1997 DODGE NEON Speed sensor

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Instrument Cluster....................8W-40
Instrument Panel Speakers..............8W-47
Intermittent Wipe/Wash Switch...........8W-53
Key-In Switch........................8W-40
Knock Sensor.........................8W-30
License Lamps........................8W-51
Low Oil Pressure Lamp.................8W-40
Map/Reading Lamps...................8W-44
Master Power Window Switch............8W-60
Mercury Switch.......................8W-44
Noise Supressor.......................8W-30
Park Brake Switch.....................8W-40
Park/Neutral Position Switch.............8W-51
Park/Turn Signal Lamps................8W-52
Passenger Side Airbag..................8W-43
Power Distribution Center...............8W-10
Power Folding Mirror Relay..............8W-62
Power Mirror Fuse Holder...............8W-62
Power Mirror Switch...................8W-62
Power Mirrors........................8W-62
Power Steering Pressure Switch..........8W-30
Power Sunroof Motor...................8W-64
Power Window Motors..................8W-60
Power Window Switches.................8W-60
Powertrain Control Module..............8W-30
PRNDL Lamp........................8W-44
Pump Motor Driver....................8W-35
Radiator Fan Motor....................8W-42Component Page
Radio...............................8W-47
Rear Fog Lamp Switch..................8W-51
Rear Window Defogger..................8W-48
Rear Window Defogger Switch............8W-48
Repeater Lamps....................8W-50, 52
Seat Belt Warning Lamp................8W-40
Solid State Fan Relay..................8W-42
Speakers............................8W-47
Splice Information.....................8W-30
Stop Lamp Switch.....................8W-30
Sunroof Slide Switch...................8W-64
Sunroof Vent Switch....................8W-64
Switch Illumination....................8W-48
Tail/Stop Lamps.......................8W-51
Throttle Position (TP) Sensor.............8W-30
Torque Converter Clutch Solenoid.........8W-30
Trunk Lamp..........................8W-44
Trunk Switch.........................8W-44
Turn Indicator Lamps..................8W-40
Turn Signal Lamps....................8W-52
Turn Signal/Hazard Switch..............8W-52
Underhood Lamp......................8W-44
Vapor Canister Leak Detector............8W-30
Vehicle Speed Sensor...................8W-30
Visor/Vanity Lamps....................8W-44
Wheel Speed Sensors...................8W-35
Windshield Washer Pump Motor..........8W-53
Wipe/Wash Switch.....................8W-53
Wiper Motor..........................8W-53
8W - 02 - 2 8W - 02 COMPONENT INDEXPL
SPECIAL TOOLS (Continued)

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INDEX
page
SCHEMATICS AND DIAGRAMS........................................................... 1
DESCRIPTION AND OPERATION......................................................... 14
Component Page
A/C Compressor Clutch Relay..........8W-30-11
A/C High Pressure Switch.............8W-30-11
Airbag Control Module................8W-30-4
Automatic Shut Down Relay..........8W-30-2, 3
Battery Temperature Sensor..........8W-30-3, 7
Camshaft Position Sensor...........8W-30-7, 13
Controller Anti-Lock Brake..........8W-30-4, 12
Crankshaft Position Sensor..........8W-30-7, 13
Data Link Connector................8W-30-2, 4
Downstream Heated Oxygen Sensor......8W-30-3
Duty Cycle Evap/Purge Solenoid.........8W-30-9
EGR Transducer Solenoid..............8W-30-9
Engine Coolant Temperature Sensor......8W-30-7
Fuel Injector No. 1...................8W-30-5
Fuel Injector No. 2...................8W-30-5
Fuel Injector No. 3...................8W-30-5
Fuel Injector No. 4...................8W-30-5
Fuel Pump Module..................8W-30-10
Fuel Pump Relay....................8W-30-10
Fuse 5 (FB)........................8W-30-12
Fuse 10 (FB).....................8W-30-9, 10
Fuse 10 (FB)........................8W-30-9
Fuse 21 (PDC)................8W-30-2, 3, 4, 10
Fuse 25 (PDC)......................8W-30-12
Fuse Block....................8W-30-9, 10, 12
G101..............................8W-30-3
