sensor MERCEDES-BENZ SPRINTER 2005 Service User Guide

(2) Slide axle shaft into axle tube.
(3) Install axle shaft hub nuts and tighten to N´m
65 (48 ft. lbs.).
(4) Install wheels.
AXLE HUB BEARINGS/SEALS
REMOVAL
(1) Remove brake caliper with support.
(2) Remove axle shaft.
(3) Back-off parking brakes.
(4) Remove outer hub nut with Wrench 9290 (Fig.
19).
(5) Remove locking plate, inner hub nut and thrust
washer (Fig. 19).
(6) Pull hub off axle tube.
(7) Pry out ABS sensor and remove seal from hub
(Fig. 20).
(8) Remove hub bearings from hub (Fig. 21).
(9) Remove inner and outer bearing cups from hub
with a hammer and drift.
INSTALLATION
(1) Install hub bearing cups with Installer 9291
and a hammer.
(2) Clean and thoroughly grease bearings with
Multi-purpose grease.
(3) Install inner wheel bearing.
(4) Coat outer circumference ofnewseal with
Hylomar SQ 32 M sealant.CAUTION: Do not coat seals rubberized sealing sur-
faces with sealant.
(5) Install seal into hub with an appropriate
installer.
NOTE: Sealing ring should be flush with wheel hub
or max. 3mm (0.12 in.) deep.
(6) Coat contact surface of ABS sensor ring with
Hylomar SQ 32 M sealant.
Fig. 19 HUB NUTS
1 - NUTS
2 - LOCKING PLATE
3 - THRUST WASHER
Fig. 20 SENSOR RING & OIL SEAL
1 - ABS SENSOR RING
2 - SEAL
Fig. 21 AXLE HUB BEARINGS
1 - REAR BEARING
2 - HUB
3 - FRONT BEARING
4 - ROTOR
3 - 20 REAR AXLEVA
AXLE SHAFTS - DUAL REAR WHEELS (Continued)

(7) Drive ABS sensor ring ring in as far as the
stop with a plastic hammer.
(8) Install hub on axle tube.
(9) Install outer hub bearing (Fig. 22).
(10) Install thrust washer (Fig. 23).
(11) Install inner hub nut (Fig. 24).
(12) Tighten inner hub nut with Wrench 9290 to
300 N´m (221 ft. lbs.) while spinning the wheel hub
constantly. Turn back inner nut and then tighten
until it touches the thrust washer without play. Then
tighten 1/8 turn.
(13) Install locking plate (Fig. 25).(14) Install outer hub nut and tighten with
Wrench 9290 to 250 N´m (184 ft. lbs.).
(15) Install axle shaft.
(16) Install brake caliper and support.
(17) Adjust parking brakes.
Fig. 22 OUTER HUB BEARING
1 - HUB
2 - BEARING
Fig. 23 THRUST WASHER
1 - HUB
2 - WASHER
Fig. 24 INNER HUB NUT
1 - HUB
2 - NUT
Fig. 25 LOCKING PLATE
1 - HUB
2 - PLATE
VAREAR AXLE 3 - 21
AXLE HUB BEARINGS/SEALS (Continued)

BRAKES - ABS
TABLE OF CONTENTS
page page
BRAKES - ABS
SPECIFICATIONS - TORQUE CHART........29
ELECTRICAL
DESCRIPTION.........................29
OPERATION...........................29
FRONT WHEEL SPEED SENSOR
REMOVAL.............................30
INSTALLATION.........................30
REAR WHEEL SPEED SENSOR
REMOVAL.............................30INSTALLATION.........................31
TONE WHEEL
REMOVAL.............................31
INSTALLATION.........................31
HCU (HYDRAULIC CONTROL UNIT)
DESCRIPTION.........................31
REMOVAL.............................31
INSTALLATION.........................32
BRAKES - ABS
SPECIFICATIONS - TORQUE CHART
TORQUE SPECIFICATIONS
DESCRIPTION N´m Ft. Lbs. In. Lbs.
Brake Lines To Hydraulic
unit16 Ð 12
ELECTRICAL
DESCRIPTION
NOTE: Wheel speed sensor should be installed all
the way into the clamping bushings, the wheel
speed sensor will self adjust when the vehicle is
moved.
