2000 DODGE NEON electrical

DATA LINK CONNECTOR
DESCRIPTION
The data link connector is located inside the vehi-
cle, under the instrument panel, left of the steering
column (Fig. 25).
OPERATION
The data link connector (diagnostic connector)
links the DRB scan tool with the powertrain control
module (PCM). Refer to On-Board Diagnostics in the
General Diagnosis section of this group.
FUEL INJECTORSÐPCM OUTPUT
DESCRIPTION
OPERATION
The 2.0L engine uses electrically operated top feed
fuel injectors (Fig. 26). The Automatic Shutdown
(ASD) relay supplies battery voltage to the fuel injec-
tors. The PCM controls the ground path for each
injector in sequence. By switching the ground paths
on and off, the PCM fine-tunes injector pulse width.
Injector pulse width refers to the amount of time an
injector operates.
The PCM determines injector synchronization from
the camshaft position sensor and crankshaft position
sensor inputs. The PCM grounds the ASD and fuel
pump relays after receiving the camshaft position
sensor and crankshaft position sensor inputs.
The PCM energizes the injectors in a sequential
order during all engine operating conditions except
start-up. For the first injector pulse width during
start-up, all injectors are energized at the same time.
Once the PCM determines crankshaft position, it
begins energizing the injectors in sequence.
IGNITION COILÐPCM OUTPUT
DESCRIPTION
The coil assembly consists of 2 coils molded
together. The coil assembly is mounted over the valve
cover (Fig. 27).
OPERATION
High tension leads route to each cylinder from the
coil. The coil fires two spark plugs every power
Fig. 24 Idle Air Control MotorÐTypical
Fig. 25 Data Link Connector
1 ± DATA LINK CONNECTOR
Fig. 26 Fuel Injector
1 ± FUEL INJECTOR
2 ± NOZZLE
3 ± TOP (FUEL ENTRY)
14 - 40 FUEL SYSTEMPL
DESCRIPTION AND OPERATION (Continued)

Control Module (PCM) receives data from the DRB
through the SCI Receive circuit.
TACHOMETERÐPCM OUTPUT
OPERATION
The PCM operates the tachometer on the instru-
ment panel. The PCM calculates engine RPM from
the crankshaft position sensor input. Sends the infor-
mation to the cluster across the bus.
TORQUE CONVERTOR CLUTCH SOLENOIDÐ
PCM OUTPUT
OPERATION
Three-speed automatic transaxles use a torque con-
verter clutch solenoid. The PCM controls the engage-
ment of the torque converter clutch through the
solenoid (Fig. 28). The torque converter clutch is
engaged up only in direct drive mode. Refer to the
Transmission section for information.
REMOVAL AND INSTALLATION
THROTTLE BODY
REMOVAL
(1) Disconnect the negative battery cable (Fig. 29).
(2) Remove the air cleaner box cover.
(3) Remove the air cleaner element (Fig. 30). Pull
up on element, past the lip in the box, to remove it
from the air cleaner box.
(4) Disconnect the electrical connection at the
throttle body.
(5) Loosen the clamp on throttle body outlet hose.(6) Remove the bolts holding the throttle body to
the air cleaner box (Fig. 31).
(7) Remove cable's from throttle body cam (Fig.
32).INSTALLATION
(1) Install cable's into throttle cam and clip cable's
into throttle cable bracket.
(2) Install throttle body onto air cleaner box.
Tighten mounting bolts.
(3) Install and tighten the clamp on throttle body
outlet hose.
(4) Connect the electrical connectors to the throttle
body.
Fig. 28 Torque Convertor Clutch Solenoid
1 ± TORQUE CONVERTOR CLUTCH SOLENOID
2 ± AUTOMATIC TRANSAXLE HOUSING
3 ± PARK/NEUTRAL SWITCH
Fig. 29 Battery Negative Cable
Fig. 30 Air Cleaner Element
1 ± LIP
14 - 42 FUEL SYSTEMPL
DESCRIPTION AND OPERATION (Continued)

