turn signal bulb DODGE TRUCK 1993 Service User Guide

14 - 82
FUEL 'SYSTEM
—. — ~—— — «

INTAKE HEATER CYCLE CHART

Intake
featperafwre
Preheat
Cycle
Time

Ignition
l£ey ON

Engine
Not
Running
Pestheat
Cycle

Ignition
Key ON
Snglne Running

Above
15
°C
(59
°F)
0 Seconds
No

-8°C(18°F)to
15°C (59
°F)
10
Seconds

Yes

-17°C(1
°F)
-9
°C(]6°F)
15
Seconds
Yes

«2d°C(-15°F)
to-18°C(0
°F) 17.5
Seconds
Yes

Below-26
°C (-15
*F)
20 Seconds

Yes

J9114-239
AUTO SHUT DOWN (ASD) RELAY-PCM OUTPUT
The ASD relay is located in the engine compart­
ment (Fig. 14).
TORQUE CONVERTER
CLUTCH RELAY A/C CLUTCH RELAY STARTER RELAY
AUTO SHUTDOWN RELAY FUEL PUMP RELAY DATA LINK
CONNECTOR
POWERTRAIN

CONTROL MODULE
J9314-164

Fig.
14 Relay Location—Typical The ASD relay supplies battery voltage to the gen­
erator field winding to provide regulation of the
charging system. The ground circuit for the ASD re­
lay is controlled by the PCM. The PCM operates the
relay by switching the ground circuit on and off.

MALFUNCTION INDICATOR LAMP-PCM OUTPUT
The malfunction indicator lamp (formerly referred
to as the check engine lamp) illuminates at the bot­
tom of the instrument panel each time the ignition
key is turned on. It will stay on for three seconds as
a bulb test. If the powertrain control module (PCM) receives an
incorrect signal, or no signal from certain sensors or emission related systems, the lamp is turned on. This
is a warning that the PCM has recorded a system or
sensor malfunction. In some cases, when a problem is
declared, the PCM will go into a limp-in mode. This is an attempt to keep the system operating. It signals
an immediate need for service.
The lamp can also be used to display a diagnostic
trouble code (DTC). Cycle the ignition switch
On-Off-
On-Off-On within three seconds and any codes stored
in the PCM memory will be displayed. This is done
in a series of flashes representing digits. Refer to On-
Board Diagnostics in the General Diagnosis section
of this group for more information.

OVERDRIVE
INDICATOR LAMP-PCM OUTPUT
Indicates the state of the overdrive defeat switch
on the instrument panel.

OVERDRIVE
S0LEN0ID-PCM OUTPUT
The overdrive solenoid is used on vehicles that
have an automatic transmission. The solenoid is op­ erated by the PCM. It controls shifting in and out of
overdrive through the overdrive solenoid. Refer to Group 21 for overdrive solenoid service.

SCI
TRANSMIT—PCM OUTPUT
SCI Transmit is the serial data communication
transmit circuit for the DRB II scan tool. The PCM
transmits data to the DRB II through the SCI Trans­
mit circuit.

SPEED
C0NTR0L-PCM OUTPUT
The speed control vacuum and vent solenoids are
operated by the PCM. The vacuum solenoid main­
tains vacuum at a required pressure to resume, set or accelerate the speed control system. The vent so­
lenoid allows vacuum to bleed off during decelera­
tion, when the brakes are applied, or the
transmission is shifted into park or neutral.

TACHOMETER-PCM
OUTPUT
This output generates the necessary signal needed
to operate a dealer installed tachometer (if equipped).
The input for this signal is from the engine speed sensor.

WAIT-TO-START LAMP-PCM OUTPUT
The wait-to-start lamp is turned on and off by the
PCM based on the charge air temperature sensor in­
put. The light is turned on when the ignition is first ac­
tivated. It will remain on for two seconds as a bulb
test. If the PCM reads intake manifold air tempera­
ture below 15°C (59°F), it will turn the wait-to-start light on for the intake heater preheat cycle. The
light stays on until the preheat cycle is over. The wait-to-start light will flash on and off if the
charge air temperature sensor input to the PCM is

14-86
FUEL
SYSTEM

WARNING:
USE
EXTREME CAUTION WHEN
IN­

SPECTING
FOR
HIGH
PRESSURE
FUEL
LEAKS.
IN­

SPECT
FOR
HIGH
PRESSURE
FUEL
LEAKS
WITH
A

SHEET
OF
CARDBOARD. HIGH FUEL INJECTION
PRESSURE
CAN
CAUSE PERSONAL INJURY
IF

CONTACT
IS
MADE
WITH
THE
SKIN.

