bulb DODGE TRUCK 1993 Service Owner's Manual

•

LAMPS
8L - 11
BULB
APPLICATION

GENERAL
INFORMATION
The following Bulb Application Table lists
the

lamp title
on the
left side
of the
column
and
part
number
on the
right.

CAUTION:
Do not use
bulbs
that
have
a
higher
can­

dle power than
the
bulb
listed
in the
Bulb
Applica­

tion Table.
Damage
to
lamp
can
result.

EXTERIOR LAMPS
Auxiliary Turn Signal (Snow Plow) 2057
Auxiliary Headlamps (Snow Plow) .6054
Back-up....................... .......1156 Cargo Lamp..
922

Clearance Lamps
194

Front Side Marker
168

Headlamp/Sealed Beam .6052
License Plate
168
Park/Turn Signal 2057
TaiyStop/Turn Signal ...2057

INTERIOR LAMPS

DIMMER CONTROLLED LAMPS Service procedures
for
most
of the
lamps
in the in­

strument panel
are
located
in
Group
8E,
Instrument
Panel
and
Gauges. Some components have lamps
that
can
only
be
serviced
by an
Authorized Service Center (ASC). These components must
be
removed
from
the
vehicle
for
service. Contact local dealer
for
location
of
nearest
ASC.
A/C Heater Control
158

Ash Receiver
..158

Gear Shift Selector...........................................PC194
Heater Control
158

Instrument Cluster.. PC 194
Radio
ASC
Snow Plow Control
.158

INDICATOR LAMPS Service procedures
for
most
of the
lamps
in the in­

strument panel,
and
switches
are
located
in
Group

8E,
Instrument Panel
and
Gauges. Anti-lock Brake PC194
Brake Warning PC194 Check Engine PC194
Engine
Oil
Pressure
158

Fasten Seat Belts.. PC 194 Four Wheel Drive ....158
Hazard Flasher
194

High Beam PC194
Low Fuel....... JPC194
Maintenance Required PC 194
Transmission Temperature ..PC 194 Turn Signal PC194
NON-DIMMING LAMPS Service procedures
for
most
of the
lamps
in the
fol­
lowing list
can be
found
in
Group
23,
Body.
Dome
1004

Engine Compartment ...105 Glove Compartment....
1891

Ignition Lock
ASC

Reading Lamp
912

8N
- 2
REAR WINDOW DEFOGGER

• (b) Rear window grid lines (all grid lines would
have to be broken) or one of the feed wires are not
connected for the system to be inoperative.
The following paragraphs outline component check­
out procedures.
If turning the switch ON produces severe voltmeter
deflection, the circuit should be closely checked for a shorting condition. If system operation has been verified but indicator
bulb does not light, check and replace bulb.
For detailed wiring information, refer to Group 8W
- Wiring Diagrams.

REAR
WINDOW GRID LINES TEST
Horizontal grid lines and vertical bus bar lines
printed and baked on inside surface of rear window glass (Fig. 1) comprise an electrical parallel circuit.
The electrically conductive lines are made of a silver- ceramic material. When baked onto glass they be­
come bonded to the glass and are highly resistant to abrasion. It is possible, however, that a break may
exist or occur in an individual grid line resulting in
no current flow through the line. To detect breaks in
grid lines, the following procedure is required: (1) Turn ignition on and push control switch to
ON. Indicator light should come on. (2) Contact negative lead of a DC voltmeter, to
vertical bus bar connecting grid lines on passenger side of vehicle (point A of Fig. 1). Contact positive
lead of voltmeter, to vertical bus bar on driver side of
vehicle (point B of Fig. 1). Voltmeter should read 10-14 volts. (3) With negative lead of voltmeter, contact a good
body ground point. Voltage reading should not change. A different reading indicates a poor ground connection. (4) Connect negative lead of voltmeter to Point A
on passenger side bus bar and touch each grid line at
Mid-Point with positive lead. A reading of approxi­ mately 6 volts indicates a line is good. A reading of 0
volts indicates a break in line between Mid-Point C and Point B. A reading of 10-14 volts indicates a
break between Mid-Point C and ground Point A. Move toward break and voltage will change as soon as break is crossed.

