sensor DODGE TRUCK 1993 Service Workshop Manual

8H - 4 VEHICLE
SPEED
CONTROL SYSTEM

GAS
ENGINE
CONTINUED

UNIT
DISENGAGES
ON ROUGH ROAD
IMPROPER
ADJUSTMENT OF STOP LAMP AND SPEED
CONTROL SWITCH*

FAULTY

ELECTRICAL CIRCUIT
£
ENGINE DOES
NOT RETURN TO NORMAL IDLE

SPEED
CONTROL

THROTTLE
CABLE
KINKED OR DAMAGED
STANDARD
THROTTLE
LINKAGE FAULTS 1
DRIVE VEHICLE OVER
ROUGH ROAD
TAP BRAKE PEDAL
LIGHTLY,
SPEED
CONTROL SHOULD
DISENGAGE

SPEED
CONTROL
DISENGAGES

PUSH RESUME/ACCEL SWITCH VEHICLE
SHOULD RESUME PREVIOUSLY
MEMORIZED SPEED
VEHICLE RESUMES
SPEED

DEPRESS
BRAKE
PEDAL,
SPEED CONTROL
SHOULD DISENGAGE NO SYSTEM
DISENGAGEMENT
WHEN MAKE PEDAL
IS
DEPRESSED
DEFECTIVE OR
IMPROPERLY ADJSUTED
STOP LAMP AND
SPEED
CONTROL SWITCH
y
f

SPEED
CONTROL

THROTTLE
CABLE
KINKED OR DAAAAGED

1

FAULTY
ELECTRICAL CIRCUIT*

f

DEFECTIVE SERVO NO RESUME WHEN

BUTTON
IS
PRESSED
SPEED
CONTROL

DISENGAGES

DEFECTIVE SWITCH

FAULTY
ELECTRICAL CIRCUIT* NO SYSTEM

DISENGAGE

WHEN BRAKE PEDAL IS
DEPRESSED
SPEED
CONTROL
SYSTEM OK
1

f

DEFECTIVE ENGINE CONTROLLER

1

FAULTY
ELECTRICAL CIRCUIT*
r
STICKY BRAKE SWITCH RESUM

ISPO

BELOW
2
E
SPEED

SSIBLE

10
M.P.H.
y t
DEFECTIVE DISTANCE
SENSOR

y f
DEFECTIVE
ENGINE CONTROLLER
J928H-14

- 6
VEHICLE SPEED CONTROL SYSTEM

• £

UNIT
DISENGAGES
ON ROUGH ROAD
IMPROPER
ADJUSTMENT
OF
STOP LAMP AND SPEED
CONTROL SWITCH*

i

FAULTY

ELECTRICAL CIRCUIT
ENGINE DOES
NOT RETURN
TO
NORMAL IDLE

SPEED
CONTROL

THROTTLE
CABLE
KINKED OR DAAAAGED
STANDARD
THROTTLE
LINKAGE FAULTS
NO RESUME WHEN

BUTTON
IS
PRESSED
DRIVE VEHICLE OVER
ROUGH ROAD

±

TAP BRAKE PEDAL
LIGHTLY,
SPEED
CONTROL SHOULD
DISENGAGE

SPEED
CONTROL
DISENGAGES

PUSH RESUME/ACCEL SWITCH VEHICLE
SHOULD RESUME PREVIOUSLY
MEMORIZED SPEED
VEHICLE RESUMES
SPEED

DEPRESS
BRAKE
PEDAL,
SPEED CONTROL
SHOULD DISENGAGE NO SYSTEM
DISENGAGEMENT
WHEN MAKE PEDAL
IS
DEPRESSED
DEFECTIVE OR
IMPROPERLY ADJSUTED STOP LAMP
AND
SPEED
CONTROL SWITCH

