1999 DODGE NEON check engine

OVERSHOOT/UNDERSHOOT FOLLOWING SPEED
CONTROL SET
If the operator repeatedly presses and releases the
set button with their foot off of the accelerator (a ªlift
foot setº to begin speed control operation), the vehicle
may accelerate and exceed the desired set speed by
up to 5 MPH (8 km/h) and then decelerate to less
than the desired set speed before finally achieving
the desired set speed.
The Speed Control has an adaptive strategy that
compensates for vehicle-to-vehicle variations in speed
control cable lengths. When the speed control is set
with the vehicle operators foot off of the accelerator
pedal, the speed control thinks there is excessive
speed control cable slack and adapts. If the lift foot
sets are continually used, the speed control over-
shoot/undershoot condition will develop.
To ªunlearnº the overshoot/undershoot condition,
the vehicle operator has to press and release the set
button while maintaining the desired set speed with
the accelerator pedal (not decelerating or accelerat-
ing), and then turn the cruise control switch to the
OFF position (or press the CANCEL button if
equipped) after waiting 10 seconds. This procedure
must be performed approximately 10±15 times to
completely unlearn the overshoot/undershoot condi-
tion.
SERVO VACUUM TEST
(1) Turn ignition switch to the ON position with-
out starting engine. Activate speed control ON
switch.
(2) Disconnect the four-way electrical connector
and the vacuum harness at the servo (Fig. 5).
(3) Connect a jumper wire from Pin 3 of the servo
to Pin 3 of the wire connector.
(4) Ground Pins 2 and 4 in the servo. Do not con-
nect pin 1.
(5) Connect a hand held vacuum pump to the vac-
uum nipple and apply 10 - 15 inches of vacuum.
(6) If servo pulls cable, replace servo.
(7) Ground Pin 1 on servo.
(8) Check that the throttle cable pulls in and holds
as long as the vacuum pump is connected. After one
minute, check if cable is still holding. If cable does
not hold replace the servo.
(9) Disconnect jumper from pin 3. Cable should
return to rest position. If not, replace servo.
(10) Connect 4 way electrical connector and vac-
uum harness to servo.
SPEED CONTROL SWITCH TEST
Refer to the appropriate Powertrain Diagnostic
Manual for switch test valves.
STOP LAMP SWITCH TEST
(1) Remove the stop lamp switch refer to Stop
Switch Removal/Installation in this section. Discon-
nect connector from stop lamp switch (Fig. 6). Using
an ohmmeter, switch continuity may be checked as
follows:
(2) With switch plunger released, there should be
continuity between Pin 5 and Pin 6.
(3) With switch plunger depressed, there should be
continuity:
²Between Pin 1 and Pin 2.
²Between Pin 3 and Pin 4.
(4) If the above results are not obtained, the stop
lamp switch is defective or out of adjustment.
Fig. 5 Servo Harness Connector
Fig. 6 Stop Lamp Wiring
8H - 6 VEHICLE SPEED CONTROL SYSTEMPL
DIAGNOSIS AND TESTING (Continued)

(c) If continuity is OK between cavity 62 and
cavity 1, repair open circuit between cavity 2 of the
stop lamp switch connector and ground.
(6) Using an ohmmeter, check continuity from cav-
ity 76 on PCM connector to ground with the trans-
mission in park or neutral. If no continuity, test TRS/
Park-Neutral switch and switch wiring
(7) Turn speed control and ignition switch OFF.
(8) Unplug the BLACK 40-way connector from the
Powertrain Control Module (PCM)
(9) Using an ohmmeter, check continuity from cav-
ity 3 of servo connector to cavity 5 on the PCM con-
nector.
(a) If continuity is OK, replace PCM. Check cir-
cuit for short to ground before replacing PCM.
(b) If no continuity, remove stop lamp switch
and conduct Stop Lamp Switch Test. If test fails,
adjust or replace as necessary.
(c) If switch passes, measure continuity from
cavity 4 of stop lamp switch connector to cavity 3
of servo connector. Repair open circuit if necessary.
(d) If continuity is OK, measure continuity from
cavity 3 of stop lamp switch to cavity 5 of PCM
connector. Repair open circuit as necessary.
