. The termination point is the left side
of the radiator closure panel.
If the system loses ground for the ganged circuits,
at the left side of the radiator closure panel, the vehi-
cle will not operate. Check the connection at the
ganged ground circuit eyelet.
DATA LINK CONNECTOR
Circuit A14 supplies battery voltage to the univer-
sal data link connector. Circuit A14 originates in the
Power Distribution Center (PDC) and connects to a
battery fed bus bar. A 20 amp fuse protects circuit
A14.
A twisted pair of wires, circuits D1 and D2, from
the Airbag Control Module (ACM) connect to the uni-
versal data link connector.
Ground circuit Z12 splices to two cavities of the
data link connector. The Z12 circuit also connects to
cavities 10 and 50 of the PCM connector.
Circuit D20 connects to cavity 75 of the PCM and
to the universal data link connector. Circuit D20 is
the SCI receive circuit for the PCM.
Circuit D21 connects to cavity 65 of the PCM and
to the universal data link connector. Circuit D21 is
the SCI transmit circuit for the PCM. The D21 cir-
cuit splices to the ABS module.
HELPFUL INFORMATION
The grounding point for circuit Z12 is the left side
of the radiator closure panel.
Circuit Z12 also supplies ground for the PCM high
current drivers and has the same termination point
as circuit Z11.
If the system loses ground for the ganged circuits
at the left side radiator closure panel the vehicle will
not operate. Check the connection at the ganged
ground circuit eyelet.
AUTOMATIC SHUT DOWN RELAY
The Automatic Shut Down (ASD) relay is located
in the Power Distribution Center (PDC). Power for
the coil and contact side of the relay is supplied on
circuit A14. This circuit is HOT at all times and pro-
tected by a 20 amp fuse located in the PDC.
The Powertrain Control Module (PCM) controls the
ground path for the coil side of the relay on circuit
K51. This circuit connects to cavity 67 of the PCM.
When the PCM supplies the ground path on circuit
K51 the contacts in the relay CLOSE connecting cir-
cuits A14 and A142. The A142 circuit is spliced and
supplies power to the generator, fuel injectors, PCM,
ignition coil, and heated oxygen sensors.
HELPFUL INFORMATION
²Refer to group 14 Fuel System, for additional
information.
²Check the 20 amp fuse located in the PDC.
FUEL PUMP MOTOR
Circuit A14 is a bus bar in the Power Distribution
Center (PDC) and connects to battery voltage. The
contact side of the fuel pump relay connects circuit
A14 and circuit A141. A 20 amp fuse in the PDC pro-
tects circuits A14 and A142.
Circuit A141 supplies voltage for the fuel pump
motor. Circuit Z1 provides ground for the fuel pump
motor. The grounding point for circuit Z1 is the right
rear wheel house.
Circuit F12 supplies voltage to the coil side of the
fuel pump relay. The Powertrain Control Module
(PCM) controls the ground path circuit for the coil
side of the fuel pump relay on circuit K31. Circuit
K31 connects to cavity 74 of the PCM.
HELPFUL INFORMATION
Circuit F12 originates in the fuse block where it
connects to a bus bar fed by circuit A21. In the
START and RUN position, the ignition switch con-
nects circuit A1 from the PDC to circuit A21. A 30
amp fuse in the PDC protects circuits A1 and A21.
Circuit F12 splices to feed the ABS control module,
EGR solenoid, Torque Converter Clutch (TCC) sole-
noid, leak detection pump, and the EVAP/Purge sole-
noid.
Circuit F12 also connects to a bus bar in the PDC.
The bus bar supplies voltage to the coil side of radi-
ator fan relay and A/C clutch relay, as well as the
fuel pump relay.
VEHICLE SPEED SENSOR
Circuit K7 supplies 8 volts from the Powertrain
Control Module (PCM) to the Vehicle Speed Sensor
(VSS). The K7 circuit connects to cavity 44 of the
PCM connector.
Circuit G7 from the VSS provides an input signal
to the PCM. The G7 circuit connects to cavity 66 of
the PCM connector.
The PCM provides ground for the VSS signal (cir-
cuit G7) through circuit K4. Circuit K4 connects to
cavity 43 of the PCM connector.
HELPFUL INFORMATION
Circuit G7 splices to the speedometer and odome-
ter in the instrument cluster.
Circuit K7 splices to supply 8 volts to the camshaft
position sensor and crankshaft position sensor.
Circuit K4 splices to supply ground for the signals
from the following:
²Upstream heated oxygen sensor
²Downstream heated oxygen sensor
PL8W - 30 FUEL/IGNITION SYSTEMS 8W - 30 - 15
DESCRIPTION AND OPERATION (Continued)

Downloaded from www.Manualslib.com manuals search engine WHEEL SPEED SENSORS
There are four wheel speed sensors, one at each
wheel. The sensors use a tone wheel to determine
wheel speed. Input to the Controller Anti Lock Brake
(CAB) is done on the following circuits. All of these
circuits are a twisted pair.
B8 and B9 for the left front wheel (cavity 8 and
cavity 9).
B6 and B7 for the right front wheel (cavity 6 and
cavity 7).
B3 and B4 for the left rear wheel (cavity 3 and cav-
ity 4).
B1 and B2 for the right rear wheel (cavity 1 and
cavity 2).
BRAKE SWITCH INPUT
Circuit L50 is an input to the Controller Anti Lock
Brake (CAB). The L50 connects to cavity 13 of the
CAB connector. Circuit L50 is spliced in with the
stop lamps and is used to provide the CAB with
information on when the brakes are being applied.
DATA LINK CONNECTOR
Circuit D21 is used for diagnostics of a fault with
the ABS system. It is spliced in with the Powertrain
Control Module (PCM) circuits and used as an output
from the Controller Anti Lock Brake (CAB). Circuit
D21 connects to cavity 51 of the CAB connector.
HELPFUL INFORMATION
²Check the 15 amp fuse located in cavity 10 of
the fuse block.
²Check the 40 amp fuse located in the PDC.
²Check for a good ground at the left headlamp
ground.
²Check the case ground on the CAB
²Refer to the appropriate section of the service
manual, or the Diagnostic Test Procedures Manual.
PL8W - 35 ANTI-LOCK BRAKES 8W - 35 - 7
DESCRIPTION AND OPERATION (Continued)