The ABS brake system uses 4 wheel speed sensors.
A sensor is mounted to each front hub/bearings in
the front. A rear sensor is mounted to each rear sup-
port plate.
OPERATION
The Wheel Speed Sensor consists of a magnet sur-
rounded by windings from a single strand of wire.
The sensor sends a small AC signal to the CAB. This
signal is generated by magnetic induction. The mag-
netic induction is created when a toothed sensor ring
(exciter ring or tone wheel) passes the stationary
magnetic WSS.When the ring gear is rotated, the exciter ring
passes the tip of the WSS. As the exciter ring tooth
approaches the tip of the WSS, the magnetic lines of
force expand, causing the magnetic field to cut across
the sensor's windings. This, in turn causes current to
flow through the WSS circuit (Fig. 1) in one direc-
tion. When the exciter ring tooth moves away from
the sensor tip, the magnetic lines of force collapse
cutting the winding in the opposite direction. This
causes the current to flow in the opposite direction.
Every time a tooth of the exciter ring passes the tip
of the WSS, an AC signal is generated. Each AC sig-
nal (positive to negative signal or sinewave) is inter-
preted by the CAB. It then compares the frequency of
the sinewave to a time value to calculate vehicle
speed. The CAB continues to monitor the frequency
to determine a deceleration rate that would indicate
a possible wheel-locking tendency.
The signal strength of any magnetic induction sen-
sor is directly affected by:
²Magnetic field strength; the stronger the mag-
netic field, the stronger the signal
VABRAKES - ABS 5 - 29

²Number of windings in the sensor; more wind-
ings provide a stronger signal
²Exciter ring speed; the faster the exciter ring/
tone wheel rotates, the stronger the signal will be
²Distance between the exciter ring teeth and
WSS; the closer the WSS is to the exciter ring/tone
wheel, the stronger the signal will be.
FRONT WHEEL SPEED
SENSOR
REMOVAL
(1) Raise and support the vehicle.
(2) Remove the front wheels.
(3) Pull the wheel speed sensor out of the front
wheel hub (Fig. 2).
(4)Only due this step if sensor replacement is
necessary.Cut through the wheel speed sensor
cable at an easily accessible point (Fig. 2)
INSTALLATION
(1) Connect separate wheel speed sensor cables
with shrink-fit sleeves and shrink-fit tubing (Fig.
2).Only due this step if replacing the sensor.
(2) Install the wheel speed sensor all the way into
the front wheel hub the wheel speed sensor will self
adjust when the vehicle is moved (Fig. 2).
(3) Install the front wheels.(4) Lower the vehicle.
REAR WHEEL SPEED SENSOR
REMOVAL
(1) Raise and support the vehicle.
(2) Remove the rear wheels.
(3) Pull the wheel speed sensor out of the mount-
ing hole in the axle supporting tube (Fig. 3).
(4)Only due this step if sensor replacement is
necessary.Cut through the wheel speed sensor
cable at an easily accessible point (Fig. 3)
Fig. 1 Operation of the Wheel Speed Sensor
1 - MAGNETIC CORE
2 - CAB
3 - AIR GAP
4 - EXCITER RING
5 - COIL
Fig. 2 FRONT WHEEL SPEED SENSOR
1 - SHRINK-FIT SLEEVE
2 - CLAMPING BUSHING
3 - SPEED SENSOR
4 - SHRINK TUBE
Fig. 3 REAR WHEEL SPEED SENSORS
1 - SHRINK-FIT SLEEVE
2 - SPEED SENSOR
3 - CLAMPING BUSHING
4 - SHRINK TUBE
5 - 30 BRAKES - ABSVA
ELECTRICAL (Continued)

INSTALLATION
(1) Connect separate wheel speed sensor cables
with shrink-fit sleeves and shrink-fit tubing (Fig.
3).Only due this step if replacing the sensor.
(2) Install the wheel speed sensor all the way into
the axle tube, the wheel speed sensor will self adjust
when the vehicle is moved (Fig. 3).
(3) Install the rear wheels.
(4) Lower the vehicle.
TONE WHEEL
REMOVAL
(1) Remove the hub/bearing assembly (DRW)
(Refer to 3 - DIFFERENTIAL & DRIVELINE/REAR
AXLE/AXLE BEARINGS - REMOVAL).