(5) Install the air cleaner element, make sure that
the element is past the lip on the air cleaner box.
(6) Install the air cleaner box cover and tighten
the screws.
(7) Connect the negative battery cable.
THROTTLE POSITION SENSOR
REMOVAL
(1) Disconnect the negative battery cable.
(2) Loosen the clamp for the air duct at the throt-
tle body.
(3) Remove the mounting bolt and nut for the air
cleaner box.
(4) Pull the air cleaner box and throttle body up to
access the throttle position sensor.
(5) Remove the throttle position sensor.
INSTALLATION
(1) Install the throttle position sensor.
(2) Locate the air cleaner box and throttle body
and tighten the mounting bolt and nut.
(3) Install the air duct hose and tighten the clamp.
(4) Connect the negative battery cable.
IDLE AIR CONTROL MOTOR
When servicing throttle body components, always
reassemble components with new O-rings and seals
where applicable. Never use lubricants on O-rings or
seals, damage may result. If assembly of component
is difficult, use water to aid assembly. Use care when
removing hoses to prevent damage to hose or hose
nipple.
REMOVAL
(1) Disconnect negative cable from battery.
(2) Remove electrical connector from idle air con-
trol motor.
(3) Remove idle air control motor mounting screws
(Fig. 34).
(4) Remove motor from throttle body. Ensure the
O-ring is removed with the motor.
INSTALLATION
(1) The new idle air control motor has a new
O-ring installed on it. If pintle measures more than 1
inch (25 mm) it must be retracted. Use the DRB Idle
Air Control Motor Open/Close Test to retract the
pintle (battery must be connected.)
(2) Carefully place idle air control motor into
throttle body.
(3) Install mounting screws. Tighten screws to 4.5
N´m (40 in. lbs.) torque.
Fig. 31 Throttle body bolts
Fig. 32 Disconnecting Throttle Cable
Fig. 33 Transmission Kickdown Cable Connector
PLFUEL SYSTEM 14 - 43
REMOVAL AND INSTALLATION (Continued)

(4) Connect electrical connector to idle air control
motor.
(5) Connect negative cable to battery.
MAP SENSOR
The MAP sensor attaches to the intake manifold
plenum (Fig. 35).
REMOVAL
(1) Disconnect the electrical connector from the
MAP sensor.
(2) Remove sensor mounting screws.
(3) Remove sensor.
INSTALLATION
(1) Insert sensor into intake manifold while mak-
ing sure not to damage O-ring seal.(2) Tighten mounting screws to 4.5 N´m (40 in.
lbs.) torque for plastic manifold.
(3) Attach electrical connector to sensor.
POWERTRAIN CONTROL MODULE (PCM)
REMOVAL
(1) Disconnect the negative battery cable (Fig. 36).
(2) Remove the air cleaner box, refer to the air
cleaner box section.
(3) Remove the gray and black connector from the
PCM (Fig. 37).
(4) Remove the harness clip bracket from PCM
bracket (Fig. 38).
Fig. 34 Servicing Idle Air Control Motor
Fig. 35 MAP Sensor
Fig. 36 Battery Cable
Fig. 37 Powertrain Control Module (PCM)
1 ± PCM
14 - 44 FUEL SYSTEMPL
REMOVAL AND INSTALLATION (Continued)

