Ground DODGE RAM 1999 Service Repair Manual

Hazard Warning Lights Okay To Front Lights Only
Faulty external bulbs. Faulty contact in turn signal/hazard
switch. Open circuit between hazard switch and turn signal switch.
Open or grounded circuit in wiring to rear lights.
Hazard Warning Lights Okay To Rear Lights Only
Faulty external bulbs. Faulty contact in turn signal/hazard
switch. Open or grounded circuit in wiring to front lights.
Indicator Light Inoperative, External Lights Okay
Burned-out indicator bulb in instrument cluster. Faulty
contact. Open circuit.
Indicator Light Okay, External Lights Inoperative
Open circuit in wiring to external light(s).
Indicator Light Okay, External Lights Glow Dimly Or Do Not
Flash
Loose or corroded external light connections. Poor ground
circuit at external light(s).
Turn Signals Do Not Cancel After Turn
Broken canceling pawl on turn signal switch. Improperly
aligned canceling cam. Broken or loose canceling cam.
Turn Signals Inoperative (Both Sides)
Blown fuse. Faulty turn signal flasher. Loose bulkhead
connector. Loose or faulty rear wiring harness or terminals. Open
circuit to turn signal flasher. Open circuit in feed wire to turn
signal switch. Faulty switch connections. Open or grounded circuit in
wiring to external lights.
Turn Signal Inoperative (One Side)
Faulty external bulb. Poor ground at external light. Open
circuit in wiring to external light(s). Faulty turn signal/hazard
switch.
COMPONENT TESTS
CAUTION: When battery is disconnected, vehicle computer and memory
systems may lose memory data. Driveability problems may exist
until computer systems have completed a relearn cycle. See
COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION
before disconnecting battery.
NOTE: For additional testing procedures, see appropriate CRUISE
CONTROL SYSTEMS and WIPER/WASHER SYSTEMS articles.
NOTE: For component locations, see COMPONENT LOCATIONS.
HORN RELAY
1) Remove horn relay from Power Distribution Center (PDC).
Use label on PDC cover to identify and locate relay. Check continuity
between relay terminals No. 87A and 30. See Fig. 1. If continuity does
not exist, replace relay. If continuity exists, go to next step.
2) Check continuity between relay terminals No. 30 and 87. If
continuity exists, replace relay. If continuity does not exist, check
resistance between relay terminals No. 85 and 86. If resistance is not
70-80 ohms, replace relay. If resistance is 70-80 ohms, go to next
step.
3) Using jumper wires, connect positive battery voltage to

relay terminal No. 86 and ground to relay terminal No. 85. Continuity
should exist between terminals No. 30 and 87. Continuity should not
exist between relay terminals No. 87A and 30. If continuity is not as
specified, replace relay. If continuity is as specified, relay is
okay. Go to HORN RELAY CIRCUIT test under SYSTEM TESTS.
Fig. 1: Identifying Horn Relay Terminals
Courtesy of Chrysler Corp.
IGNITION SWITCH
NOTE: For ignition switch circuit identification, see IGNITION
SWITCH CIRCUIT FUNCTIONS table.
Remove ignition switch. See IGNITION SWITCH under REMOVAL &
INSTALLATION. Check continuity between appropriate ignition switch
terminals with switch in specified position. See IGNITION SWITCH
CONTINUITY table. See Fig. 2.
IGNITION SWITCH CONTINUITY









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Switch Position Continuity Between Terminals
ACC .......................................................... 6 & 7
OFF ............................................................ ( 1)
RUN ............................................ 2 & 7; 4 & 5; 6 & 7
START ............................................. ( 2) 1 & 7; 2 & 7
( 1) - Continuity should not exist between any terminals with key
removed.
( 2) - Continuity should also exist between terminal No. 3 and case

ground.