(2) Insert a hooked prybar between the hub/bear-
ing and the inside of the tone wheel and pry upwards
slightly and work your way around the tone wheel
until the wheel is loose (Fig. 4).
(3) Remove the tone wheel.
INSTALLATION
(1) Install the tone wheel to the hub/bearing with
a thin bead of silicone around the tone wheel.
(2) Tap the tone wheel down with a soft hammer
until seated.
(3) Install the hub/bearing (DRW) (Refer to 3 -
DIFFERENTIAL & DRIVELINE/REAR AXLE/AXLE
BEARINGS - INSTALLATION).
HCU (HYDRAULIC CONTROL
UNIT)
DESCRIPTION
The HCU consists of a valve body, pump motor, low
pressure accumulators, inlet valves, outlet valves and
noise attenuators.
REMOVAL
NOTE: Store the Hydraulic Control Unit in an
upright position only.
(1) Disconnect the ground cable at the battery.
The ignition switch must be switched to the off
position when disconnecting the battery cable.
(2) Disconnect the multiplug from the control mod-
ule (Fig. 5).
(3) Disconnect the brake lines from the hydraulic
control unit (Fig. 5).Mark the brake lines for
reinstallation, also seal off the connections and
lines to prevent contamination.
(4) Remove the hydraulic control unit from the
bracket (Fig. 5).
(5) Check the rubber mounts on the bracket.
(Replace if necessary) (Fig. 5).
Fig. 4 TONE WHEEL REMOVAL
1 - HOOKED PRYBAR
2 - TONE WHEEL
3 - HUB/BEARING ASSEMBLY
Fig. 5 HYDRAULIC CONTROL UNIT (ABS)
1 - BRAKE LINES
2 - HCU WITH CONTROL MODULE
3 - ABS/ABD CONTROL MODULE MULTIPLUG
4 - RUBBER SUPPORT
VABRAKES - ABS 5 - 31
REAR WHEEL SPEED SENSOR (Continued)

CONDITION POSSIBLE CAUSES CORRECTION
13. Brakes dragging. 13. Check brakes. (Refer to 5 -
BRAKES/HYDRAULIC/
MECHANICAL - DIAGNOSIS AND
TESTING)
TEMPERATURE GAUGE READING
INCONSISTENT ( ERRATIC,
CYCLES OR FLUCTUATES)1. Heavy duty cooling system,
extream cold ambient (outside)
temperature or heater blower motor
in high position.1. None. System operating normaly.
2. Temperature gauge or gauge
sensor defective.2. Check gauge. (Refer to 8 -
ELECTRICAL/INSTRUMENT
CLUSTER - DIAGNOSIS AND
TESTING)
3. Temporary heavy usage or load. 3. None. Normal condition.
4. Air traped in cooling system. 4. Fill cooling system (Refer to 7 -
COOLING - STANDARD
PROCEDURE).
5. Water pump 5. Replace water pump.
6. Air leak on suction side of water
pump.6. Check for leak. (Refer to 7 -
COOLING - DIAGNOSIS AND
TESTING)
RADIATOR CAP LEAKING STEAM
AND /OR COOLANT INTO
RESERVOIR BOTTLE.
(TEMPERATURE GAUGE MAY
READ HIGH)1. Radiator cap defective. 1. Replace radiator cap.
2. Radiator neck surface damaged. 2. Replace radiator.
HOSE OR HOSES COLLAPSE
WHEN ENGINE IS COOLING.1. Vacuum created in cooling
system on engine cool-down is not
being relieved through coolant
reservior/overflow system.1. Replace radiator cap, check vent
hose between radiator and reservoir
bottle for blockage also check
reservoir bottle vent for blockage.
NOISY FAN 1. Fan blade(s) loose, damaged. 1. Replace fan blade assembly.
2. Thermal viscous fan drive. 2. None. Normal condition.
3. Fan blades striking surrounding
objects.3. Locate contact point and repair
as necessary.
4. Thermal viscous fan drive
bearing.4. Replace viscous fan drive
assembly.
5. Obstructed air flow through
radiator.5. Remove obstruction.
INADEQUATE AIR CONDITIONER
PERFORMANCE (COOLING
SYSTEM SUSPECTED)1. Radiator and/or A/C condenser
air flow obstructed.1. Remove obstruction and/or clean.