INSTALLATION
New sensors have compound on the threads and do
not require an additional coating.
(1) Install sensor using an oxygen sensor crow foot
wrench such as Snap-On tool YA8875 or equivalent
(Fig. 41). Tighten the sensor to 28 N´m (20 ft. lbs.)
torque.
(2) Plug sensor connector.
(3) Lower vehicle.
DOWNSTREAM HEATED OXYGEN SENSOR 1/2
The downstream heated oxygen sensor threads into
the exhaust outlet pipe behind the catalytic convertor
(Fig. 42).
REMOVAL
(1) Raise vehicle.
(2) Disconnect electrical connector from harness.
(3) Disconnect sensor electrical harness from clips
along body.
(4) Remove sensor using an oxygen sensor crow
foot wrench such as Snap-On tool YA8875 or equiva-
lent (Fig. 43).
(5) After removing the sensor, the exhaust mani-
fold threads must be cleaned with an 18 mm X 1.5 +
6E tap. If reusing the original sensor, coat the sensor
threads with an anti-seize compound such as Loctitet
771-64 or equivalent.
INSTALLATION
New sensors have compound on the threads and do
not require an additional coating.
(1) Install sensor using an oxygen sensor crow foot
wrench such as Snap-On tool YA8875 or equivalent
(Fig. 43). Tighten the sensor to 28 N´m (20 ft. lbs.)
torque.
(2) Connect sensor electrical harness from clips
along body.
(3) Connect electrical connector to harness.
(4) Lower vehicle.
AIR CLEANER BOX
REMOVAL
(1) Remove 5 screws from air cleaner element box
lid.
(2) Remove lid from air cleaner box.
(3) Pull air cleaner up and out of air cleaner box
(Fig. 44).
(4) Move air duct out of the way.
(5) Remove the bolt and nut from the air cleaner
box.
(6) Remove wiring harness from the clips on the
air cleaner box.
(7) Remove the wiring clip from the front of the air
cleaner box.(8) Remove the 4 bolts from the air cleaner box to
throttle body.
(9) Pull air cleaner box up and off of stud and bat-
tery tray and remove from vehicle.
INSTALLATION
(1) Install air cleaner box. Make sure that it is on
the battery tray tab in the back and on the stud on
the side.
(2) Install the bolts to the throttle body and
tighten.
(3) Install the nut and bolt for air cleaner box and
tighten.
(4) Install the wiring clip in the front of the air
cleaner box.
Fig. 42 Downstream Heated Oxygen Sensor
1 ± CATALYTIC CONVERTOR
2 ± DOWNSTREAM OXYGEN SENSOR
Fig. 43 Downstream Heated Oxygen Sensor
Removal/Installation
1 ± DOWNSTREAM HEATED OXYGEN SENSOR
2 ± CATALYTIC CONVERTOR
14 - 46 FUEL SYSTEMPL
REMOVAL AND INSTALLATION (Continued)

(5) Install the wiring harness into the clips on the
side of the air cleaner box.
(6) Install air cleaner element on to throttle body
and push towards the throttle body and past lip in
air cleaner box bottom (Fig. 45).
(7) Install air duct.
(8) Install lid and tighten screws.
AIR CLEANER ELEMENT
REMOVAL
(1) Remove 5 screws from air cleaner element box
lid.(2) Remove lid from air cleaner box.
(3) Pull air cleaner up and out of air cleaner box.
INSTALLATION
(1) Install air cleaner element on to throttle body
and push towards the throttle body and past lip in
air cleaner box bottom (Fig. 46).
(2) Install lid and tighten screws.
ENGINE COOLANT TEMPERATURE SENSOR
The engine coolant temperature sensor threads
into the rear of the cylinder head (Fig. 47).
REMOVAL
(1) With the engine cold, drain coolant until level
drops below cylinder head. Refer to the Cooling Sys-
tem section.
(2) Disconnect coolant sensor electrical connector.
(3) Remove coolant sensor.
INSTALLATION
(1) Install coolant sensor. Tighten sensor to 18
N´m (165 in. lbs.) torque.
(2) Attach electrical connector to sensor.
(3) Fill cooling system. Refer to the Cooling Sys-
tem section.
VEHICLE SPEED SENSOR
The vehicle speed sensor is located in the transmis-
sion extension housing (Fig. 48) or (Fig. 49).
REMOVAL
(1) Disconnect electrical connector from sensor.
(2) Remove the sensor mounting bolt.
Fig. 44 Air Cleaner Box
Fig. 45 Air Cleaner Box Lip
1 ± LIP
Fig. 46 Air Cleaner Element
1 ± LIP
PLFUEL SYSTEM 14 - 47
REMOVAL AND INSTALLATION (Continued)