CONTROL SWITCH/TIMER MODULE TEST
Control switch/timer relay module may be tested
in-vehicle or bench tested. In vehicle testing is ac­
complished in the following manner: (1) Remove switch from instrument panel (refer to
Control Switch Replacement) and leave switch con­
nector plugged in. (2) Turn ignition ON.
(3) Using a DC voltmeter, check voltage at termi­ nals B, I and L (Figs. 2 and 3). Terminals B and I
should confirm a voltage of 10 to 14 volts to ground.
Terminal L should confirm 0 volts to ground. When terminals B and I show no voltage, trace circuit up­
stream of switch/relay module for cause:
• wiring cut
• fusible link faulty
• circuit breaker inoperative
• bulkhead connection bad, etc. If terminal L indicates voltage, place switch in
OFF position. If voltage at L is still indicated or in­
dicator lamp remains on, switch/relay module should
be replaced.
"XI
FUSE
#14
rr~
P 3
AAAP
P
FUSE
#3
20
AAAP
BATTERY

HEATED
REAR

WINDOW
DEFOGGER
SWITCH

(INSTRUMENT
PANEL)

ON/OFF
ILLUMINATION
LAMP

fez TIMER
L.E.I
INDICATOR
LIGHT
-©-
18
GAUGE

FUSIBLE
LINK

IGNITION POWER
MIDPOINT
"C"

CONNECTOR (TYPICAL)
POINT
"A"
POINT
"B"
GROUND
CONNECTOR

REAR
WINDOW
GRID
LINE
STRUCTURE
Fig.
2
Systems
Electrical Circuit
J928N-5

(4) If the relay checks out to this point, momen­
tarily operate switch to ON position. The indicator lamp should come on and remain on for approxi­
mately 10 minutes. Terminal L should confirm volt­
age.
If the indicator lamp fails to light or voltage at
terminal L is not confirmed the switch/relay module should be replaced.
Bench checking of the relay may be accomplished
in the following manner. By following the in-vehicle
procedure except Step 2: With a DC power supply, apply 12 volts to terminal B and I and ground termi­
nal G.

8T - 2
POWER MIRRORS

•
MIRROR
SWITCH TEST PROCEDURE

(1) Remove power mirror switch from mounting
position (refer to Service Procedures). (2) Disconnect wiring harness at switch connector.
(3) Test for continuity (no resistance) between the
terminals of the switch as shown in the MIRROR SWITCH CONTINUITY CHART. (4) If results shown in the chart are not obtained,
replace the switch.
MIRROR
SWITCH
CONTINUITY
CHART

MIRROR SELECTOR KNOB
IN
"L"
POSITION Move
Lever Continuity Between

WT
and BK

YL
and
PK
and
YL/BK
and PK

WT
and
PK,
DB/WT
and
BK
and
DB
&
BK

YL/BK
and
BK, YL
and
BK WT and PK
WT
and
BK, DB/WT
and PK
DB
and
PK
MIRROR SELECTOR KNOB
IN "R"
POSITION Move
Lever Continuity Between

WT/BK
and
BK,
YL and PK
YL/BK
and PK

•
WT/BK
and
PK, DB
and
BK
DB/WT
and
BK
WT/BK
and
PK, YL
and
BK
YL/BK
and
BK

«
WT/BK
and
BK, DB
and PK

DB/WT
and PK

J928T-6
SERVICE PROCEDURES

MIRROR
SWITCH REMOVAL AND INSTALLATION
(1) Disconnect negative cable from battery.
(2) Remove 2 screws holding map lamp and re­
move map lamp. (3) Remove 6 screws which attach instrument clus­
ter bezel to instrument panel (Fig. 2). Make sure the screw below the Heater/C control is removed.
INSTRUMENT

CLUSTER
BEZEL
J938E-51
Fig.
2 Instrument
Cluster
Bezel

(4) Place column shift lever in Position 1. (5) Remove bezel by pulling top edge rearward to
clear brow. Disengage attaching clips around bottom
of bezel and complete removal of bezel.
(6) If the bezel has a four wheel drive indicator, re­
move bulb socket as bezel is removed. (7) Disconnect message center wires.
(8) Remove instrument cluster bezel assembly.
(9) Pull headlamp switch to ON position.
(10) Reach under instrument panel and depress
button on side of switch while pulling stem out.
(11) Remove switch bezel retaining screws and pull
bezel out of instrument panel (Fig. 1). (12) Pull harness out through opening in instru­
ment panel and disconnect mirror switch connector.
(13) Remove 2 switch mounting-plate-to-bezel re­
taining screws.
(14) Remove switch-to-mounting-plate nut.
For Installation, reverse removal procedures.