G102.........................8W-30-2, 4, 12
G106..............................8W-30-2
G303.............................8W-30-10
Generator.........................8W-30-11
IAT/MAP Sensor.....................8W-30-6
Idle Air Control Motor.................8W-30-8
Ignition Coil Pack....................8W-30-5
Immobilizer Engine Sensor............8W-30-13
Immobilizer Sensor..............8W-30-3, 8, 13
Instrument Cluster...........8W-30-7, 8, 10, 11Component Page
Knock Sensor.......................8W-30-6
Noise Supressor.....................8W-30-5
Park/Neutral Position Switch..........8W-30-12
Power Distribution Center....8W-30-2, 3, 4, 10, 12
Power Steering Pressure Switch.........8W-30-4
Powertrain Control
Module . 8W-30-2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13
S101.............................8W-30-12
S102..............................8W-30-4
S104...........................8W-30-2, 12
S104............................8W-30-2, 4
S105............................8W-30-2, 4
S106.............................8W-30-12
S107..............................8W-30-3
S109...........................8W-30-9, 10
S110 ......................8W-30-3, 6, 7, 8, 13
S118 ..........................8W-30-3, 7, 8
S119 ..............................8W-30-3
S120........................8W-30-3, 6, 7, 8
S121..............................8W-30-5
S122..........................8W-30-2, 3, 5
S123.............................8W-30-13
S123............................8W-30-7, 8
S124..............................8W-30-6
S126..............................8W-30-9
S127..............................8W-30-3
S129.............................8W-30-13
S134..............................8W-30-5
S211 .............................8W-30-12
Solid State Fan Relay................8W-30-11
Stop Lamp Switch...................8W-30-12
Throttle Position Sensor...............8W-30-6
Torque Converter Clutch Solenoid........8W-30-9
Upstream Heated Oxygen Sensor........8W-30-3
Vapor Canister Leak Detector...........8W-30-9
Vehicle Speed Sensor...............8W-30-8, 13
8W - 30 - 2 8W - 30 FUEL/IGNITION SYSTEMSPL

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VEHICLE
SPEED
SENSOR
13 SENSOR
GROUND8V
SUPPLY
K4
18
BK/LB
K4
18
BK/LB
K4
20
BK/LB
S118
S120
S123
K7
18
OR
K7
18
OR
G7
18
WT/OR
2C160
5C16110
C14344C1
S110
K4
20
BK/LB
K4
20
BK/LB
K7
20
OR
1324
MOTOR CONTROL
AIR
IDLE
4732
57C1 C148C149C158
IDLE
AIR
CONTROL
MOTOR
DRIVER
NO. 4 NO. 2DRIVERMOTOR CONTROLAIR IDLE
NO. 3 DRIVERMOTOR CONTROLAIR IDLE
NO. 1 DRIVERMOTOR CONTROLAIR IDLE
5C103 C1
10
CLUSTER INSTRUMENT
G7
20
WT/OR
G7
22
WT/OR
G7
20
WT/OR
C166
VEHICLE
SPEED
SENSOR
SIGNAL SENSOR
GROUND8V
SUPPLYVEHICLE
SPEED
SENSOR
SIGNAL
K59
18
VT
K59
20
VT
K60
18
YL/BK
K60
20
YL/BK
K40
18
BR/WT
K40
20
BR/WT
K39
18
GY/RD
K39
20
GY/RD
MODULE CONTROL
POWERTRAIN
AIR
CONTROL
MOTOR
NO. 4IDLE IDLE
NO. 2 MOTOR CONTROLAIR AIR
CONTROL
MOTOR
NO. 3IDLE IDLE
NO. 1 MOTOR CONTROLAIR
3
SENSOR IMMOBILIZERK7
20
OR
(8W-70-2)
(8W-70-2) (8W-30-13)
(8W-30-3)(8W-40-3)
(8W-30-13)
8W - 30 - 8 8W-30 FUEL/IGNITION SYSTEMPL-RHD
978W-1PLR03007

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SENSOR ENGINE
IMMOBILIZER
1
34
2
IMMOBILIZER
SENSOR
K241
20
GY/BK
K241
20
GY/BK
K240
20
GY
S129
C1
4443C1
MODULE CONTROL
POWERTRAIN
K7
20
OR
K4
20
BK/LB
K4
20
BK/LB
S110
8V
SUPPLY GROUNDSENSOR
S123
K7
20
OR
K7
18
OR
5C161
CAMSHAFT
POSITION
SENSORVEHICLE
SPEED
SENSOR
11
CRANKSHAFT
POSITION
SENSOR
1
K7
20
ORK7
18
ORK7
20
OR
(8W-30-3)
(8W-30-7) (8W-30-8) (8W-30-7)
PL-RHD8W-30 FUEL/IGNITION SYSTEM 8W - 30 - 13
PLR03012978W-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 ²Crankshaft position sensor
²Camshaft position sensor
²Battery temperature sensor
²Throttle position sensor
²Manifold absolute pressure sensor
²Engine coolant temperature sensor
²Knock sensor
²Intake air temperature sensor
HEATED OXYGEN SENSORS
Circuit A14 is a bus bar in the Power Distribution
Center (PDC), and connects to battery voltage. The
contact side of the Automatic Shut Down (ASD) relay
connects circuit A14 and circuit A142. A 20 amp fuse
in the PDC protects circuits A14 and A142.