(3) Lift the sensor out of the transaxle extension
housing. Ensure the O-ring was removed with the
sensor.
INSTALLATION
The speed sensor gear meshes with a gear on the
output shaft.
(1) With O-ring in place, install sensor.
(2) Install mounting bolt.
(3) Connect electrical connector to sensor.
KNOCK SENSOR
The sensors screws into the cylinder block.
REMOVAL
(1) Raise vehicle on hoist and support.
(2) Disconnect electrical connector from knock sen-
sor (Fig. 50).
(3) Use a crows foot socket to remove the knock
sensors.
INSTALLATION
(1) Install knock sensor. Tighten knock sensor to
10 N´m (7 ft. lbs.) torque.Over or under tighten-
ing effects knock sensor performance resulting
in possible improper spark control.
(2) Attach electrical connector to knock sensor.
(3) Lower vehicle.
Fig. 47 Engine Coolant Temperature Sensor
1 ± ENGINE COOLANT TEMPERATURE SENSOR
2 ± CAMSHAFT POSITION SENSOR
Fig. 48 Vehicle Speed Sensor Manual
1 ± TRANSAXLE
2 ± SPEED SENSOR
3 ± SPEED SENSOR RETAINING BOLT
Fig. 49 Vehicle Speed Sensor Automatic
1 ± TRANSAXLE EXTENSION HOUSING
2 ± VEHICLE SPEED SENSOR
Fig. 50 Knock Sensor Location
14 - 48 FUEL SYSTEMPL
REMOVAL AND INSTALLATION (Continued)

(3) Install the hose clamp on the power steering
cooler fluid hose past the bead formed into the steel
fitting and secure in place.
(4) Install the two screws attaching the cooler to
the front suspension crossmember. Tighten the cooler
attaching screws to a torque of 10 N´m (90 in. lbs.).
(5) Install the power steering fluid return hose on
the power steering fluid cooler tube. Install the hose
clamp on the power steering return hose securing it
to the power steering cooler. Be sure the hose clamp
is installed on the return hose past the bead on the
end of the cooler tube.
(6) Lower the vehicle.
(7) Perform the POWER STEERING PUMP INI-
TIAL OPERATION service procedure which can be
found in the POWER STEERING PUMP section of
this group to properly fill and bleed the power steer-
ing system.
(8) Check for leaks at all connections.
POWER STEERING FLUID PRESSURE SWITCH
NOTE: Before proceeding with this removal and
installation procedure, review SERVICE WARNINGS
AND CAUTIONS at the beginning of REMOVAL AND
INSTALLATION in this section.
REMOVAL
(1) Disconnect negative battery cable from the neg-
ative post of the battery. Be sure cable is isolated
from negative post on battery.(2) Raise the vehicle. Refer to HOISTING in the
LUBRICATION AND MAINTENANCE group in this
service manual for the correct lifting procedure.
(3) Locate the power steering fluid pressure switch
on the back side of the power steering gear (Fig. 9).
(4) Remove the vehicle wiring harness connector
from the power steering fluid pressure switch.
NOTE: When removing and installing the power
steering pressure switch, use a 7/8 inch deep well
socket. The deep well socket will prevent damage
to the plastic electrical connector area of the power
steering fluid pressure switch.
(5) Unscrew and remove the power steering fluid
pressure switch from the power steering gear.
INSTALLATION
(1) By hand, screw the power steering pressure
switch into the power steering gear until it is fully
seated (Fig. 9). Tighten the power steering pressure
switch to a maximum torque of 8 N´m (70 in. lbs.).
Over-torquing will result in stripping the threads out
of the power steering pressure switch port in the
steering gear.
(2) Install the vehicle wiring harness connector. Be
sure the latch on the wiring harness connector is
fully engaged with the locking tab on the power
steering pressure switch.
(3) Lower the vehicle.
(4) Fill the power steering fluid reservoir to the
correct fluid level. Use only MopartPower Steering
Fluid, or equivalent.
(5) Connect the negative cable to the negative post
of the battery.
Fig. 8 Power Steering Fluid Cooler
1 ± POWER STEERING FLUID COOLER
2 ± TRANSAXLE
3 ± CLAMP
4 ± AIR DAM
5 ± CROSSMEMBER
Fig. 9 Switch Location
1 ± WIRING HARNESS CONNECTOR
2 ± POWER STEERING GEAR
3 ± POWER STEERING FLUID PRESSURE SWITCH
4 ± REAR OF FRONT SUSPENSION CROSSMEMBER
19 - 14 STEERINGPL
REMOVAL AND INSTALLATION (Continued)