MIRROR
ASSEMBLY
REMOVAL
AND

INSTALLATION
(1) Remove remote control handle (Fig. 3).
(2) Remove power window/lock switch by inserting
a standard blade screwdriver into notch on forward
end of switch housing and push to depress locking

tab.
Pull out and forward to remove switch bezel
from door panel.

8U
- 2
CHIME/BUZZER
WARNING SYSTEMS
•
TERMINAL
7

TO
B
+
TERMINAL
6

TO DOOR SWITCH
KEY
IN
SWITCH
AND
HEADLAMP
ON
SWITCH
!cO=f
Mi c£K
*£h

• CZ3
EZZ3
EZI 1

TERMINAL
4

TO SEAT BELT
BUCKLE SWITCH TERMINAL
1

TO
IGNITION
SWITCH
TERMINAL
3

TO GROUND TERMINAL
2

TO SEAT BELT
WARNING
LIGHT
J928U-12

Fig.
2
Buzzer
Module
Connector
Terminal

Identification—Front
View

LIGHTS-ON/KEY-IN-IGNITION
WARNING
BATTERY
(+)
IS SI S K|
IGNITION
SEAT BELT
WARNING
LIGHT
GROUND SEAT BELT
SWITCH
J928U-9

Fig.
3
Buzzer
Module
Terminal
Identification—Front

View RESISTANCE TESTS

CAUTION:
Before making resistance measurements,

turn
ignition switch
OFF and
disconnect negative cable from
battery
to
avoid damaging ohmmeter.

Measure between the following pins and vehi­
cle ground.
• Buzzer module connector pin 2. Meter should read almost zero ohms (bulb filament). If not, replace seat
belt indicator bulb.
• Buzzer module connector pin 3. Meter should read
zero ohms. If not, repair open to ground. • Buzzer module connector pin 4. Drivers seat belt
not buckled. Meter should read zero ohms. If not, re­
pair open to ground (or buckle switch may be defec­
tive).
Meter should read open circuit if drivers seat
belt is buckled. If not, repair short to ground (or buckle switch may be defective).
• Buzzer module connector pin 6. Open driver's door,
key in ignition, (in OFF position). Meter should read
zero ohms. If not, repair open to ground.
• Buzzer/chime module connector pin 6. Open driv­
er's door, headlamp switch on, meter should read
zero ohms. If not, repair open to ground.
r—i
DOORSW

±
7
(SHOWN
DOOR
CLOSED)

rFY<;w M
UGHTS
SW

(SHOWN
KEW/
f(SHOWN^JGHTS
OFF)

#5 -^•^Y
BELT(I)

SW
LAMP
JL
SEAT
BELT
SW

/.
(SHOWN
-
BUCKLED)
IGN
SW

(SHOWN
IGN OFF)

PIN
VIEW
(SAME
AS
REAR
SIDE
[WIRE
SIDE]
CONNECTOR
VIEW)
X
=
Do Not Care

FUNCTION
DESCRIPTION

IGN.
SEAT

BELT
DRIVER'S

DOOR
KEY

HEAD

LAMPS

Seat
Belt
Reminder
4
to
8
Second

Tone and

Lamp
Output
^On

OP
Not
Bckld
X
X
X

Seat

Belt
Reminder
4
to
8
Second

Lamp
Output
Only
^On

OfP
Bckld

X X
X

Key
and
Head Lamp Reminder*
Continuous,

Steady
Tone
X
X
Open
In

X

Key
and
Head Lamp Reminder*
Continuous,

Steady
Tone
X
X
Open

X
On

*On
some
vehicles,
the key
switch
opens
when the ignition is switched on.
J928U-8