(e) Install PCM connectors onto PCM and speed
control servo connector to servo.
VACUUM SUPPLY TEST
(1) Disconnect vacuum hose at the servo and
install a vacuum gauge in the hose (Fig. 9).
(2) Start engine and observe gauge at idle. Vac-
uum gauge should read at least ten inches of mer-
cury. Shut off engine, the vacuum should continue to
hold 10 inches of mercury.
(3) If vacuum does not meet this requirement,
check and correct the following vacuum leaks in the
vacuum lines, check valve, vacuum reservoir or poor
engine performance.
VEHICLE SPEED SENSOR
For diagnosis and testing of the Vehicle Speed Sen-
sor (VSS), refer to the appropriate Powertrain Diag-
nostic Procedures service manual. Also refer to the
DRB scan tool.
REMOVAL AND INSTALLATION
SPEED CONTROL SERVO
REMOVAL
(1) Disconnect electrical connector from servo.
(2) Disconnect vacuum hoses from servo
(3) Remove 2 nuts retaining cable to servo.
(4) Remove hair pin holding cable to servo.
INSTALLATION
(1) Install hairpin to cable at servo.
(2) Install 2 nuts at cable to servo and servo
bracket, tighten to 7 N´m (60 ins. lbs.).
(3) Connect electrical connector to servo.
(4) Connect vacuum hose to servo
SPEED CONTROL SWITCH
The speed control switches are mounted in the
steering wheel and wired through the clock spring
device under the airbag module (Fig. 1).
WARNING: IF REMOVAL OF AIRBAG MODULE IS
NECESSARY, REFER TO GROUP 8M, RESTRAINT
SYSTEMS.
REMOVAL
(1) Turn off ignition.
(2) Remove two screws from side of each switch.
(3) Rock switch away from airbag and steering
wheel.
(4) Disconnect two-way electrical connector.
(5) Repeat for the other switch.
INSTALLATION
For installation reverse above procedures.
STOP LAMP SWITCH
REMOVAL
Remove the switch from the bracket by depressing
the brake pedal and rotating the switch in a counter-
clockwise direction approximately 30 degrees. Pull
the switch rearward and remove from bracket. Dis-
connect wiring harness connector.
INSTALLATION
Before installing the switch, reset the adjustable
switch plunger by pulling on the plunger head until
Fig. 9 Vacuum Gauge TestÐTypical
8H - 8 VEHICLE SPEED CONTROL SYSTEMPL
DIAGNOSIS AND TESTING (Continued)

parking lamps out put. Press the panic button and
check for a voltage pulse (Fig. 2).
(2) If no voltage pulse is measured, replace the
receiver. If voltage OK, repair circuit to the parking
lamps as necessary.
(3) Connect the meter to Pin 5 of the black connec-
tor and to ground to test head lamps out put. Press
the panic button and check for a voltage pulse (Fig.
2).
(4) If no voltage pulse is measured, replace the
receiver. If voltage OK, repair circuit to the head
lamps as necessary.
REMOTE KEYLESS ENTRY SYSTEM
When trouble shooting problems with the Remote
Keyless Entry System, always verify that the power
door lock/unlock switches are functional. If the doors
do not lock/unlock refer to Group 8W, Wiring Dia-
gram for Pin and wiring locations.
If the following items do not work:
²Remote keyless entry system
²Radio/clock
²Door lock switches
A blown fuse is the probable cause. Check fuses 2,
3 and 11 in the fuse block. To check for a blown fuse,
pull the fuse out slightly, but maintain contact
between the fuse terminals and the terminals in fuse
block. Using the voltmeter probe, check both termi-
nals for 12 volts. If only one terminal measures bat-
tery voltage, the circuit breaker is defective and must
be replaced. If neither terminal measures battery
voltage, check the high current fuses 3 and 11 in the
Power Distribution Center (PDC). The PDC is located
in the engine compartment. If fuse(s) are NOT OK,
replace fuse(s) or repair as necessary. If fuses are
OK, check for an open or shorted circuit to the Power
Distribution Center, repair as needed.
SERVICE PROCEDURES
HORN CHIRP CANCELLATION
During the programming operation the horn chirp
can be disabled or enable using the following proce-
dure. One or both transmitters can be program to be
disabled or enable.