VACOOLING 7 - 3
COOLING (Continued)

ENGINE
TABLE OF CONTENTS
page page
COOLANT
DESCRIPTION..........................9
DIAGNOSIS AND TESTING - COOLING
SYSTEM LEAKS......................10
STANDARD PROCEDURE
STANDARD PROCEDURE - ADDING
ADDITIONAL COOLANT.................11
STANDARD PROCEDURE - DRAINING
COOLING SYSTEM....................12
STANDARD PROCEDURE - REFILLING
COOLING SYSTEM....................12
COOLANT LEVEL SENSOR
REMOVAL.............................13
INSTALLATION.........................13
RADIATOR FAN
REMOVAL.............................13
INSTALLATION.........................13
ENGINE BLOCK HEATER
REMOVAL.............................14
INSTALLATION.........................14
ENGINE COOLANT TEMP SENSOR
DESCRIPTION.........................14REMOVAL.............................14
INSTALLATION.........................15
ENGINE COOLANT THERMOSTAT
REMOVAL.............................15
INSTALLATION.........................16
FAN DRIVE VISCOUS CLUTCH
REMOVAL.............................16
INSTALLATION.........................16
RADIATOR
REMOVAL.............................16
INSTALLATION.........................17
RADIATOR PRESSURE CAP
DESCRIPTION.........................18
OPERATION...........................18
DIAGNOSIS AND TESTING - RADIATOR
PRESSURE CAP......................19
WATER PUMP
REMOVAL.............................19
INSTALLATION.........................20
COOLANT
DESCRIPTION
Coolant flows through the engine water jackets and
cylinder heads absorbing heat produced by the engine
during operation. The coolant carries heat to the radia-
tor and heater core. Here it is transferred to ambient
air passing through the radiator and heater core fins.
The required ethylene-glycol (antifreeze) and water
mixture depends upon the climate and vehicle oper-
ating conditions. The recommended mixture of 50/50
ethylene-glycol and water will provide protection
against freezing to -37 deg. C (-35 deg. F). The anti-
freeze concentrationmust alwaysbe a minimum of
44 percent, year-round in all climates.If percentage
is lower than 44 percent, engine parts may be
eroded by cavitation, and cooling system com-
ponents may be severely damaged by corrosion.
Maximum protection against freezing is provided
with a 68 percent antifreeze concentration, which
prevents freezing down to -67.7 deg. C (-90 deg. F). A
higher percentage will freeze at a warmer tempera-
ture. Also, a higher percentage of antifreeze can
cause the engine to overheat because the specific
heat of antifreeze is lower than that of water.100 Percent Ethylene-GlycolÐShould Not Be Used in
Chrysler Vehicles
Use of 100 percent ethylene-glycol will cause forma-
tion of additive deposits in the system, as the corrosion
inhibitive additives in ethylene-glycol require the pres-
ence of water to dissolve. The deposits act as insulation,
causing temperatures to rise to as high as 149 deg. C
(300 deg. F). This temperature is hot enough to melt
plastic and soften solder. The increased temperature can
result in engine detonation. In addition, 100 percent
ethylene-glycol freezes at -22 deg. C (-8 deg. F ).
Propylene-glycol FormulationsÐShould Not Be Used in
Chrysler Vehicles
Propylene-glycol formulations do not meet
Chrysler coolant specifications.
It's overall effec-
tive temperature range is smaller than that of ethylene-
glycol. The freeze point of 50/50 propylene-glycol and
water is -32 deg. C (-26 deg. F). 5 deg. C higher than
ethylene-glycol's freeze point. The boiling point (protec-
tion against summer boil-over) of propylene-glycol is 125
deg. C (257 deg.F)at96.5 kPa (14 psi), compared to
128 deg. C (263 deg. F) for ethylene-glycol. Use of pro-
pylene-glycol can result in boil-over or freeze-up in
Chrysler vehicles, which are designed for ethylene-gly-
col. Propylene glycol also has poorer heat transfer char-
VAENGINE 7 - 9

COOLANT LEVEL SENSOR
REMOVAL
WARNING: RISK OF INJURY TO SKIN AND EYES
DUE TO SCALDING FROM HOT COOLANT. DO NOT
OPEN THE COOLING SYSTEM UNLESS THE TEM-
PERATURE IS BELOW 194ÉF (90ÉC). WEAR PRO-
TECTIVE CLOTHING AND EYE WEAR. RISK OF
POISONING IF COOLANT IS SWALLOWED. STORE
COOLANT IN PROPER AND APPROPRIATELY
MARKED CONTAINERS.
