DODGE RAM 1999 Service Repair Manual

NOTE: Oil pressure sensor may also be referred to as engine oil
pressure sensor.
Removal & Installation
For oil pressure sensor location, see OIL PRESSURE SENSOR
LOCATION table. Service information is not available from
manufacturer.
OIL PRESSURE SENSOR LOCATION









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Application Location
Dakota
2.5L ... ( 1) Passenger's Side Of Cylinder Block, Below Distributor
3.9L, 5.2L & 5.9L ... ( 1) Passenger's Side Rear Corner Of Cylinder
Block, Below Distributor
Durango .. ( 1) Passenger's Side Rear Corner Of Cylinder Block, Below
Distributor
Ram Pickup
3.9L, 5.2L & 5.9L ... ( 2) Passenger's Side Rear Corner Of Cylinder
Block, Below Distributor
8.0L ......................................... ( 2) Near Oil Filter
Ram Van & Ram Wagon ... ( 3) Passenger's Side Rear Corner Of Cylinder
Block, Below Distributor
( 1) - Contains a Gray/Yellow wire and a Black/Light Blue wire in the
electrical connector.
( 2) - Contains a Gray/Orange wire and a Black/Light Blue wire in the
electrical connector.
( 3) - Contains a Gray wire and a Black/Light Blue wire in the
electrical connector.









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OUTPUT SHAFT SPEED SENSOR
NOTE: Output shaft speed sensor may also be referred to as
transmission speed sensor.
Removal & Installation (A/T Models)
Output shaft speed sensor is located on lower edge of
overdrive case on rear of transmission. See Fig. 10. Disconnect
electrical connector at output shaft speed sensor. Remove output shaft
speed sensor with "O" ring from transmission. To install, reverse
removal procedure using NEW "O" ring.
Fig. 10: Locating Output Shaft Speed Sensor & Park/Neutral Switch
(A/T)
Courtesy of Chrysler Corp.
PARK/NEUTRAL SWITCH

NOTE: Park/neutral switch may also be referred to as park/neutral
position switch.
Removal (A/T Models)
Raise and support vehicle. Disconnect 3-pin electrical
connector from park/neutral switch. Park/neutral switch is located on
driver's side of transmission case, near shift linkage. See Fig. 10.
Unscrew park/neutral switch from transmission case. Remove seal ring
from park/neutral switch.
Installation
1) Apply parking brake. Place shift lever in Neutral. Ensure
park/neutral switch operating levers in transmission are centered in
the park/neutral switch opening on transmission case.
2) Using NEW seal ring, install park/neutral switch. Tighten
park/neutral switch to specification. See TORQUE SPECIFICATIONS.
Install electrical connector. Add Mopar Plus 7176 ATF as necessary.
POWER STEERING PRESSURE SWITCH
Removal & Installation (Dakota 2.5L)
1) Power steering pressure switch is located in pressure line
near power steering pump. See Fig. 11. Disconnect electrical connector
at power steering pressure switch.
2) Place small container below power steering pressure switch
to collect power steering fluid. Remove power steering pressure switch
from pressure line while using a back-up wrench to prevent damage to
pressure line.
3) To install, reverse removal procedure. Tighten power
steering pressure switch to specification. See TORQUE SPECIFICATIONS.
Check and fill power steering pump with Mopar Power Steering Fluid if
necessary. DO NOT use ATF in power steering pump.
Fig. 11: Locating Power Steering Pressure Switch (Dakota 2.5L)
Courtesy of Chrysler Corp.
POWER TAKE-OFF (PTO) SWITCH