1
1

SPEED
CONTROL

THROTTLE
CABLE
KINKED
OR
DAAAAGED

1

FAULTY
ELECTRICAL CIRCUIT*

1

DEFECTIVE SERVO
SPEED
CONTROL

DISENGAGES

DEFECTIVE SWITCH

FAULTY
ELECTRICAL CIRCUIT*
1
NO SYSTEM

DISENGAGE

WHEN BRAKE PEDAL
IS
DEPRESSED
SPEED
CONTROL
SYSTEM
OK
1

r

DEFECTIVE ENGINE CONTROLLER

* r

FAULTY
ELECTRICAL CIRCUIT*

r

STICKY BRAKE SWITCH RESUM

ISPO

BELOW*
E
SPEED

SSIBLE

10
M.P.H.

1

DEFECTIVE DISTANCE
SENSOR

f

DEFECTIVE
ENGINE CONTROLLER
J928H-14 DIESEL ENGINE CONTINUED

•

VEHICLE
SPEED
CONTROL SYSTEM
8H - 7
TEST
PROCEDURES

INDEX

page

Checking
for
Diagnostic
Trouble
Code
7

General
Information
7
Inoperative
System
7

Road
Test
7

Speed
Control
Cable Adjustment—Diesel Engine
. 9

Speed
Control
Cable
Attachment
10

GENERAL
INFORMATION

Before starting diagnosis and repair procedures for
a speed control malfunction, verify that the speed
control wire harness is properly connected to all con­ nectors. Refer to Diagnosis Chart.

ROAD
TEST
Road test vehicle to verify reports of speed control
system malfunction. The road test should include at­
tention to the speedometer. Speedometer operation should be smooth and without flutter at all speeds. Flutter in the speedometer indicates a problem
which might cause surging in the speed control sys­
tem. The cause of any speedometer deficiencies should be corrected before proceeding.

INOPERATIVE SYSTEM
If road test verifies a system problem and the
speedometer operates properly, check for:
• loose electrical and vacuum connections at the
servo.

• check for correct installation of the vacuum check
valve in the hose from servo to vacuum source (Gas
Engine Only). The word VAC on the valve must
point toward the vacuum source. • corrosion that should be removed from electrical
terminals and a light coating of Mopar Multi-Pur­
pose Grease, or equivalent, applied. • secure attachment of both ends of speed control ca­

ble.

CHECKING
FOR DIAGNOSTIC TROUBLE CODE
(1) When trying to verify a speed control system
electrical problem, use a DRB II Scan Tool to find
the cause. Refer to Powertrain Diagnostic Procedures manual. If the DRBII is not available, the Diagnostic Trou­
ble Code (DTC) may be determined with the follow­ ing method: (a) With key inserted in ignition switch, cycle
switch to ON position 3 times. On third cycle, leave
switch in ON position. (b) After switch has been cycled 3 times, observe
Malfunction Indicator Lamp (CHECK ENGINE) on instrument cluster. If a DTC is present, the code
page

Speed
Control
Cable Attachment—Servo
10

Stop Lamp Switch Test
9

Vacuum Supply Test
....................... 9

Vehicle Speed
Control
Switch Test
. 9

Vehicle Speed
Control
System
Electrical
Tests
... 7

Vehicle Speed Sensor Test
7
will be displayed in a series of flashes representing
digits.
Three flashes in rapid succession, a slight
pause, then 4 flashes in rapid succession would in­ dicate DTC 34.
(2) If a DTC 34 is observed, perform the tests in
the sections Electrical Tests at Servo and Electrical
Tests at Powertrain Control Module.
If a DTC 15 is observed, perform the test for a
faulty Vehicle Speed Sensor.
(3) If a fault code 11 is observed (Diesel only), per­
form the test for a faulty engine speed sensor. Refer
to the Powertrain Diagnostics Procedures Manual.
(4) Correct any problems found when performing
these tests and recheck for DTC if changes were made.

VEHICLE SPEED SENSOR TEST
For testing of the Vehicle Speed Sensor and related
components refer to the Powertrain Diagnostic Proce­
dures manual.

VEHICLE SPEED CONTROL SYSTEM ELECTRICAL
TESTS
Vehicle speed control systems may be tested using
two different methods. One involves the use of the DRBII Scan Tool. If this test method is desired,
please refer to the Powertrain Diagnostic Procedures manual. The other test method uses a voltmeter. The volt­
meter method is described in the following tests.
If any information is needed concerning wiring, re­
fer to Group 8W - Wiring Diagrams.