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IGNITION SWITCH CIRCUIT FUNCTIONS








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Terminal No. (Wire Color) Circuit\
1 (DK BLU/YEL) ...................... Ignition Switch Output (START\
)
2 (DK BLU) ...................... Ignition Switch Output (START/RUN\
)
3 (GRY/BLK) (1) ..................... Red Brake Warning Light Driver
4 (PNK/BLK) ............................... Battery Feed To Ignition\
5 (BLK/ORG) ........................... Ignition Switch Output (RUN\
)
6 (BLK/WHT) ....................... Ignition Switch Output (ACC/RUN\
)
7 (RED) ................................... Battery Feed To Ignition\
( 1) - White wire on Dakota and Durango.









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Fig. 2: Identifying Ignition Switch Connector Terminals (Harness
Side)
Courtesy of Chrysler Corp.
MULTIFUNCTION SWITCH
Turn Signal/Hazard Warning Switch
Disconnect negative battery cable. Remove multifunction
switch. See MULTIFUNCTION SWITCH under REMOVAL & INSTALLATION. Check
continuity between appropriate multifunction switch terminals with
switch in specified position. See MULTIFUNCTION SWITCH TURN SIGNAL
TESTING table. See Fig. 3. If continuity is not as specified, replace
multifunction switch.
MULTIFUNCTION SWITCH TURN SIGNAL TESTING









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Switch Position Continuity Between Terminals
Neutral
Hazard Warning On ............................ 11, 12, 13, 15 & 16
Hazard Warning Off ................................... 12, 14 & 15
Left .......................................... 12 & 14; 15, 16 & 17
Right ......................................... 14 & 15; 11, 12 & 17
Optional Corner Lights
Left ..................................................... 22 & 23
Right .................................................... 23 & 24









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Fig. 3: Identifying Multifunction Switch Terminals
Courtesy of Chrysler Corp.
SYSTEM TESTS
HORN
1) Check resistance between horn mounting bracket and ground.
If resistance is zero ohms, go to next step. If resistance is not zero
ohms, repair horn ground connection.
2) Check for battery voltage at horn harness connector when
horn switch is pressed. If battery voltage exists, replace horn. If
battery voltage does not exist, go to next step.
3) Test horn relay. See HORN RELAY under COMPONENT TESTS. If
relay is okay, check horn circuit. See HORN RELAY CIRCUIT. If relay is
not okay, replace horn relay.
HORN RELAY CIRCUIT
1) Remove horn relay from Power Distribution Center (PDC).
Measure voltage between ground and horn relay terminals No. 30 and 86
in PDC. See Fig. 4. If battery voltage exists at both terminals, go to
next step. If battery voltage does not exist at one or both terminals,
repair open circuit to PDC.
2) Disconnect both horn connectors. Check continuity between
horn relay terminal No. 87 in PDC and Dark Green/Red wire at each horn
harness connector. If continuity exists, go to next step. If
continuity does not exist, repair open in Dark Green/Red wire.
3) Check continuity between ground and relay terminal No. 85
in PDC. With horn switch depressed, continuity should exist. With horn
switch released, continuity should not exist. If continuity is not as
specified, go to HORN SWITCH. If continuity is as specified, no fault
is indicated in relay circuits.

Fig. 4: Identifying Horn Relay Terminals In PDC
Courtesy of Chrysler Corp.
HORN SWITCH
1) Disconnect negative battery cable. Remove steering column
opening cover from instrument panel. Check continuity between ground
and metal steering column jacket. If continuity exists, go to next
step. If continuity does not exist, check for proper installation of
steering column mounting nuts.
2) Disable air bag system and remove driver's air bag module.
See appropriate AIR BAG RESTRAINT SYSTEMS article. Remove horn relay
from Power Distribution Center (PDC). Use label on PDC cover to
identify and locate relay. Check continuity between horn relay
terminal No. 85 in PDC and Black/Red wire at steering column horn