Fig.
4
Buzzer
Module
Schematic

o
o o o
4 3 2 1

WIRE
CAVITY APPLICATION
CONTINUITY

BETWEEN
1

2
Hdo
lamp

Halo
lamp
1
& 2
Almost
zero
ohms

(bulb
filament)

3
4
Key-in
warning switch

Key-in
warning switch
3
& 4
with
key in ignition
J918M-3

Fig.
5 Halo
Lamp
And
Key-In
Warning
Switch
Continuity Chart

G85 20TN/0R WATER-IN-FUEL

(SEE
SH 23) G9 20GY/BK REAR WHEEL
ANTI-LOCK BRAKE MODULE
(SEE
SH 33)
G9 20GY/BK PARK BRAKE WARNING SWITCH
(SEE
SH 33
G14 20PK/BK TO IGNITION SWITCH GROUND BULB TEST)

(SEE
SH 10)
Gil 20WT/BK
BRAKE
WARNING SWITCH
AND VACUUM SWITCH
(SEE
SH 33)
Gil 20WT/BK REAR WHEEL
ANTI-LOCK BRAKE MODULE
(SEE
SH 33) G86 20DG/WT WAIT-TO-START SWITCH

(SEE
SH 23)
B102 180R ANTI-LOCK MODULE
(SEE
SH 33)
G5 20DB/WT IGNITION-12V FEED
(SEE
SH 58)
Zl 22BK GROUND -1|SPLICE
SEE
SH 48)
G40 20LB/BK FUEL TANK
LOW FUEL SWITCH
(SEE
SH 77) AD 57

MESSAGE
CENTER
(DIESEL)
J938W-11

13 - 2
FRAME
AND
BUMPERS

•
Fig. 2 Standard Rear Bumper
(2) Remove the filler panel from the rear cross sill
and rear bumper.
INSTALLATION

(1) Position the filler panel lip under the rear
bumper. Position the flange against the rear cross
sill.

(2) Align the filler panel flange screw holes with
the sill holes. Install the screws. Tighten the screws
until the heads are seated.

TO SILL
BUMPER J9123-361
Fig. 3 Bumper Filler Panel
STEP BUMPER

REMOVAL
(1) Remove the wire harness clip retainers. Discon­
nect the bulb sockets from each license plate lamp.
Detach the wire harness from the step bumper (Fig.

4).

(2) Support the step bumper.
(3) Remove the nuts and bolts that attach each
bumper support bracket and brace to the frame rails (Fig. 5). (4) Lower the bumper and remove as a unit.
(5) Remove the bracket and brace bolts to the
bumper. Remove the brackets and braces from the
bumper (Fig. 5).

INSTALLATION
(1) Attach brackets and braces to the bumper with
the bolts and nuts. Tighten the support bracket nuts
to 68 N*m (50 ft. lbs.) torque. Tighten the brace nuts
to 41 N»m (30 ft. lbs.) torque.
(2) Position step bumper assembly to the rear of
the vehicle.
(3) Align the support bracket and brace holes with
the holes in the frame rails. Install the bracket at­
taching bolts and nuts. (4) Ensure that the bumper is correctly aligned
with the cargo box rear corner panels. Tighten to 68 N«m (50 ft. lbs.) torque.
(5) Connect the license plate lamp bulb sockets to
the lamps. Attach the wire harness to the bumper
with the clip retainers (Fig. 4). (6) Remove the support from the bumper.

LOCATOR
LAMP
CLIP WIRE

BUMPER SCREW J9123429
Fig. 4 License Plate Lamp Wire Harness Fig. 5 Rear Step Bumper

•

FUEL SYSTEM
14 - 37 used only on vehicles equipped with the 5.9L heavy
duty cycle (HDC) engine. Refer to Group 25, Emis­
sion Control System for information.

EVAP CANISTER PURGE SOLENOID-PCM

OUTPUT
Refer to Group 25, Emission Control System. See
EVAP Canister Purge Solenoid.

FUEL INJECTORS-PCM
OUTPUT
The fuel injectors are attached to the fuel rail (Fig.