CAUTION:
When test probing
for
voltage
or
conti­nuity
at
electrical
connectors, care must
be
taken
not
to
damage connector, terminals,
or
seals.
If

these components
are
damaged,
intermittent
or
complete system
failure
may
occur.
ELECTRICAL
TESTS
AT
SERVO
(1) Turn ignition switch to ON position.
(2) Push speed control switch to ON position.
(3) Connect the negative lead of a voltmeter to a
good chassis ground near the servo.

8L
- 8
LAMPS

CONNECTOR

CUP
FRONT

LAMP
ASSEMBLY
LICENSE
PLATE

SCREW
LAMP
ASSEMBLY

LICENSE
PLATE

RR8LD24

Fig.
15
License
Plate
Lamps
-
Step
Bumper
TO
TAIL,
STOP,

TURN
SIG. AND
BACK
UP
LAMPS

LICENSE
PLATE
LICENSE
PLATE
LAMP
AND

LAMP
CONNECTOR
BRACKET
ASSEMBLY
J908L-74

Fig.
16
License
Plate
Lamp
Without Rear
Bumper

UNDERHOOD
LAMP
When equipped, the underhood lamp is installed on
the hood left, rear inner panel (Fig, 17). The lamp is
illuminated when the hood is opened (Fig. 18). UNDERHOOD LAMP BULB REPLACEMENT

REMOVAL
(1) Disconnect the wire connector from the under­
hood lamp (Fig. 17).
(2) Rotate the bulb counter-clockwise. Remove it
from the lamp base socket (Fig. 18).

INSTALLATION
(1) Insert the replacement bulb in the lamp base
socket. Rotate it clockwise.
(2) Connect the wire connector to the lamp (Fig.

17).

UNDERHOOD LAMP REPLACEMENT

REMOVAL
(1) Disconnect the wire connector from the lamp
(Fig. 17). (2) Rotate the bulb counter-clockwise. Remove it
from the lamp base socket (Fig. 18). (3) Remove the screw that attaches the lamp re­
flector and support bracket to the hood inner panel (Fig. 17).
(4) Remove the lamp from the hood inner panel.
INSTALLATION (1) Position the underhood lamp on the hood inner
panel. (2) Install the screw through the lamp and into the
hood panel (Fig. 17). Tighten the screw securely. (3) Insert a replacement bulb in the lamp base
socket (Fig. 18). Rotate it clockwise. (4) Connect the wire connector to the lamp (Fig.

17).
HOOD

J9223-446

Fig.
17
Underhood
Lamp
DAYTIME
RUNNING
LIGHT
MODULE
(CANADA

ONLY)
The headlamps on vehicles sold in Canada will il­
luminate when the ignition is ON. The module also
receives a signal from the distance sensor. This pro-
SUPPORT

BRACKET RETAINER
LIQUID

TAB SWITCH
ENCLOSURE

WIRE
HARNESS
CONNECTOR

\
1

d1^—1—l
L/

CMD>

LAMP

REFLECTOR
BULB
(105)
BASE
J9281"1
Fig.
18
Underhood
Lamp
Components

8W
- 2
WIRING
DIAGRAMS

•
WIRE CODE
IDENTIFICATION

Each wire shown in the diagrams contains a code
(Fig. 3) which identifies the main circuit, part of the
main circuit, gauge of wire, and color. The color is shown as a two letter code which can be identified by
referring to the Wire Color Code Chart (Fig. 4). If
the wire has a tracer and it is a standard color an asterisk will follow the main wire color. If the tracer
is non-standard the main wire color will have a slash (/) after it followed by the tracer color. 18
LB/YL*
COLOR
OF
WIRE

(Light
Blue
with
Yellow
Tracer)
.
GAUGE
OF
WIRE
(18
Gauge)

PART
OF
AAAIN CIRCUIT

(Varies
Depending
on
Equipment)

AAAIN CIRCUIT
IDENTIFICATION
918W-16

Fig.
3
Wire
Color
Code
Identification

CIRCUIT IDENTIFICATION
All circuits in the diagrams use an alpha/numeric
code to identify the, wire and its function. To identify
which circuit code applies to a system, refer to the
Circuit Identification Code Chart. This chart shows
the main circuits only and does not show the second­ ary codes that may apply to some models.
COLOR