MECHANICAL
LIFT
PUMP
The mechanical lift pump
is
located
on the
left side
of

the engine cylinder block.
The
lift pump
is
driven
by an
eccentric
on the
camshaft that actuates
a
spring loaded lever
in the
pump
(Fig. 25). The
lever
is
connected
to

the pump diaphragm. When
the
eccentric
on the
cam­ shaft pushes
the
lever upward,
the
lever
in
turn pulls
the diaphragm
to its
extended position. With
the
lever in
the
extended position, fuel
is
drawn into
the
pump
chamber through
the
inlet check valve. When
the
pump
gathers more fuel
in the
fuel chamber than
the
engine
can consume,
the
outlet check valve
is
held closed. Fuel
gathered
in
lift pump chamber prevents
the
diaphragm
from relaxing.
The
lever will continue
to
move
up and

down
on the
shaft connecting
it to the
diaphragm. How­ ever,
it is
prevented from operating
the
diaphragm until
the check valve again opens
and the
fuel
in the
pump chamber
is
expelled. This process continues
as
long
as

the engine
is
running. Minimum lift pump output pressure
is 21 Kpa (3

psi).
Lift pump output volume
is 0.75
liters
(0.70 U.S.
quarts)
per 30
seconds
of
engine cranking.

Fig.
25 Lift
Pump

The lift pump housing
has a
weep hole
at the
bot­
tom
of the
casing
(Fig. 25). If the
diaphragm rup­

tures,
fuel will exit
out of the
weep hole
and the

pump must
be
replaced.
The
lift pump
is not
service­ able
and
must
be
replaced
as a
complete assembly.
CAUTION:
Do not
operate
the
engine
if the
fuel
sup­

ply
line
has a
restriction
of
more than
95 MM Hg

(3.75
in Hg).
The lift pump
has a
manual lever
(Fig. 26). The le­

ver
is
located
on the
lower right side
of the
pump
housing.
The
purpose
of the
lever
is to
prime
the
fuel system
and
bleed
air
from
the
system
if the
vehicle
has
run out of
fuel. Raise
and
lower
the
lever until
resistance
is
felt
to
prime
the
system
up to the
injec­
tor pump. During vehicle operation
the
pump
le­

ver must
be in the up
position.
FUEL
PUMP
MANUAL
JKT /
LEVER
——-—•
.
LJ*y^"^^

J9114-3

Fig.
26 Lift
Pump
Manual
Lever

SYSTEM
OPERATION
IGNITION
SWITCH
ON
When
the
ignition switch
is put in the ON (run)

position,
the
following occurs: •
The PCM
receives
an
ignition sense input.
It
then
powers
up.
Battery voltage
is
supplied through
the

battery voltage input. •
The
wait-to-start lamp
and the
water-in-fuel lamp are turned
on by the PCM for 2.8
seconds
as a
bulb test.
•
The PCM
monitors
the
charge
air
temperature
sensor input.
If
manifold
air
temperature
is at or be­

low
15°C
(59°F),
the PCM
will start
the air
intake
heater preheat cycle.
It
will energize
the
intake heat­
ers
by
grounding
the air
intake heater relays.
The

PCM will turn
the
wait-to-start light
on
until
the

preheat cycle
is
over.
If PCM
receives
a
crank signal
from engine speed sensor before preheat cycle
is
over, it will abort preheat cycle.
•
The PCM
monitors engine speed. When
the
engine speed
is
above
384 rpm, the PCM
determines that
the engine
is
running.
•
The PCM
will turn
on the
water-in-fuel lamp
if a
signal
is
received from
the
water-in-fuel sensor.

ENGINE
START-UP
When
the
ignition
key is put in the
start position,
the following occurs: •
The PCM
receives
a
crank signal input from
the

engine speed sensor.
•
The air
intake heaters
are not
energized during cranking.