(1) Retrieve the programming line from the upper
edge of the passenger side cowl trim panel upper
edge. The RKE Programming Line is a green wire
with a red bullet connector.
(2) Using a jumper wire, ground the RKE pro-
gramming line.
(3) Turn ignition switch to the ON position.
(4) Press any button on the transmitter. The locks
will cycle to confirm programming,
(5) To disable or enable horn chirp press the lock
button on the transmitter four times and the hornwill sound to confirm programming. Press the lock
button on the second transmitter four times and the
horn will sound to confirm programming.
(6) Disconnect the programming line from ground.
This returns the system to its normal operation
mode.
(7) Replace any removed components. Return pro-
gramming line chirpto its original position. Check for
system operation.
PANIC FUNCTION CANCELLATION
During the programming operation the panic func-
tion can be disabled or enable using the following
procedure. One or both transmitters can be program
to be disabled or enable.
(1) Retrieve the programming line from the upper
edge of the passenger side cowl trim panel. The RKE
Program Line is a green wire with a red bullet con-
nector.
(2) Using a jumper wire, ground the RKE Pro-
gramming Line.
(3) Turn ignition switch to the ON position.
(4) Press any button on the transmitter. The locks
will cycle to confirm programming,
(5) To disable or enable panic function press the
panic button on the transmitter four times and the
horn will sound to confirm programming. Press the
panic button on the second transmitter four times
and the horn will sound to confirm programming.
(6) Disconnect the programming line from ground.
This returns the system to its normal operation
mode.
(7) Replace any removed components. Return the
programming line to its original position. Check for
system operation.
PROGRAM REMOTE KEYLESS ENTRY MODULE
(1) Retrieve the programming line from the upper
edge of the passenger side cowl trim panel. The RKE
Programming Line is a green wire with a red bullet
connector.
(2) Using a jumper wire, ground the RKE pro-
gramming line.
(3) Turn ignition switch to the ON position.
(4) Press any button on the transmitter to set
code. The locks will cycle to confirm programming. If
there is a second transmitter it must be set at this
time. Press any button on the second transmitter and
wait for the locks to cycle to confirm programming.
(5) Disconnect the programming line from ground.
This returns the system to its normal operation
mode.
(6) Replace all removed components. Return pro-
gramming line to its original position. Check for sys-
tem operation.
PLPOWER DOOR LOCKS 8P - 5
DIAGNOSIS AND TESTING (Continued)

TERMINOLOGY
This a list of terms with there definitions used in
the wiring diagrams.
Built-Up-Export...........Vehicles Built For Sale
In Markets Other Than North America
Except-Built-Up-Export.....Vehicles Built For Sale
In North America
LHD..................Left Hand Drive Vehicles
RHD.................Right Hand Drive Vehicles
ATX . . . .Automatic Transmission-Front Wheel Drive
MTX .....Manual Transmission-Front Wheel Drive
AT......Automatic Transmission-Rear Wheel Drive
MT .......Manual Transmission-Rear Wheel Drive
SOHC............Single Over Head Cam Engine
DOHC.............Dual Over Head Cam Engine
CONNECTOR INFORMATION
CAUTION: Not all connectors are serviced. Some
connectors are serviced only with a harness. A typ-
ical example might be the Supplemental Restraint
System connectors. Always check parts availability
before attempting a repair.
IDENTIFICATION
In-line connectors are identified by a number, as
follows:
²In-line connectors located on theengine com-
partment harnessareC100series numbers.
²Connectors located on theinstrument panel
harnessareC200series numbers.
²Connectors located on thebody harnessare
C300series numbers.
²Jumper harness connectorsareC400series
numbers.
²Grounds and ground connectorsare identi-
fied with aªGºand follow the same series number-
ing as the in-line connector.
Component connectors are identified by the compo-
nent name instead of a number (Fig. 2). Multiple
connectors on a component use a C1, C2, etc. identi-
fier (Fig. 3).
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.
NOTES, CAUTIONS, and WARNINGS
Throughout this group additional important infor-
mation is presented in three ways; Notes, Cautions,
and Warnings.
NOTESare used to help describe how switches or
components operate to complete a particular circuit.