CODE COLOR
STANDARD
TRACER

COLOR COLOR

CODE
COLOR
STANDARD

TRACER
CODE
BL BLUE WT
OR ORANGE

BK
BK
BLACK
WT PK
PINK
BK
OR WT

BR
BROWN
WT RD
RED WT
DB DARK
BLUE WT
TN
TAN WT
DG DARK
GREEN WT
VT

VIOLET
WT
GY GRAY
BK

WT

WHITE
BK

LB
LIGHT

BLUE
BK

YL YELLOW

BK

LG
LIGHT

GREEN
BK

*

WITH
TRACER

918W-136
Fig.
4
Wire
Color
Code
Chart

LOCATING
A
SYSTEM
OR
COMPONENT
To locate a system or component in the diagrams,
refer to the alphabetical index at the front of the di­ agrams. Determine the diagram sheet number. Sheet
numbers are located at the lower right or left hand
corner of each sheet. Page numbers at the top of
the page do not apply to diagram sheets. The diagram index identifies the main system and
all components that relate to that system. There are
also sections of the index that identify specific com­
ponents only (for example modules, lamps, etc.). Re-

MAIN
CIRCUIT IDENTIFICATION

CIRCUIT
DESCRIPTION
CIRCUIT
DESCRIPTION

A
Battery
Feed: Fused and Unfused
P
Power
Assist
System:
Locks,
Mirrors

B
ABS
System Q Power
Assist
System: Windows

C
Air Conditioning System

R
Airbag System

D
CCD
(+),
CCD
(-)
S
Air Suspension, Automatic Load Leveling

E
Interior
Lamp
Illumination
T Electronic Automatic Transaxle
F
Battery
Feed: Fused and Unfused
V
Windshield Wipers and Washers,

G
Sensors,
Sending Units, Switches Vehicle Speed Control System

K
Powertrain
Central
Module W Power
Assist
System: Windows

L
Exterior
Lighting, Stop Lamp Switch
X
Horn, Radio, Radio Speakers, Power Locks
M
Interior
Lamps
Z
Ground Circuits: Includes power and signal

Interior
Lamps

grounds
for PCM

938W-17

8W
-6
WIRING DIAGRAMS
•
LEGEND
OF SYMBOLS
USED
ON
WIRING DIAGRAMS

+
POSITIVE
CONNECTOR
—
NEGATIVE
—>
MALE
CONNECTOR

_L_
GROUND
>
FEMALE CONNECTOR

FUSE
S DENOTES WIRE CONTINUES ELSEWHERE

GANG
FUSES
WITH
BUSS
BAR
DENOTES WIRE GOES
TO
ONE
OF TWO

CIRCUITS
CIRCUIT
BREAKER
SPLICE

CAPACITOR
<3>2
i
SPLICE
IDENTIFICATION

A
OHMS

cftP—
THERMAL ELEMENT

RESISTOR
| TIMER
|
TIMER

VARIABLE
RESISTOR
1
^ ^ ^ |
'YY Y1
MULTIPLE CONNECTOR

SERIES
RESISTOR
o-l
WIRING
WITH

OPTIONAL WIRING
WITHOUT

COIL Y "Y" WINDINGS
—o
STEP
UP COIL

BB-BB
DIGITAL READOUT
OPEN CONTACT
-0-

SINGLE
FILAMENT LAMP
M
K #
CLOSED
CONTACT
-(5-DUAL FILAMENT LAMP

CLOSED
SWITCH
LE.D.
-
LIGHT
EMITTING
DIODE
OPEN SWITCH —^— THERMISTOR

CLOSED
GANGED SWITCH
GAUGE

mi OPEN GANGED SWITCH

SENSOR

TWO POLE SINGLE THROW SWITCH FUEL INJECTOR

PRESSURE
SWITCH
E
|
#36

DENOTES WIRE
GOES
THROUGH
BULKHEAD DISCONNECT

3i
SOLENOID SWITCH
#" STRG
COLUMN DENOTES WIRE GOES THROUGH

STEERING
COLUMN CONNECTOR

frt
MERCURY
SWITCH
| PANEL
J
DENOTES WIRE GOES THROUGH
INSTRUMENT PANEL CONNECTOR
H«- DIODE
OR
RECTIFIER
j
ENG |
DENOTES WIRE GOES THROUGH GROMMET
TO ENGINE COMPARTMENT
BY-DIRECTIONAL ZENER DIODE DENOTES WIRE GOES THROUGH GROMMET