Circuit A14 also supplies voltage to the coil side of
the ASD relay. The Powertrain Control Module
(PCM) controls the ground path circuit for the coil
side of the ASD relay on circuit K51. Circuit K51 con-
nects to cavity 67 of the PCM connector.
Circuit A142 splices to supply voltage for the
upstream and downstream heated oxygen sensors.
The A142 circuit also splices to cavity 6 of the
PCM. The input provided by circuit A142 at cavity 6
tells the PCM that the ASD relay energized.
Circuit K41 delivers the signal from the upstream
heated oxygen sensor to the PCM. Circuit K41 con-
nects to cavity 30 of the PCM connector.
Circuit K141 delivers the signal from the down-
stream heated oxygen sensor to the PCM. Circuit
K141 connects to cavity 51 of the PCM connector.
The PCM provides a ground for the upstream and
downstream heated oxygen sensor signals (circuit
K41 and K141) through circuit K4. Circuit K4 con-
nects to cavity 43 of the PCM connector.
Circuit Z1 provides ground for the heater circuits
in each sensor. Circuit Z1 terminates at the left side
of the radiator closure panel.
HELPFUL INFORMATION
Circuit A142 splices to supply voltage to the fuel
injectors, ignition coil, ASD relay, generator, and the
upstream and downstream heated oxygen sensors.
The PCM controls the ground circuit for each of the
components powered by circuit A142.
CRANKSHAFT POSITION SENSOR
Circuit K7 supplies 8 volts from the Powertrain
Control Module (PCM) to the crankshaft position
sensor. The K7 circuit connects to cavity 44 of the
PCM connector.
Circuit K24 from the sensor provides an input sig-
nal to the PCM. The K24 circuit connects to cavity 32
of the PCM connector.
The PCM provides ground for the crankshaft position
sensor signal (circuit K24) through circuit K4. Circuit
K4 connects to cavity 43 of the PCM connector.
HELPFUL INFORMATION
Circuit K7 splices to supply 8 volts to the camshaft
position sensor and vehicle speed sensor.
Circuit K4 splices to supply ground for the signals
from the following:
²Upstream heated oxygen sensor
²Downstream heated oxygen sensor
²Camshaft position sensor
²Battery temperature sensor
²Throttle position sensor
²Manifold absolute pressure sensor
²Engine coolant temperature sensor
²Knock sensor
²Intake air temperature sensor
²Vehicle speed sensor
CAMSHAFT POSITION SENSOR
Circuit K7 supplies 8 volts from the Powertrain
Control Module (PCM) to the camshaft position sen-
sor. The K7 circuit connects to cavity 44 of the PCM
connector.
Circuit K44 from the sensor provides an input sig-
nal to the PCM. The K44 circuit connects to cavity 33
of the PCM connector.
The PCM provides ground for the camshaft posi-
tion sensor signal (circuit K44) through circuit K4.
Circuit K4 connects to cavity 43 of the PCM connec-
tor.
HELPFUL INFORMATION
Circuit K7 splices to supply 8 volts to the camshaft
position sensor and vehicle speed sensor.
Circuit K4 splices to supply ground for the signals
from the following:
²Upstream heated oxygen sensor
²Downstream heated oxygen sensor
²Crankshaft position sensor
²Battery temperature sensor
²Throttle position sensor
²Manifold absolute pressure sensor
²Engine coolant temperature sensor
²Knock sensor
²Intake air temperature sensor
²Vehicle speed sensor
ENGINE COOLANT TEMPERATURE SENSOR
The engine coolant temperature sensor provides an
input to the Powertrain Control Module (PCM) on
circuit K2. The sensor also operates the engine cool-
ant temperature gauge in the instrument cluster on
circuit G20. Refer to Section 8W-40 for coolant tem-
perature gauge circuit description.