Removal & Installation (Ram Pickup)
PTO switch is used on models only with after market PTO
units. PTO switch delivers an input signal to Powertrain Control
Module (PCM) to indicate when PTO is engaged. The PCM will disable
certain OBD-II systems when PTO is engaged. No other service
information is available from manufacturer.
THROTTLE POSITION (TP) SENSOR
Removal (Dakota, Durango, Ram Pickup 3.9L, 5.2L & 5.9L, Ram
Van & Ram Wagon)
The TP sensor is located on side of throttle body. On Ram Van
and Ram Wagon, remove engine cover. On all models, remove air inlet
duct at throttle body for access to TP sensor. Disconnect electrical
connector at TP sensor. Remove retaining bolts and TP sensor.
Installation
1) Throttle shaft on throttle body slides into socket on TP
sensor. Throttle shaft rests against tabs in socket on TP sensor. See
Fig. 12 .
2) Install TP sensor on throttle body. When properly
installed, TP sensor should rotate a few degrees so retaining bolts
may be installed. Slight tension should exist on TP sensor when
rotating TP sensor.
3) If difficult to rotate TP sensor into position when
aligning retaining bolts, remove TP sensor. Reinstall TP sensor so
throttle shaft is on the other side of tabs in socket on TP sensor.
Tighten retaining bolts for TP sensor to specification. See TORQUE
SPECIFICATIONS.
4) Operate throttle lever on throttle body to ensure no
binding exists in TP sensor. Install electrical connector and air
inlet duct or air cleaner assembly.
Removal (Ram Pickup 8.0L)
The TP sensor is located on side of throttle body. Remove air
inlet duct at air cleaner assembly. Remove cover from air cleaner
assembly. Remove air cleaner housing-to-throttle body nuts and air
cleaner housing from throttle body. Disconnect electrical connector at
TP sensor. Remove retaining bolts and TP sensor.
Installation
1) Throttle shaft on throttle body slides into socket on TP
sensor. Throttle shaft rests against tabs in socket on TP sensor. See
Fig. 12 .
2) Install TP sensor on throttle body. When properly
installed, TP sensor should rotate a few degrees so retaining bolts
may be installed. Slight tension should exist on TP sensor when
rotating TP sensor.
3) If difficult to rotate TP sensor into position when
aligning retaining bolts, remove TP sensor. Reinstall TP sensor so
throttle shaft is on the other side of tabs in socket on TP sensor.
Tighten retaining bolts for TP sensor to specification. See TORQUE
SPECIFICATIONS.
4) Operate throttle lever on throttle body to ensure no
binding exists in TP sensor. To install remaining components, reverse
removal procedure. Tighten air cleaner housing-to-throttle body nuts
to specification. See TORQUE SPECIFICATIONS.

Fig. 12: Installing Typical TP Sensor
Courtesy of Chrysler Corp.
TRANSMISSION GOVERNOR PRESSURE SENSOR
Removal & Installation (A/T Models)
Transmission governor pressure sensor is located in governor
body on transmission valve body. See appropriate ELECTRONIC CONTROLS
article in AUTOMATIC TRANSMISSIONS section.
TRANSMISSION OVERDRIVE SWITCH
NOTE: Transmission overdrive switch may also be referred to as
overdrive/override switch, OD switch or overdrive off
switch.
Removal & Installation (A/T Models)
Transmission overdrive switch is located on end of gear shift
lever. Service information is not available from manufacturer.
TRANSMISSION SPEED SENSOR
Removal & Installation (A/T Models)
Transmission speed sensor may also be referred to as output
shaft speed sensor. See OUTPUT SHAFT SPEED SENSOR under ENGINE SENSORS
& SWITCHES.

TRANSMISSION TEMPERATURE SENSOR
Removal & Installation (A/T Models)
Transmission temperature sensor is located on transmission
valve body, incorporated into governor pressure sensor. See
appropriate ELECTRONIC CONTROLS article in AUTOMATIC TRANSMISSIONS
section.
UPSTREAM OXYGEN SENSOR
NOTE: Upstream oxygen sensor may also be referred to as pre
-catalyst oxygen sensor.
Removal
Upstream oxygen sensor is mounted on exhaust pipe, in front
of catalytic converter. Raise and support vehicle. Disconnect
electrical connector for upstream oxygen sensor. Using Socket
(YA8875), remove upstream oxygen sensor from exhaust pipe.
Installation
1) If installing original or used upstream oxygen sensor,
apply anti-seize compound on threads of upstream oxygen sensor. A NEW
upstream oxygen sensor should already be coated with anti-seize
compound.
2) Install and tighten upstream oxygen sensor to
specification. See TORQUE SPECIFICATIONS. Install electrical
connector.
MOTORS, RELAYS & SOLENOIDS
IDLE AIR CONTROL (IAC) MOTOR
Removal & Installation (Dakota, Durango, Ram Pickup 3.9L,
5.2L & 5.9L, Ram Van & Ram Wagon)
1) IAC motor is located on throttle body and contains a 4-pin
electrical connector. On Ram Van and Ram Wagon, remove engine cover.
2) On all models, remove air inlet duct or air cleaner
assembly for access to IAC motor. Disconnect electrical connector at
IAC motor. Remove retaining bolts and IAC motor from throttle body.
3) To install, reverse removal procedure. Tighten IAC motor
retaining bolts to specification. See TORQUE SPECIFICATIONS.
Removal & Installation (Ram Pickup 8.0L)
1) IAC motor is located at rear of throttle body and contains
a 4-pin electrical connector. Remove air inlet duct at air cleaner
assembly. Remove cover from air cleaner assembly.
2) Remove air cleaner housing-to-throttle body nuts and air
cleaner housing from throttle body. Disconnect electrical connector at
IAC motor. Remove retaining bolts and IAC motor.
3) To install, reverse removal procedure. Tighten IAC motor
retaining bolts and air cleaner housing-to-throttle body nuts to
specification. See TORQUE SPECIFICATIONS.
A/C RELAY, AUTO SHUTDOWN (ASD) RELAY & FUEL PUMP RELAY
NOTE: A/C relay may also be referred to as A/C clutch relay or A/C
compressor clutch relay.
Removal & Installation
Relays are located in Power Distribution Center (PDC). Relays\
may be identified by label on inside of PDC cover. See POWER
DISTRIBUTION CENTER (PDC) LOCATION table.