They are also used to indicate different conditions
that may appear on the vehicle. For example, an
up-to and after condition.
CAUTIONSare used to indicate information that
could prevent making an error that may damage the
vehicle.
WARNINGSprovide information to prevent per-
sonal injury and vehicle damage. Below is a list of
general warnings that should be followed any time a
vehicle is being serviced.
WARNING: ALWAYS WEAR SAFETY GLASSES FOR
EYE PROTECTION.
WARNING: USE SAFETY STANDS ANYTIME A PRO-
CEDURE REQUIRES BEING UNDER A VEHICLE.
Fig. 2 Component Identification
Fig. 3 Connector Identification
PL8W - 01 GENERAL INFORMATION 8W - 01 - 7
DESCRIPTION AND OPERATION (Continued)

WARNING: BE SURE THAT THE IGNITION SWITCH
ALWAYS IS IN THE OFF POSITION, UNLESS THE
PROCEDURE REQUIRES IT TO BE ON.
WARNING: SET THE PARKING BRAKE WHEN
WORKING ON ANY VEHICLE. AN AUTOMATIC
TRANSMISSION SHOULD BE IN PARK. A MANUAL
TRANSMISSION SHOULD BE IN NEUTRAL.
WARNING: OPERATE THE ENGINE ONLY IN A
WELL-VENTILATED AREA.
WARNING: KEEP AWAY FROM MOVING PARTS
WHEN THE ENGINE IS RUNNING, ESPECIALLY THE
FAN AND BELTS.
WARNING: TO PREVENT SERIOUS BURNS, AVOID
CONTACT WITH HOT PARTS SUCH AS THE RADIA-
TOR, EXHAUST MANIFOLD(S), TAIL PIPE, CATA-
LYTIC CONVERTER, AND MUFFLER.
WARNING: DO NOT ALLOW FLAME OR SPARKS
NEAR THE BATTERY. GASES ARE ALWAYS
PRESENT IN AND AROUND THE BATTERY.
WARNING: ALWAYS REMOVE RINGS, WATCHES,
LOOSE HANGING JEWELRY, AND LOOSE CLOTH-
ING.
TAKE OUTS
The abbreviation T/O is used in the component
location section to indicate a point in which the wir-
ing harness branches out to a component.
ELECTROSTATIC DISCHARGE (ESD) SENSITIVE
DEVICES
All ESD sensitive components are solid state and a
symbol (Fig. 4) is used to indicate this. When han-
dling any component with this symbol comply with
the following procedures to reduce the possibility of
electrostatic charge build up on the body and inad-
vertent discharge into the component. If it is not
known whether the part is ESD sensitive, assume
that it is.
(1) Always touch a known good ground before han-
dling the part. This should be repeated while han-
dling the part and more frequently after sliding
across a seat, sitting down from a standing position,
or walking a distance.
(2) Avoid touching electrical terminals of the part,
unless instructed to do so by a written procedure.(3) When using a voltmeter, be sure to connect the
ground lead first.
(4) Do not remove the part from its protective
packing until it is time to install the part.
(5) Before removing the part from its package,
ground the package to a known good ground on the
vehicle.
DIAGNOSIS AND TESTING
TROUBLESHOOTING TOOLS
When diagnosing a problem in an electrical circuit
there are several common tools necessary. These tools
are listed and explained below.
²Jumper Wire - This is a test wire used to con-
nect two points of a circuit. It can be used to bypass
an open in a circuit.
WARNING: NEVER USE A JUMPER WIRE ACROSS
A LOAD, SUCH AS A MOTOR, CONNECTED
BETWEEN A BATTERY FEED AND GROUND.
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 rating.
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 rating. In addition,
make sure the power is disconnected from the cir-
cuit. Circuits that are powered up by the vehicle
electrical system can cause damage to the equip-
ment and provide false readings.