CLUSTER
AND
GAUGE SERVICE PROCEDURES
. . . 8E-12

CLUSTER
AND
GAUGE TEST PROCEDURES
8E-5

GENERAL INFORMATION
8E-1

MESSAGE
CENTER-DIESEL ENGINE
8E-4

MESSAGE
CENTER-GAS ENGINE
8E-3

SWITCH
AND
PANEL COMPONENT SERVICE
8E-16

INTRODUCTION
lntro.-1
DESIGNATIONS, LABELS/PLATES/DECALS, CODES AND DIMENSIONS/WEIGHTS
Intro.-1

MEASUREMENT
AND
TORQUE SPECIFICATIONS
lntro.-11

LAMPS
8L-1
BULB APPLICATION
8L-11

EXTERIOR LAMPS
8L-1

EXTERIOR LAMPS SERVICE PROCEDURES
8L-3
INTERIOR LAMPS
8L-10

LUBRICATION
AND
MAINTENANCE
0-1
CHASSIS
AND
BODY
0-28
DRIVETRAIN
0-22

ENGINE MAINTENANCE
0-14

GENERAL INFORMATION
0-1

POWER DOOR LOCKS
8P-1
SERVICE
PROCEDURES
8P-2

TEST PROCEDURES
8P-1

POWER MIRRORS
8T-1
SERVICE
PROCEDURES
8T-2

TEST PROCEDURES
8T-1

POWER WINDOWS
8S-1
SERVICE
PROCEDURES
8S-3

TEST PROCEDURES
8S-1

PROPELLER SHAFTS
16-1
GENERAL INFORMATION
16-1
PROPELLER SHAFT REPLACEMENT
16-8

SERVICE
DIAGNOSIS/PROCEDURES
16-3

TORQUE SPECIFICATIONS
16-15
UNIVERSAL
JOINT
REPLACEMENT
16-10

REAR
SUSPENSION
AND
AXLE
3-1
8
3/8 and 9 1/4
AXLE
3-11

GENERAL INFORMATION
3-1

MODEL
60 and 70
AXLES
3-29

POWER-LOK DIFFERENTIAL
3-55

REAR
SUSPENSION—2WD
and 4WD
VEHICLES
.... 3-3

SERVICE
DIAGNOSIS
3-6

SPECIFICATIONS
3-27

SURE-GRIP
DIFFERENTIAL SERVICE
3-28

TORQUE SPECIFICATIONS
3-59

TRAC-LOK DIFFERENTIAL
3-51

REAR
WINDOW DEFOGGER
8N-1
REPAIR PROCEDURES (GRID LINES, TERMINALS,
AND PIGTAILS)
8N-3

SERVICE
PROCEDURES
8N-4

TEST PROCEDURES
8N-1

STEERING
19-1
GENERAL INFORMATION
19-1
POWER STEERING PUMP
19-11
POWER STEERING SYSTEM DIAGNOSIS
19-2

RECIRCULATING BALL POWER STEERING GEAR
. . 19-20

STEERING COLUMN
19-35

STEERING LINKAGE
19-17

TORQUE SPECIFICATIONS
19-40

TRANSMISSION
AND
TRANSFER CASE
21-1

AUTOMATIC TRANSMISSION DIAGNOSIS
AND

TESTING
21-85

AUTOMATIC TRANSMISSION REMOVAL
AND
INSTALLATION
21-142

AUTOMATIC TRANSMISSION—32RH/36RH/37RH/
42RH/46RH
21-73

G360
MANUAL TRANSMISSION
21-46

G360
TRANSMISSION OVERHAUL
21-53

GENERAL INFORMATION-32RH/36RH/37RH
21-73

GENERAL INFORMATION—42RH/46RH
. . . 21-78

IN-VEHICLE SERVICE—32RH/36RH/37RH/ 42RH/46RH
21-130

NP205
TRANSFER CASE
21-342

NP241
TRANSFER CASE
21-350
NV4500
MANUAL TRANSMISSION
21-1

NV4500
TRANSMISSION OVERHAUL
21-6

OVERDRIVE
UNIT
OVERHAUL—42RH/46RH
21-324

TRANSMISSION OVERHAUL—32RH
21-152

TRANSMISSION OVERHAUL—36RH/37RH
21-192
TRANSMISSION OVERHAUL—42RH
21-233

TRANSMISSION OVERHAUL—46RH
21-278

TRANSMISSION/TRANSFER CASE SPECIFICATIONS
21-364

TURN SIGNALS
AND
HAZARD WARNING FLASHER
. . . 8J-1
GENERAL INFORMATION
8J-1
MULTIFUNCTION SWITCH SERVICE PROCEDURES.
. 8J-3

MULTIFUNCTION SWITCH TESTING PROCEDURES.
. 8J-2

VEHICLE
SPEED
CONTROL SYSTEM
8H-1
SERVICE
PROCEDURES
8H-11

TEST PROCEDURES
8H-7

WHEELS
AND
TIRES
22-1
TIRES
22-1

TORQUE SPECIFICATIONS
22-13
VEHICLE VIBRATION
22-11
WHEELS
22-6

WINDSHIELD WIPER
AND
WASHER
SYSTEMS
8K-1
INTERMITTENT WINDSHIELD WIPER FUNCTION
AND
SWITCH TESTING PROCEDURES
8K-6

TWO
SPEED
WINDSHIELD WIPER MOTOR
AND
SWITCH TESTING PROCEDURES
8K-1

WINDSHIELD WASHERS
8K-10

WINDSHIELD WIPER SYSTEM SERVICE
PROCEDURES
8K-7

WIRING DIAGRAMS
8W-1
COMPONENT IDENTIFICATION
8W-9

GENERAL INFORMATION
8W-1

SPLICE
LOCATIONS
8W-29

WIRING DIAGRAMS AD-BODY
8W-37