From circuit K2 the engine coolant temperature
sensor draws up to 5 volts from the PCM. The sensor
is a variable resistor. As coolant temperature
changes, the resistance in the sensor changes causing
8W - 30 - 16 8W - 30 FUEL/IGNITION SYSTEMSPL
DESCRIPTION AND OPERATION (Continued)

Downloaded from www.Manualslib.com manuals search engine a change in current draw. The K2 circuit connects to
cavity 26 of the PCM connector.
The PCM provides ground for the engine coolant
temperature sensor signal (circuit K2) through circuit
K4. Circuit K4 connects to cavity 43 of the PCM con-
nector.
HELPFUL INFORMATION
The engine coolant temperature sensor is case
grounded. The case ground provides the ground for
the coolant temperature gauge circuit G20.
Circuit K4 splices to supply ground for the signals
from the following:
²Upstream heated oxygen sensor
²Downstream heated oxygen sensor
²Camshaft position sensor
²Crankshaft position sensor
²Battery temperature sensor
²Throttle position sensor
²Manifold absolute pressure sensor
²Knock sensor
²Intake air temperature sensor
²Vehicle speed sensor
THROTTLE POSITION SENSOR
From the Powertrain Control Module (PCM), cir-
cuit K6 supplies 5 volts to the Throttle Position Sen-
sor (TPS). Circuit K6 connects to cavity 61 of the
PCM connector.
Circuit K22 delivers the TPS signal to the PCM.
Circuit K22 connects to cavity 35 of the PCM connec-
tor.
The PCM provides ground for the TPS signal (cir-
cuit K22) through circuit K4. Circuit K4 connects to
cavity 43 of the PCM connector.
HELPFUL INFORMATION
Refer to Group 14 for TPS operation.
Circuit K6 splices to supply 5 volts to the Manifold
Absolute Pressure (MAP) sensor.
Circuit K4 splices to supply ground for the signals
from the following:
²Upstream heated oxygen sensor
²Downstream heated oxygen sensor
²Battery temperature sensor
²Camshaft position sensor
²Crankshaft position sensor
²Engine coolant temperature sensor
²Manifold absolute pressure sensor
²Knock sensor
²Intake air temperature sensor
²Vehicle speed sensor
MANIFOLD ABSOLUTE PRESSURE SENSOR
From the Powertrain Control Module (PCM), cir-
cuit K6 supplies 5 volts to the Manifold AbsolutePressure (MAP) sensor. Circuit K6 connects to cavity
61 of the PCM connector.
Circuit K1 delivers the MAP signal to the PCM. Cir-
cuit K1 connects to cavity 36 of the PCM connector.
The PCM provides ground for the MAP sensor sig-
nal (circuit K1) through circuit K4. Circuit K4 con-
nects to cavity 43 of the PCM connector.
HELPFUL INFORMATION
Refer to Group 14 for MAP sensor operation.
Circuit K6 splices to supply 5 volts to the Throttle
Position Sensor.
Circuit K4 splices to supply ground for the signals
from the following:
²Upstream heated oxygen sensor
²Downstream heated oxygen sensor
²Battery temperature sensor
²Camshaft position sensor
²Crankshaft position sensor
²Engine coolant temperature sensor
²Throttle position sensor
²Knock sensor
²Intake air temperature sensor
²Vehicle speed sensor
INTAKE AIR TEMPERATURE SENSOR
The intake air temperature sensor provides an
input to the Powertrain Control Module (PCM) on
circuit K21. Circuit K21 connects to cavity 37 of the
PCM connector.
From circuit K21 the intake air temperature sen-
sor draws voltage from the PCM. The sensor is a
variable resistor. As intake air temperature changes,
the resistance in the sensor changes causing a
change in current draw.
The PCM provides ground for the intake air temper-
ature sensor signal (circuit K21) through circuit K4. Cir-
cuit K4 connects to cavity 43 of the PCM connector.
HELPFUL INFORMATION
Circuit K4 splices to supply ground for the signals
from the following:
²Upstream heated oxygen sensor
²Downstream heated oxygen sensor
²Battery temperature sensor
²Camshaft position sensor
²Crankshaft position sensor
²Engine coolant temperature sensor
²Throttle position sensor
²Knock sensor
²Manifold absolute pressure sensor
²Vehicle speed sensor
KNOCK SENSOR
The knock sensor provides an input to the Power-
train Control Module (PCM) on circuit K42. Circuit
K42 connects to cavity 24 of the PCM connector.
PL8W - 30 FUEL/IGNITION SYSTEMS 8W - 30 - 17
DESCRIPTION AND OPERATION (Continued)