switch connector. See Fig. 4. If continuity does not exist, repair
open Black/Red wire. If continuity exists, go to next step.
3) Check continuity between ground and Black/Red wire at
steering column horn switch connector. If continuity does not exist,
go to next step. If continuity exists, repair short to ground in
Black/Red wire.
4) Continuity between horn switch terminal and ground.
Continuity should exist with horn switch depressed. Continuity should
not exist without horn switch depressed. If continuity is not as
specified, replace horn switch. If continuity is as specified, install
horn relay and go to HORN under COMPONENT TESTS.
TURN SIGNAL & HAZARD WARNING SYSTEMS
1) If bulbs burn out rapidly, check charging system for
overcharging condition. See appropriate GENERATORS & REGULATORS
article in STARTING & CHARGING SYSTEMS. If charging system is okay, go
to next step. If charging system is not okay, repair as necessary.
2) If problem is turn signals failing to cancel after a turn,
inspect multifunction switch or cancelling cam lobes on clockspring
for damage or improper installation. If problem exists, repair as
necessary. If problem does not exist, go to next step.
3) Turn ignition on. Actuate turn signal switch or hazard
warning switch. Observe turn signal indicator light(s) in instrument
cluster. If flash rate is very high, check for a bulb that is not lit
or is dimly lit. Repair circuit or replace bulb as necessary. If turn
signals fail to light, go to next step.
4) Turn ignition off. Check turn signal fuse in junction
block and/or hazard warning fuse in PDC. If fuses are okay, go to next
step. If either fuse is blown, repair short circuit and replace fuse.
5) Check for battery voltage at hazard warning fuse in PDC.
Turn ignition on. Check for battery voltage at turn signal fuse in
junction block. If battery voltage exists, go to next step. If battery
voltage does not exist, repair open circuit to battery or ignition
switch as necessary.
6) Turn ignition off. Disconnect negative battery cable.
Remove combination flasher from junction block and replace with a
known good unit. Connect battery cable and test operation of turn
signal and hazard warning systems. If operation is okay, discard
faulty flasher. If operation is not okay, go to next step.
7) Turn ignition on. Check for battery voltage at combination
flasher terminals No. 51 and 48 in junction block. If battery voltage
exists, go to next step. If battery voltage does not exist, repair
open circuit to fuse in junction block or PDC as necessary.
8) Disconnect negative battery cable. Check continuity
between combination flasher terminal No. 50 and ground. If continuity
exists, go to next step. If continuity does not exist, repair open
ground circuit.
9) Disconnect multifunction switch harness connector. Check
continuity between junction block terminal No. 4 and multifunction
switch terminal No. 13 (Pink wire). If continuity exists, go to next
step. If continuity does not exist, repair open in Pink wire between
multifunction switch and junction block.
10) Check continuity between junction block terminal No. 13
and multifunction switch terminal No. 17 (Red/White wire). If
continuity exists, test multifunction switch. See MULTIFUNCTION SWITCH
under COMPONENT TESTS. If continuity does not exist, repair open in
Red/White wire between junction block and multifunction switch.
REMOVAL & INSTALLATION
WARNING: Deactivate air bag system before performing any service

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AIR RIDE SUSPENSION - WARNING LAMPS
AIR RIDE SUSPENSION - WARNING LAMP INSPECTION








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Condition Code Procedure
Bulb burned out ......... A ............ Require replacement.
Warning light does
not come on during
bulb check ............. .. . Further inspection required to
determine cause.
Warning light flashes ... .. . Further inspection required to
determine cause.
Warning light is
intermittent ........... .. . Further inspection required to
determine cause.
Warning light stays
on after initial
bulb check ............. .. . Further inspection required to
determine cause.