NOTE: Drain coolant from radiator drain plug only.
(1) Drain coolant until the coolant reservoir is
emptied.
(2) Disconnect the wiring harness electrical con-
nector.
(3) Turn the level sensor 90 degrees clockwises, lift
up and out of the container.
INSTALLATION
(1) Align coolant level sensor with coolant
reservior access whole, press down while turning
counterclockwise 90 degrees to seat sensor (Fig. 4).
(2) Connect coolant level sensor electrical connec-
tor (Fig. 4).
(3) Refill cooling system to proper level.
(4) Inspect for leaks.
RADIATOR FAN
REMOVAL
(1) Disconnect the negative battery cable.
(2) Remove the front end cross member.
(3) Push complete radiator assembly forward and
unclip the fan shroud at the radiator.
(4) Detach coolant line from lower radiator shroud.
(5) Retain accessory drive belt pulley of water
pump with a counterholder (Fig. 5).
(6) Unscrew the central bolt of the viscous fan
clutch and lift fan and shroud up and out (Fig. 5).
NOTE: Store the viscous fan clutch in the upright
position. DO NOT place down flat.
(7) Remove radiator fan from viscous fan clutch
(Fig. 5).
INSTALLATION
(1) Install fan blade to viscous clutch. Tighten
bolts to 80 lbs. in. (9 N´m) (Fig. 5).
(2) Install fan and clutch along with fan shroud in
to engine bay area (Fig. 5).
(3) Install the center bolt of the viscous clutch.
Tighten bolt to 33 lbs. ft. (45 N´m) (Fig. 5)
(4) Attach coolant line to lower radiator shroud.
(5)
Properly align and clip the fan shroud into place.
Fig. 4 COOLANT LEVEL SENSOR
1 - COOLANT LEVEL SENSOR
2 - COOLANT RESERVIOR
3 - ELECTRICAL CONNECTOR
Fig. 5 RADIATOR FAN
1 - VISCOUS CLUTCH
2 - COUNTERHOLDER
3 - CLUTCH BOLT
4 - FAN BOLT
5-FAN
VAENGINE 7 - 13

(6) Properly align the radiator assembly and
install the front end cross member.
(7) Connect negative battery cable.
ENGINE BLOCK HEATER
REMOVAL
WARNING: RISK OF INJURY TO SKIN AND EYES
DUE TO SCALDING FROM HOT COOLANT. DO NOT
OPEN THE COOLING SYSTEM UNLESS THE TEM-
PERATURE IS BELOW 194ÉF (90ÉC). WEAR PRO-
TECTIVE CLOTHING AND EYE WEAR. RISK OF
POISONING IF COOLANT IS SWALLOWED. STORE
COOLANT IN PROPER AND APPROPRIATELY
MARKED CONTAINERS.
(1) Disconnect the negative battery cable.
(2) Drain the cooling system.
(3) Record the location and snip the wire ties.
(4) Unscrew the engine block heater from the core
plug hole and remove (Fig. 6).
INSTALLATION
(1) Screw the block heater into the appropriate
core hole (Fig. 6).
(2) Route the heater wiring harness away from
and interference and secure with wiring tie straps.
(3) Refill the cooling system.
(4) Connect the negative battery cable.
(5) Start the engine and inspect for leaks.
ENGINE COOLANT TEMP
SENSOR
DESCRIPTION
The ECM determines the operating temperature of
the engine by using the signal from the coolant tem-
perature sensor. The coolant temperature sensor has
a negative temperature coefficient (NTC) resistor
contained in the plastic housing. NTC means; the
higher the temperature, then the lower the resis-
tance. The ECM also uses the coolant temperature
sensor signal to calculate glow plug relay triggering.
If the coolant temperature sensor fails during opera-
tion, the ECM will switch on the cooling fan to pre-
vent engine overheating (A/C models only).