-o-
MOTOR
HEATED GRID ELEMENTS
0 ARMATURE AND BRUSHES

908W-191

Fig.
11
Symbol
identification

CRANKSHAFT
POSITION
SENSOR

TO CRANKSHAFT POSITION
(SEE
VIEW
X)

VEHICLE
SPEED
SENSOR
CONVERTER
CLUTCH
SOLENOID
TO
VEHICLE SPEED SENSOR BEYOND THIS POINT
SEE MAIN VIEW
TO HEATED OXYGEN SENSOR
(SEE VIEW X)

VIEW
A

4X4 TRANSFER
CASE
(TYPICAL)
VEHICLE

SPEED
SENSOR
1 >
a
so
>

w
J938W-102

Fig. 21 Transmission Wiring (Gas Engines) 2

FUEL
INJECTOR
#6
FUEL
INJECTOR
#4
FUEL
INJECTOR
#2
BEYOND
THIS
POINT

SEE
VIEW
Z

EGR
SOLENOID/
TRANSDUCER
ASSEMBLY
A/C
COMPRESSOR

CLUTCH

GENERATOR
GROUND
POWER
STEERING
PUMP

AAAP

SENSOR
THROTTLE
EVAP/

POSITION
PURGE
(SENSOR)
SOLENOID IDLE
AIR

CONTROL MOTOR
TO
A/C

COMPRESSOR
CLUTCH
DISTRIBUTOR

IGNITION
COIL
ENGINE

COOLANT

TEMPERATURE

ENGINE
COOLANT
SENSOR
(PCM)
TEMPERATURE

SENSOR
(GAUGE)
ENGINE
OIL

PRESSURE

SENDING
UNIT/
SWITCH
DISTRIBUTOR

CONNER ,NJECTOR#1
INJECTOR
#3
VIEW
IN
DIRECTION OF ARROW
1
FUEL
INJECTOR
#5
TO

'TRANSMISSION
WIRING

J938W-85 INS
m
a

o

>

o

>
2

m Fig. 23 Engine
Wiring
3.9L MPI Engine

FUEL
INJECTOR
#8
FUEL
INJECTOR #4 FUEL
INJECTOR
#2

EGR

SOLENOID/

TRANSDUCER

DISTRIBUTOR
IGNITION
COIL
THROTTLE

BODY

CHARGE
AIR

TEMPERATURE
SENSOR

BEYOND
THIS
POINT
SEE
VIEW,
Z

TO
A/C

COMPRESSOR
CLUTCH ^DISTRIBUTOR

GENERATOR
GROUND

POWER

STEERING
PUMP ENGINE
OIL

PRESSURE
SENDING
UNIT/SWITCH

VIEW
IN
DIRECTION OF ARROW
Y

TO TRANSMISSION WIRING

THROTTLE
POSITION
(SENSOR)
IDLE AIR
CONTROL MOTOR

GENERATOR
ENGINE COOLANT

TEMPERATURE
SENSOR
(PCM)
ENGINE
COOLANT

TEMPERATURE

SENSOR
(GAUGE)
MAP

SENSOR

FUEL
INJECTOR
#3

EVAP/PURGE

SOLENOID

FUEL
INJECTOR #7
FUEL
INJECTOR.
#5

FUEL
INJECTOR
#1

A/C
CLUTCH VIEW
IN
DIRECTION
OF ARROW
Z

J938W-86
Fig.
24 Engine Wiring 5.2L and 5.9L MPI Engine o
>
30

>

2
w

oo !\3

WIRING
DIAGRAMS
8W
- 37

WIRING DIAGRAMS AD-BODY

INDEX

Wiring Diagram Name Sheet Number

A/C
Heater System
with
Diesel Engine ............ .69,70 Blower Motor
. .69

Compressor
.70

Cycling Switch
.70
Diodes
70

Fuse
69
Low Pressure Switch
70

Resistor
. 69

Switch-Blower
. 69

Vacuum
Control
Switch
.69
Wide Open
Throttle
Cut-Out Relay
70

A/C
Heater System
with Gas
Engine .67,68 Blower Motor
.67

Compressor
.68

Cycling Switch
68
Low Pressure Switch
.68

Diodes
. .68
Fuse
. .67
Resistor
67

Switch-Blower
67

Vacuum
Control
Switch
.67
Wide Open
Throttle
Cutout Relay
68