POWER DISTRIBUTION CENTER (PDC) LOCATION








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Application Location
Dakota & Durango .............. Driver's Side Of Engine Compartment,
Behind Battery
Ram Pickup .................... Driver's Side Of Engine Compartment,
Above Wheelwell
Ram Van & Ram Wagon ........... Driver's Side Of Engine Compartment,
Near Battery









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STARTER RELAY & TRANSMISSION RELAY
NOTE: Transmission relay may also be referred to as transmission
control relay.
Removal & Installation
Relay is located in Power Distribution Center (PDC). Relays
may be identified by label on inside of PDC cover. See POWER
DISTRIBUTION CENTER (PDC) LOCATION table.
EVAP PURGE SOLENOID
NOTE: EVAP purge solenoid may also be referred to as EVAP canister
purge solenoid, duty cycle solenoid or proportional purge
solenoid.
Removal & Installation
See EVAP PURGE SOLENOID under EMISSION SYSTEMS.
TRANSMISSION GOVERNOR PRESSURE SOLENOID
NOTE: Transmission governor pressure solenoid may also be referred
to as governor pressure solenoid.
Removal & Installation (A/T Models)
Transmission governor pressure solenoid is located on
transmission valve body. See appropriate ELECTRONIC CONTROLS article
in AUTOMATIC TRANSMISSIONS section.
TRANSMISSION OVERDRIVE SOLENOID & TRANSMISSION TORQUE
CONVERTER CLUTCH (TCC) SOLENOID
NOTE: Transmission overdrive solenoid may also be referred to as
overdrive solenoid or 3-4 shift solenoid.
Removal & Installation (A/T Models)
Transmission overdrive solenoid and TCC solenoid are located
in solenoid assembly on transmission valve body. See appropriate
ELECTRONIC CONTROLS article in AUTOMATIC TRANSMISSIONS section.
IGNITION SYSTEM
CAMSHAFT POSITION SENSOR
Removal & Installation (Dakota, Durango, Ram Pickup 3.9L,
5.2L & 5.9L, Ram Van & Ram Wagon)
1) Camshaft position sensor is located in the distributor.
See Fig. 13 . Camshaft position sensor may be serviced without removing

the distributor.
2) On Ram Van and Ram Wagon, remove engine cover. On all
models, disconnect negative battery cable. Remove air cleaner
assembly. Remove distributor cap and distributor rotor.
3) Disconnect camshaft position sensor electrical wiring
harness. Lift camshaft position sensor from distributor housing.
4) To install, reverse removal procedure. Ensure tab on
bottom of camshaft position sensor engages with notch on distributor
housing.
Fig. 13: Exploded View Of Typical Distributor
Courtesy of Chrysler Corp.
Removal (Ram Pickup 8.0L)
1) Camshaft position sensor is located on driver's side of

the timing chain cover, near water pump pulley. See Fig. 14.
Disconnect electrical connector at camshaft position sensor.
2) Remove camshaft position sensor retaining bolt. Using 2
small screwdrivers, carefully pry camshaft position sensor with "O"
ring from timing chain cover by rocking camshaft position sensor back
and forth.
CAUTION: Camshaft position sensor installation procedure differs when
installing a NEW camshaft position sensor or the original or
used camshaft position sensor. Ensure proper installation
procedure is used when installing camshaft position sensor.
Camshaft sprocket contains a high and low machined area. See
Fig. 15. Before camshaft position sensor is installed,
camshaft sprocket may have to be rotated to allow high
machined area on camshaft sprocket to be aligned with
camshaft position sensor mounting hole opening on timing
chain cover. DO NOT install camshaft position sensor with low
machined area on camshaft sprocket aligned with camshaft
position sensor mounting hole opening on timing chain cover,
or camshaft shaft position sensor will be damaged when engine
is started.
Fig. 14: Locating Camshaft Position Sensor (Ram Pickup 8.0L)
Courtesy of Chrysler Corp.
Installation (NEW Camshaft Position Sensor)
1) Apply light coat of engine oil on camshaft position sensor
"O" ring. Using a 1/2" wide metal ruler, measure distance from the
surface at camshaft position sensor mounting hole opening on timing
chain cover to the camshaft sprocket. See Fig. 15.
2) If distance is about 1.818" (46.18 mm), go to step 3)).\
If

