1999 DODGE RAM Service Repair Manual

bracket. Ensure alignment tab on brake switch aligns with opening on
mounting bracket.
CAUTION: When adjusting brake switch, DO NOT pull brake pedal back
toward brake switch with excessive pressure, or brake switch
may be damaged.
3) When brake switch is fully installed in mounting bracket,
rotate brake switch clockwise approximately 30 degrees. To ensure
proper brake switch adjustment, gently pull brake pedal back toward
brake switch as far as possible. DO NOT apply excessive pressure on
brake pedal and brake switch.
Removal (Ram Van & Ram Wagon)
1) Brake switch is located near top of brake pedal. Remove
lower steering column cover. Remove data link connector, hood release
lever and parking brake lever from lower instrument panel cover.
2) Remove lower instrument panel cover for access to brake
switch. Depress and hold brake pedal downward. Rotate brake switch
counterclockwise approximately 1/16 turn to so locking collar on brake
switch aligns with opening on mounting bracket. Pull brake switch
rearward from mounting bracket. Disconnect electrical connector from
brake switch.
NOTE: Before installing brake switch, plunger on brake switch must
be pulled outward to fully extended position and then pushed
inward 4 detent positions to ensure proper brake switch
adjustment.
Installation
1) Pull plunger on brake switch outward to the fully extended
position. Push plunger on brake switch inward 4 detent positions. The
brake switch will click at each detent position when pushing plunger
inward.
2) Install electrical connector on brake switch. Depress
brake pedal as far as possible. Install brake switch in mounting
bracket. Ensure locking collar on brake switch aligns with opening on
mounting bracket.
CAUTION: When adjusting brake switch, DO NOT pull brake pedal back
toward brake switch with excessive pressure, or brake switch
may be damaged.
3) When brake switch is fully installed in mounting bracket,
rotate brake switch clockwise approximately 1/16 turn. To ensure
proper brake switch adjustment, gently pull brake pedal back toward
brake switch as far as possible. DO NOT apply excessive pressure on
brake pedal and brake switch.
CAMSHAFT POSITION SENSOR
Removal & Installation
See CAMSHAFT POSITION SENSOR under IGNITION SYSTEM.
CRANKSHAFT POSITION SENSOR
Removal & Installation
See CRANKSHAFT POSITION SENSOR under IGNITION SYSTEM.
DOWNSTREAM OXYGEN SENSOR
NOTE: Downstream oxygen sensor may also be referred to as post
-catalyst oxygen sensor.

Removal
Downstream oxygen sensor is mounted on exhaust pipe, behind
catalytic converter. Raise and support vehicle. Disconnect electrical
connector for downstream oxygen sensor. Using Socket (YA8875), remove
downstream oxygen sensor from exhaust pipe.
Installation
If installing original or used downstream oxygen sensor,
apply anti-seize compound on threads of downstream oxygen sensor. A
NEW downstream oxygen sensor should already be coated with anti-seize
compound. Install and tighten downstream oxygen sensor to
specification. See TORQUE SPECIFICATIONS. Install electrical
connector.
ENGINE COOLANT TEMPERATURE SENSOR
Removal & Installation (Dakota 2.5L)
1) Partially drain cooling system. Disconnect electrical
connector at engine coolant temperature sensor. Engine coolant
temperature sensor is located on side of thermostat housing and
contains a Tan/Black wire and a Black/Light Blue wire in the
electrical connector.
2) Remove engine coolant temperature sensor. To install,
reverse removal procedure. Tighten engine coolant temperature sensor
to specification. See TORQUE SPECIFICATIONS. Fill cooling system.
Removal (Dakota 3.9L, 5.2L & 5.9L, Durango & Ram Pickup 3.9L,
5.2L & 5.9L)
1) Partially drain cooling system. Engine coolant temperature
sensor is located on front of intake manifold, near inside of
generator and contains a Tan/Black wire and a Black/Light Blue wire in
the electrical connector.
2) Remove air cleaner if necessary for access to engine
coolant temperature sensor. On models equipped with A/C, go to next
step. On models not equipped with A/C, disconnect electrical connector
at engine coolant temperature sensor. Remove engine coolant
temperature sensor.
3) On A/C equipped models, electrical connector on engine
coolant temperature sensor may be difficult to reach. It may be
necessary to use a coat hanger and fabricate an "L" shaped tool about
8" (203 mm) long to disconnect electrical connector by placing hook
part of tool under electrical connector and pulling electrical
connector upward from engine coolant temperature sensor. Remove engine
coolant temperature sensor.
Installation
To install, reverse removal procedure. Tighten engine coolant
temperature sensor to specification. See TORQUE SPECIFICATIONS. Fill
cooling system.
Removal & Installation (Ram Pickup 8.0L)
1) Partially drain cooling system. Engine coolant temperature
sensor is located on front of intake manifold, near rear of generator
and contains a Tan/Black wire and a Black/Light Blue wire in the
electrical connector.
2) Disconnect electrical connector at engine coolant
temperature sensor. Remove engine coolant temperature sensor.
3) To install, reverse removal procedure. Tighten engine
coolant temperature sensor to specification. See TORQUE
SPECIFICATIONS. Fill cooling system.
Removal (Ram Van & Ram Wagon)