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AIR RIDE SUSPENSION - WIRING HARNESSES
AIR RIDE SUSPENSION - WIRING HARNESS INSPECTION








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Condition Code Procedure
Connector bent .......... A .. Require repair or replacement.
Connector broken ........ A .. Require repair or replacement.
Connector loose ......... A .. Require repair or replacement.
Damaged (cut, burned, or
chafed) ................ A .. Require repair or replacement.
Excessive resistance .... B .. Require repair or replacement.
Fuse blown .............. A ............ Require replacement.
Fusible link blown ...... A ............ Require replacement.
Open .................... A .. Require repair or replacement.
Poor ground ............. A .. Require repair or replacement.
Routed incorrectly ...... B .. Require rerouting according to
vehicle manufacturer's
specifications.
Shorted ................. A .. Require repair or replacement.
Terminal bent ........... A .. Require repair or replacement.
Terminal broken ......... A .. Require repair or replacement.
Terminal corroded ....... A .. Require repair or replacement.
Terminal loose .......... A .. Require repair or replacement.









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BALL JOINTS
Before requiring or suggesting ball joint replacement, the
approved OEM procedure must be used to measure ball joint wear. The
measurement(s) obtained, along with the vehicle manufacturer's
specifications, must be noted on the inspection report. Some states
require that these measurements also appear on the invoice.
NOTE: The term "perceptible movement," defined as any visible
movement in any direction, has been the industry standard
for determining the need for replacement of follower ball
joints. Some vehicle manufacturers are now publishing
specifications for follower ball joints that were

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AIR RIDE SUSPENSION - WARNING LAMPS
AIR RIDE SUSPENSION - WARNING LAMP INSPECTION








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Condition Code Procedure
Bulb burned out ......... A ............ Require replacement.
Warning light does
not come on during
bulb check ............. .. . Further inspection required to
determine cause.
Warning light flashes ... .. . Further inspection required to
determine cause.
Warning light is
intermittent ........... .. . Further inspection required to
determine cause.
Warning light stays
on after initial
bulb check ............. .. . Further inspection required to
determine cause.









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AIR RIDE SUSPENSION - WIRING HARNESSES
AIR RIDE SUSPENSION - WIRING HARNESS INSPECTION








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Condition Code Procedure
Connector bent .......... A .. Require repair or replacement.
Connector broken ........ A .. Require repair or replacement.
Connector loose ......... A .. Require repair or replacement.
Damaged (cut, burned, or
chafed) ................ A .. Require repair or replacement.
Excessive resistance .... B .. Require repair or replacement.
Fuse blown .............. A ............ Require replacement.
Fusible link blown ...... A ............ Require replacement.
Open .................... A .. Require repair or replacement.
Poor ground ............. A .. Require repair or replacement.
Routed incorrectly ...... B .. Require rerouting according to
vehicle manufacturer's
specifications.
Shorted ................. A .. Require repair or replacement.
Terminal bent ........... A .. Require repair or replacement.
Terminal broken ......... A .. Require repair or replacement.
Terminal corroded ....... A .. Require repair or replacement.
Terminal loose .......... A .. Require repair or replacement.









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BALL JOINTS
Before requiring or suggesting ball joint replacement, the
approved OEM procedure must be used to measure ball joint wear. The
measurement(s) obtained, along with the vehicle manufacturer's
specifications, must be noted on the inspection report. Some states
require that these measurements also appear on the invoice.
NOTE: The term "perceptible movement," defined as any visible
movement in any direction, has been the industry standard
for determining the need for replacement of follower ball
joints. Some vehicle manufacturers are now publishing
specifications for follower ball joints that were