distance is about 2.018" (51.26 mm), rotate engine by using crankshaft\
vibration damper retaining bolt until distance from the surface at
camshaft position sensor mounting hole opening on timing chain cover
to the camshaft sprocket is about 1.818" (46.18 mm). This will put the\
high machined area on camshaft sprocket toward the camshaft position
sensor. Go to next step.
CAUTION: Ensure proper measurement is obtained before installing
camshaft position sensor. DO NOT install camshaft position
sensor with low machined area on camshaft sprocket aligned
with camshaft position sensor mounting hole opening on timing
chain cover, or camshaft shaft position sensor will be
damaged when engine is started.
3) Using a slight rocking action, lightly push camshaft
position sensor into timing chain cover until rib material at camshaft
end of camshaft position sensor contacts camshaft sprocket. DO NOT
twist camshaft position sensor during installation or "O" ring may be
damaged.
4) Install and tighten camshaft position sensor retaining
bolt to specification. See TORQUE SPECIFICATIONS. Reinstall electrical
connector on camshaft position sensor. When engine is started, rib
material at camshaft end of camshaft position sensor will be sheared
off and the air gap will be automatically set.
Installation (Original Or Used Camshaft Position Sensor)
1) Camshaft position sensor installation depth must be
adjusted to prevent camshaft position sensor from contacting the
camshaft sprocket. Inspect camshaft end of camshaft position sensor to
see if any of the original rib material is still present. See Fig. 16.
The rib material was used to position the camshaft position sensor at
the correct installation depth when the sensor was originally
installed.
CAUTION: DO NOT remove more rib material than necessary or camshaft
position sensor may be damaged. Due to high magnetic field
and possible electrical damage to camshaft position sensor,
DO NOT use electric grinder to remove rib material from
camshaft position sensor.
2) If no rib material exists, go to next step. If any rib
material exists, using razor knife, remove rib material from camshaft
end of camshaft position sensor until rib material is even with end of
camshaft position sensor.
CAUTION: DO NOT fabricate a paper spacer for camshaft end of camshaft
position sensor. Paper spacer from parts department is a
specified thickness for obtaining the correct camshaft
position sensor installation depth.
3) Ensure camshaft end of camshaft position sensor is clean.
Install NEW paper spacer from parts department on camshaft end of
camshaft position sensor. Use only specified paper spacer from parts
department for this camshaft position sensor application.
4) Apply light coat of engine oil on camshaft position sensor
"O" ring. Using a 1/2" wide metal ruler, measure distance from the
surface at camshaft position sensor mounting hole opening on timing
chain cover to the camshaft sprocket. See Fig. 15.
5) If distance is about 1.818" (46.18 mm), go to step 6). I\
f
distance is about 2.018" (51.26 mm), rotate engine by using crankshaft\
vibration damper retaining bolt until distance from the surface at
camshaft position sensor mounting hole opening on timing chain cover
to the camshaft sprocket is about 1.818" (46.18 mm). This will put the\

high machined area on camshaft sprocket toward the camshaft position
sensor. Go to next step.
CAUTION: Ensure proper measurement is obtained before installing
camshaft position sensor. DO NOT install camshaft position
sensor with low machined area on camshaft sprocket aligned
with camshaft position sensor mounting hole opening on timing
chain cover, or camshaft shaft position sensor will be
damaged when engine is started.
6) Using a slight rocking action, lightly push camshaft
position sensor into timing chain cover until paper spacer contacts
camshaft sprocket. DO NOT twist camshaft position sensor during
installation or "O" and paper spacer ring may be damaged. DO NOT
install camshaft position sensor retaining bolt at this time.
7) Using a scribe, place a scribe line on timing chain cover
at the end of slotted mounting hole on camshaft position sensor. See
Fig. 17 . This scribe line will be used as a reference when
reinstalling camshaft position sensor to obtain the correct camshaft
position sensor installation depth.
8) Remove camshaft position sensor from timing chain cover.
Remove paper spacer from camshaft end of camshaft position sensor.
Apply light coat of engine oil on camshaft position sensor "O" ring.
CAUTION: Camshaft position sensor must be positioned so end of slotted
mounting hole on camshaft position sensor aligns with scribe
line to provide proper camshaft position sensor installation
depth.
9) Using a slight rocking action, lightly push camshaft
position sensor into timing chain cover until end of slotted mounting
hole on camshaft position sensor aligns with scribe line on timing
chain cover. DO NOT twist camshaft position sensor during
installation, or "O" ring may be damaged.
10) Install and tighten camshaft position sensor retaining
bolt to specification. See TORQUE SPECIFICATIONS. Reinstall electrical
connector on camshaft position sensor.
Fig. 15: Locating Machined Areas On Camshaft Position Sensor &
Measuring Distance Between Camshaft Sprocket & Sensor Mounting Surface
(Ram Pickup 8.0L)
Courtesy of Chrysler Corp.