Air Heater Relay Diesel Engine
.21
Air
Intake
Heater Diesel Engine
22

Anti-Lock Rear Brake System
with
Diesel Engine
.....
.33,34 Brake Warning Lamp Switch
34

Data Link Connector
33

Duel Solenoid Hydraulic Valve
34

Electronic Vacuum
Sensor
.34
Fuse
33

Module
.33
Park
Brake Switch
.33
Resistor
34

Rolls
Test Connector
33

Sensor
34

Stop
Lamp
34

Anti-Lock Rear Brake System
with Gas
Engine .31,32 Brake Warning Lamp Switch
.32

Data Link Connector
. .31

Dual Solenoid Hydraulic Valve
32

Fuse
31
Module
31
Park
Brake Switch
.31
Resistor
32

Rolls
Test Connector
31

Sensor
32

Stop
Lamp Switch
32

Back-Up
Lamp Switch
with
Diesel Engine
.7
Back-Up
Lamp Switch
with Gas
Engine
.9

Battery
.1,3,5
Brake Warning
Indicator
Lamp (Diesel Engine)
.57

Brake Warning
Indicator
Lamp
(Gas
Engine)
58

Brake Warning
Indicator
Lamp Switch (Diesel Engine)
. . . .34
Wiring Diagram Name Sheet Number
Brake Warning
Indicator
Lamp Switch
(Gas
Engine)
32
Bulkhead Disconnect 50-Way .85,86
Buzzer-Combined Headlamp,
Key In, and
Seat
Belt
. . .
.27,28

Bypass
Jumper
(Clutch
Pedal Position)
8

Cargo
Lamp .49,50
Cargo
Lamp Switch
49

Charging System
with
Diesel Engine ..............
.5,6
Battery
5

Generator
. .6

Charging System
with
Gas Engine
.3,4
Battery
3

Generator
, . .4

Cigar
Lighter,
Ash &
Glove
Box
Lamps
52

Circuit
Breakers Power Windows
2,71

Clearance Lamps Duel Rear Wheels
.
.41,43 Clearance Lamps Roof Mounted
40

Clockspring 30,36,38
Clutch Pedal Position Switch
.8

Cold
Start
Advance Motor
24

Compressor,
A/C
68,70 Data Link Connector 17,23,31,33
Data Link Connectors
Rear
Wheel Anti-Lock Diesel Engine
.33

Rear
Wheel Anti-Lock Gas Engine
31

Daytime Running
Light
Module
46

Diesel
Control
System .21,22,23,24,25,26
Air Heater Relay
. .21

Air
Intake
Heater
21
Automatic
Shut Down Relay
22

Cold
Start
24

Crankshaft Position
Sensor
. .25
Data Link Connector
. .23

Engine
Coolant Temp Switch
.26

Fuel Heater
24

Fuel Solenoid
24
Intake
Air
Temp
Sensor
25

Powertrain
Control
Module 21,22,23,25,26

Resistor
.24

Thermo Switch
24

Throttle
Position (Sensor)
26

Transmission Thermo Switch
. . .26

Vehicle Speed
Sensor
25,26 Water
in
Fuel
Sensor
.25

Dimmer Switch-Headlamp
. .47

Diode 68,70
Diode
and
Mold Assembly
51

Dome
and
Cargo Lamp
50

Door
Jamb Switches
49
Left
Switch
.49
Right Switch
49

Dual Solenoid Hydraulic Valve
.32
EMCC
System (3-Speed)
. .11