I - S YSTE M /C O M PO NEN T T E STS

1999 D odge P ic ku p R 1500
1999 ENGINE PERFORMANCE
CHRY - System & Component Testing - Trucks - Diesel
Ram Pickup
INTRODUCTION
Before testing separate components or systems, perform
procedures in BASIC DIAGNOSTIC PROCEDURES - TRUCKS - DIESEL article.
Since many computer-controlled and monitored components set a
diagnostic trouble code if they malfunction, also perform procedures
in SELF-DIAGNOSTICS - JEEP, TRUCKS & RWD VANS article.
NOTE: Testing individual components does not isolate short or open
circuits. Perform all voltage tests with a Digital Volt
-Ohmmeter (DVOM) with a minimum 10-megohm input impedance,
unless stated otherwise in test procedure. Use ohmmeter to
isolate shorted or open wiring harness.
AIR INDUCTION SYSTEMS
INTAKE MANIFOLD AIR HEATER SYSTEM
For testing information on intake manifold air heater system,
perform procedures in SELF-DIAGNOSTICS - JEEP, TRUCKS & RWD VANS
article.
INTERCOOLER
Cleaning and inspection procedures for intercooler is the
only information available from manufacturer. See INTERCOOLER under
AIR INDUCTION SYSTEMS in REMOVAL, OVERHAUL & INSTALLATION - TRUCKS -
DIESEL article.
TURBOCHARGER
NOTE: Manufacturer does not recommend turbocharger disassembly.
Turbocharger overhaul should be performed only by an
authorized repair facility.
Turbocharger Boost Pressure
Turbocharger boost pressure testing information is not
available at time of publication.
TURBOCHARGER WASTEGATE
See CONTROL ROD ADJUSTMENT under TURBOCHARGER WASTEGATE in
ON-VEHICLE ADJUSTMENTS - TRUCKS - DIESEL article.
COMPUTERIZED ENGINE CONTROLS
POWERTRAIN CONTROL MODULE (PCM)
The PCM is located on firewall at passenger's side rear
corner of engine compartment. See Fig. 1. The PCM power and ground
circuits may be checked by performing specified test. See DTC P0601 in
SELF-DIAGNOSTICS - JEEP, TRUCKS & RWD VANS article.


I - S YSTE M /C O M PO NEN T T E STS - R W D - G ASO LIN E

1999 D odge P ic ku p R 1500
1999 ENGINE PERFORMANCE
CHRY - System & Component Testing - Trucks & RWD Vans - Gas
Dodge: Dakota, Durango, Ram Pickup, Ram Van, Ram Wagon
Jeep Cherokee, Grand Cherokee, Wrangler
INTRODUCTION
Before testing individual components or systems, perform
procedures in BASIC DIAGNOSTIC PROCEDURES - TRUCKS & RWD VANS -
GASOLINE article. Since many computer controlled and monitored
components set a fault message if they malfunction, also perform
procedures in SELF-DIAGNOSTICS - JEEP, TRUCKS & RWD VANS article.
NOTE: Testing of individual components does not isolate possible
shorts or opens in wiring harness of electronically
controlled systems. Perform all voltage tests using a Digital
Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance\
unless otherwise instructed in procedure. Use an ohmmeter to
isolate wiring harness shorts or opens.
COMPUTERIZED ENGINE CONTROLS
POWERTRAIN CONTROL MODULE (PCM)
PCM power and ground circuits may be checked by performing
TEST NS-1 in SELF-DIAGNOSTICS - JEEP, TRUCKS & RWD VANS article. For
PCM location, see PCM LOCATION table.
PCM LOCATION









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Application Location
Dakota & Durango ................. Right Front Fender, Near Firewall
Ram Pickup, Ram Van & Ram Wagon ...... On Firewall, Near Wiper Motor









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ENGINE SENSORS, SOLENOIDS & SWITCHES
SENSORS
Camshaft Position (CMP) Sensor
See appropriate DTC P0340: NO CAM SIGNAL AT PCM test in SELF-
DIAGNOSTICS - JEEP, TRUCKS & RWD VANS article.
Crankshaft Position (CKP) Sensor
See appropriate DTC P0320: NO CRANK REFERENCE SIGNAL AT PCM
test in SELF-DIAGNOSTICS - JEEP, TRUCKS & RWD VANS article.
Engine Coolant Temperature (ECT) Sensor
See appropriate DTC P0117: ECT SENSOR VOLTAGE TOO LOW and DTC
P0118: ECT SENSOR VOLTAGE TOO HIGH tests in SELF-DIAGNOSTICS - JEEP,
TRUCKS & RWD VANS article.
Heated Oxygen Sensor (HO2S)
See appropriate DTC for oxygen sensor in SELF-DIAGNOSTICS -
JEEP, TRUCKS & RWD VANS article.