REMOVAL
WARNING: RISK OF INJURY TO SKIN AND EYES
FROM SCALDING WITH HOT COOLANT. RISK OF
POISONING FROM SWALLOWING COOLANT. DO
NOT OPEN COOLING SYSTEM UNLESS COOLANT
TEMPERATURE IS BELOW 90ÉC. OPEN CAP
SLOWLY TO RELEASE PRESSURE. STORE COOL-
ANT IN SUITABLE AND APPROPRIATELY MARKED
CONTAINER. WEAR PROTECTIVE GLOVES,
CLOTHES AND EYE WEAR.
(1) Disconnect negative battery cable.
(2) Remove engine cover (Refer to 9 - ENGINE -
REMOVAL).
(3) Partailly drain coolant system (Refer to 7 -
COOLING/ENGINE/COOLANT - STANDARD PRO-
CEDURE).
(4) Unplug coolant temperature sensor electrical
connector.
Fig. 6 ENGINE BLOCK HEATER
1 - ENGINE BLOCK HEATER
2 - CORE PLUG
3 - ENGINE MOUNT
4 - WIRING TIE STRAPS
7 - 14 ENGINEVA
RADIATOR FAN (Continued)

NOTE: Capture any residual coolant that may flow.
(5) Remove coolant temperature sensor (Fig. 7).
INSTALLATION
WARNING: RISK OF INJURY TO SKIN AND EYES
FROM SCALDING WITH HOT COOLANT. RISK OF
POISONING FROM SWALLOWING COOLANT. DO
NOT OPEN COOLING SYSTEM UNLESS COOLANT
TEMPERATURE IS BELOW 90ÉC (194ÉF). OPEN CAP
SLOWLY TO RELEASE PRESSURE. STORE COOL-
ANT IN SUITABLE AND APPROPRIATELY MARKED
CONTAINER. WEAR PROTECTIVE GLOVES,
CLOTHES AND EYE WEAR.
(1) Position and install coolant temperature sensor
(Fig. 7).
(2) Connect coolant temperature sensor electrical
connector (Fig. 7).
(3) Refill coolant system to proper level with
proper mixture of coolant (Refer to 7 - COOLING/
ENGINE/COOLANT - STANDARD PROCEDURE).(4) Install engine cover (Refer to 9 - ENGINE -
INSTALLATION).
(5) Connect negative battery cable.
WARNING: USE EXTREME CAUTION WHEN ENGINE
IS OPERATING. DO NOT STAND IN A DIRECT LINE
WITH FAN. DO NOT PUT YOUR HANDS NEAR PUL-
LEYS, BELTS OR FAN. DO NOT WEAR LOOSE
CLOTHES.
(6) Start engine and inspect for leaks.
ENGINE COOLANT
THERMOSTAT
REMOVAL
WARNING: RISK OF INJURY TO SKIN AND EYES
FROM SCALDING WITH HOT COOLANT. RISK OF
POISONING FROM SWALLOWING COOLANT. DO
NOT OPEN COOLING SYSTEM UNLESS COOLANT
TEMPERATURE IS BELOW 90ÉC (194ÉF). OPEN CAP
SLOWLY TO RELEASE PRESSURE. STORE COOL-
ANT IN SUITABLE AND APPROPRIATELY MARKED
CONTAINER. WEAR PROTECTIVE GLOVES,
CLOTHES AND EYE WEAR.
NOTE: Inspect condition of all clamps and hoses,
replace as necessary.
(1) Disconnect negative battery cable.
(2) Drain engine coolant (Refer to 7 - COOLING/
ENGINE/COOLANT - STANDARD PROCEDURE).
(3) Unplug connector, pull off locking element and
pull out coolant temperature sensor.
(4) Detach air intake hose at charge air distribu-
tion pipe.
(5) Detach coolant hoses at thermostat housing.
(6) Remove bracket for fuel line.
(7) Unscrew cap at oil filter housing.
(8) Remove thermostat housing (Fig. 8).
(9) Clean all sealing surfaces.
Fig. 7 ENGINE COOLANT TEMPERATURE SENSOR
1 - RETAINING CLAMP
2 - ENGINE COOLANT TEMPERATURE SENSOR
VAENGINE 7 - 15
ENGINE COOLANT TEMP SENSOR (Continued)