Fig. 4 Electrostatic Discharge Symbol
8W - 01 - 8 8W - 01 GENERAL INFORMATIONPL
DESCRIPTION AND OPERATION (Continued)

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
1
2
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
PULSE
CONTROLA/C
COMPRESSOR
CLUTCH
RELAY
CONTROLGENERATOR
FIELD
DRIVER
MODULE CONTROL
POWERTRAIN (IN PDC) RELAY
CLUTCH
COMPRESSOR
A/C
A/C
SWITCH
SIGNAL
RELAY
CONTROL CHECK
ENGINE
LAMP TACHOMETER GENERATOR
LAMP
36
(8W-40-5)
(8W-40-6)
(8W-40-8)
(8W-42-5)
(8W-42-5)
(8W-20-2) (8W-42-2)
8W - 30 - 12 8W-30 FUEL/IGNITION SYSTEMPL
J988W-18259

ST-RUN A21FUEL
LEVEL
SENSOR
SIGNAL
INSTRUMENT
CLUSTER
G5
20
DB/WT
G5
20
DB/WT
G5
20
DB/WT
G20
22
VT/YL
G20
20
VT/YL
G20
20
VT/YL
G4
20
DB
Z3
16
BK/OR
Z3
14
BK/OR
G6
22
GY
G6
20
GY
G6
18
GY
S201
SWITCH PRESSURE
OIL
ENGINE
S219BLOCK FUSE
G4
20
DB
G204
8C161
4C103
1C28C1
5C230
3C160
23
10C25C1
1
11
31
POWERTRAIN
CONTROL
MODULE
FUEL
PUMP
MODULESENSOR TEMPERATURE
COOLANT
ENGINE
3G4
18
DB
C1609
C10311
BK/PK20 G3
BK/PK22 G3
BK/PK20 G3
MODULE CONTROL
POWERTRAIN
8
3C2
CHECK
ENGINE
LAMP
DRIVER
3
6
C160
7C103
4C2
RKEOTHER
5A FUSE
11
SENSOR
SIGNAL
ENGINE
COOLANT
TEMPERATURE
GAUGE LAMP ENGINE
CHECK
FUEL
GAUGE
LAMP PRESSURE
OIL
LOW FUEL
LEVEL
SENSOR
SIGNAL
C2
C2
C1056
DB20 G4
(8W-10-9)
(8W-11-15)
(8W-11-16)
(8W-30-12)(8W-30-7)
(8W-30-11)(8W-30-11)
(8W-15-10)
(8W-15-11)(8W-11-2)
(8W-11-3)
(8W-11-4)
(8W-11-15)
(8W-15-10)
(8W-15-11)
8W - 40 - 6 8W-40 INSTRUMENT CLUSTERPL
J988W-18274

CAV CIRCUIT FUNCTION
1 M2 20YL* DOOR LIFT GROUND SWITCH
2 G34 16RD/GY HIGH BEAM INDICATOR DRIVER
2 L3 16RD/OR** DIMMER SWITCH HIGH BEAM OUTPUT
3 L60 22TN RIGHT TURN SIGNAL
4 G10 20LG/RD SEAT BELT SWITCH SENSE
5 G5 20DB/WT FUSED IGNITION SWITCH OUTPUT (ST-RUN)
6 M1 22PK FUSED B(+)
7 G21 22GY/LB TACHOMETER SIGNAL
8 Z3 16BK/OR GROUND
9 R41 18BK/TN AIRBAG WARNING LAMP DRIVER
10 G7 22WT/OR VEHICLE SPEED SENSOR SIGNAL
BLACK
51
10 6
** RKE
CAV CIRCUIT FUNCTION
1 G6 22GY OIL PRESSURE SWITCH SENSE
2 G19 22LG/OR ABS WARNING LAMP DRIVER
3 G3 22BK/PK CHECK ENGINE LAMP DRIVER
4 G20 22VT/YL ECT GAUGE SENSOR SIGNAL
5 G26 20LB KEY-IN IGNITION SWITCH SENSE
6 G9 22GY/BK RED BRAKE WARNING LAMP DRIVER
7 G12 22TN/BK GENERATOR LAMP DRIVER
8 L61 22LG LEFT TURN SIGNAL
9 E2 22OR PANEL LAMPS DRIVER
10 G4 20DB FUEL LEVEL SENSOR SIGNAL
BLACK
51
10 6
INSTRUMENT
CLUSTER - C1
CLUSTER - C2INSTRUMENT
* LHD
8W - 80 - 24 8W-80 CONNECTOR PIN-OUTSPL
J988W-1PL008024