15).
3.9L engines use six injectors. 5.2L and 5.9L en­
gines use eight injectors. The nozzle ends of the injectors are positioned into
openings in the intake manifold just above the in­
take valve ports of the cylinder head. The engine
wiring harness connector for each fuel injector is equipped with an attached numerical tag (INJ 1, INJ 2 etc.). This is used to identify each fuel injector with
its respective cylinder number. The injectors are energized individually in a se­
quential order by the powertrain control module (PCM). The PCM will adjust injector pulse width by
switching the ground path to each individual injector
on and off. Injector pulse width is the period of time
that the injector is energized. The PCM will adjust injector pulse width based on various inputs it re­
ceives. During start up, battery voltage is supplied to the
injectors through the ASD relay. When the engine is
operating, voltage is supplied by the charging sys­
tem. The PCM determines injector pulse width based on various inputs.
FUEL

INJECTOR
J9214-30

Fig.
15
Fuel
injectors—Typical
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.

IGNITION COIL-PCM OUTPUT
System voltage is supplied to the ignition coil pos­
itive terminal. The powertrain control module (PCM)
operates the ignition coil. Base (initial) ignition
timing is not adjustable. The PCM adjusts ignition
timing to meet changing engine operating conditions. The ignition coil is located near the front of the
right cylinder head (Fig. 16 or 17). Refer to Group 8D, Ignition System for additional
information.

Fig.
16 Ignition Coii-3.9U5.2U5.9L
LDC-Gas
Engine

SCI
TRANSMIT—PCM OUTPUT
SCI Transmit is the serial data communication
transmit circuit for the DRB II scan tool. The power- train control module (PCM) transmits data to the DRB II through the SCI Transmit circuit.

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.

•
^ ^ —
BODY COMPONENTS
23 - 49

HEADLINER ROOF
INNER PANEL
ROOF
INNER PANEL

SCREW
ROOF
RAIL
HEADER

TRIM
PANEL HEADLINER

J9123-353

Fig.
40
Cloth-Covered
Molded
Cab Headliner

ROOF
INNER PANEL RETAINER RAIL
CENTERING HOLE

REAR

HEADLINER
RETAINER PERIMETER
RETAINER
INSTALLATION
TRIM

'MOULDING

J9123-358

Fig.
41
Ramcharger
Headliner
INNER
BACK

PANEL
ROOF
—

INNER
PANEL
REAR

WINDOW

UPPER
TRIM

SUNVISOR SUNVISOR
AND WINDSHIELD HEADER
TRIM
DOME LAMP LENSE
DOME AND
WINDOW
TRIM
LAMP

LENSE
J9l
23-352

Fig.
42 Ram
Truck/Chassis
Cab
Sunvisor
&
Dome
Lamp
ROOF
INNER
v
PANEL


SIDE

TRIM

MOULDING
HEADLINER

RETAINER
RAIL

FRONT

HEADLINER

SCREW

SIDE
OF VEHICLE ROOF INNER PANEL
WINDSHIELD
WEATHERSTRIP
SEAL
ROOF
INNER PANEL

REAR

HEADLINER

SCREW
RETAINER SNAP-ON

TRIM
MOULDING
ENDCAP CENTER OF VEHICLE

FRONT

HEADLINER
REAR

HEADLINER ROOF INNER
PANEL WINDSHIELD
HEADER
TRIM

MOULDING

FRONT
OF VEHICLE
SCREW

SCREW

SUN VISOR SCREW
REAR
TRIM

ARM
MOULDING
REAR
OF VEHICLE

J9123-359
Fig.
43
Ramcharger
Sunvisor
& Headliner
Trim

Moulding

ROOF
INNER PANEL
BRACKET

BULB

HOLDER DOME
LAMP
BRACKET

HEADLINER
LENSE
DOME LAMP

WITH
HEADLINER
SCREW

DOME LAMP CLUB CAB
BULB

HOLDER
J9123-401

Fig.
44 Ram
Truck/Chassis
Cab
Dome
Lamps

DOME/READING LAMP

REMOVAL
(1) Squeeze the dome lamp lense to remove it from
the bracket.
(2) If applicable, remove the lense bracket screws.
(3) Remove the lense bracket from the headliner
and roof inner panel. (4) Disconnect the bulb holder wire harness con­
nectors (Fig. 44). (5) Remove the lense, bulb holder and bracket
from the roof inner panel.

INSTALLATION
(1) Position the dome/reading lense, bulb holder
and lense bracket to the roof inner panel.