1) Partially drain cooling system. Engine coolant temperature
sensor is located on front of intake manifold, near inside of
generator and contains a Tan/Black wire and a Black/Light Blue wire in
the electrical connector.
2) On 3.9L, remove engine cover and air cleaner housing from
inside of vehicle for access to engine coolant temperature sensor. On
5.2L and 5.9L, engine coolant temperature sensor may be serviced from
front of vehicle without removing engine cover and air cleaner
housing.
3) On all models, disconnect electrical connector at engine
coolant temperature sensor. It may be necessary to use a coat hanger
and fabricate an "L" shaped tool about 8" (203 mm) long to disconnect
electrical connector by placing hook part of tool under electrical
connector and pulling electrical connector upward from engine coolant
temperature sensor. Remove engine coolant temperature sensor.
Installation
To install, reverse removal procedure. Tighten engine coolant
temperature sensor to specification. See TORQUE SPECIFICATIONS. Fill
cooling system.
FUEL LEVEL SENSOR
Removal & Installation
See FUEL LEVEL SENSOR under FUEL SYSTEM.
INTAKE AIR TEMPERATURE (IAT) SENSOR
NOTE: Intake air temperature sensor may also be referred to as
intake manifold air temperature sensor.
Removal & Installation (Dakota, Durango & Ram Pickup)
1) IAT sensor is screwed into the intake manifold. See Fig. 4
, 5 or 6. Remove air inlet duct or air cleaner assembly for access to
IAT sensor if necessary. Disconnect electrical connector at IAT
sensor. Remove IAT sensor from intake manifold.
2) To install, reverse removal procedure. Tighten IAT sensor
to specification. See TORQUE SPECIFICATIONS.
Removal & Installation (Ram Van & Ram Wagon)
1) IAT sensor is screwed into the intake manifold. See Fig. 5
. On 3.9L, remove engine cover and air cleaner housing from inside of
vehicle for access to IAT sensor. On 5.2L and 5.9L, IAT sensor may be
serviced from front of vehicle without removing engine cover and air
cleaner housing.
2) On all models, disconnect electrical connector at IAT
sensor. Remove IAT sensor from intake manifold. To install, reverse
removal procedure. Tighten IAT sensor to specification. See TORQUE
SPECIFICATIONS.
Fig. 4: Locating Intake Air Temperature (IAT) Sensor (Dakota 2.5L)
Courtesy of Chrysler Corp.

Fig. 5: Locating Intake Air Temperature (IAT) Sensor (Dakota 3.
9L, 5.2L & 5.9L, Durango, Ram Pickup 3.9L, 5.2L, & 5.9L, Ram Van & Ram
Wagon)
Courtesy of Chrysler Corp.
Fig. 6: Locating Intake Air Temperature (IAT) Sensor (Ram Pickup
8.0L)
Courtesy of Chrysler Corp.
MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR

Removal & Installation (Dakota, Durango & Ram Pickup 2.5L,
3.9L, 5.2L & 5.9L)
1) MAP sensor is located near throttle body and contains a 3-
pin electrical connector with an L-shaped rubber hose connecting it to
the throttle body. See Fig. 7 or 8. Remove air inlet duct or air
cleaner assembly for access to MAP sensor if necessary.
2) Ensure area around MAP sensor is clean. Disconnect
electrical connector at MAP sensor. Remove MAP sensor retaining bolts.
Remove MAP sensor while disconnecting L-shaped rubber hose from
throttle body. Remove L-shaped rubber hose from MAP sensor.
3) To install, reverse removal procedure. Ensure L-shaped
rubber hose is properly installed on throttle body and MAP sensor.
Tighten MAP sensor retaining bolts to specification. See TORQUE
SPECIFICATIONS.
Removal & Installation (Ram Pickup 8.0L)
1) MAP sensor is located on upper side of intake manifold and
contains a 3-pin electrical connector. See Fig. 9. Disconnect
electrical connector at MAP sensor.
2) Ensure area around MAP sensor is clean. Remove MAP sensor
retaining bolts. Remove MAP sensor with rubber seal gasket from intake
manifold. Rubber seal gasket is part of the MAP sensor and is not
serviceable. Inspect rubber seal gasket for damage. Replace MAP sensor
with rubber seal gasket if gasket is defective.
3) To install, reverse removal procedure. Ensure seal area in
upper intake manifold is clean before installing MAP sensor. Lubricate
rubber seal gasket with engine oil before installing MAP sensor.
Tighten MAP sensor retaining bolts to specification. See TORQUE
SPECIFICATIONS.
Removal & Installation (Ram Van & Ram Wagon)
1) MAP sensor is located near throttle body and contains a 3-
pin electrical connector with an L-shaped rubber hose connecting it to
the throttle body. See Fig. 8. Remove engine cover and air cleaner
assembly for access to MAP sensor if necessary.
2) Ensure area around MAP sensor is clean. Disconnect
electrical connector at MAP sensor. Remove MAP sensor retaining bolts.
Remove MAP sensor while disconnecting L-shaped rubber hose from
throttle body. Remove L-shaped rubber hose from MAP sensor.
3) To install, reverse removal procedure. Ensure L-shaped
rubber hose is properly installed on throttle body and MAP sensor.
Tighten MAP sensor retaining bolts to specification. See TORQUE
SPECIFICATIONS.
Fig. 7: Locating Manifold Absolute Pressure (MAP) Sensor (Dakota
2.5L)
Courtesy of Chrysler Corp.

Fig. 8: Locating Manifold Absolute Pressure (MAP) Sensor (Dakota
3.9L, 5.2L & 5.9L, Durango, Ram Pickup 3.9L, 5.2L & 5.9L, Ram Van &
Ram Wagon)
Courtesy of Chrysler Corp.
Fig. 9: Locating Manifold Absolute Pressure (MAP) Sensor (Ram
Pickup 8.0L)
Courtesy of Chrysler Corp.
OIL PRESSURE SENSOR

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