1991 1999 ford explorer chilton User Manual

4-WHEEL ANTI-LOCK BRAKE SYSTEM (4WABS)
Introduction
This system is used on the Mountaineer and 1993-99 Explorer, it was optional on all 1995-99 4-wheel drive
Ranger models.
The 4WABS system consists of the following components: The anti-lock Hydraulic Control Unit (HCU)-mounted to a bracket which is bolted to the left-hand
inner fender.
1. 
The Explorer/Mountaineer 4WABS module-located on the outboard side of the left-hand inner
fender, behind the plastic fender liner.
2. 
The Ranger 4WABS...

4-Wheel Anti-lock Brake System (4WABS) diagnostic trouble code chart
Click to enlarge
Hydraulic Control Unit (HCU)
PUMP TESTING Disconnect the HCU pump motor electrical plug.
1. 
Connect a Digital Volt/Ohm Meter (DVOM) across the two pump terminals and record the reading.
2. 
The reading should be between 52-68 Ohms
3. 
If not, replace the pump motor.
4.  HOW TO USE THIS BOOK
1064 System Self-Test 

REMOVAL & INSTALLATION
Front end of the 4-wheel ABS systemClick to enlarge
Disconnect the battery ground cable.
1. 
Unplug the 8-pin connector from the unit, and the 4-pin connector from the pump motor.
2. 
Disconnect the 5 inlet and outlet tubes from the unit. Immediately plug the ports.
3. 
Remove the 3 unit attaching nuts and lift out the unit.
4. 
Installation is the reverse of removal. Torque the mounting nuts to 12-18 ft. lbs. and the tube fittings
to 10-18 ft. lbs.
5. 
After reconnecting the...

Installation is the reverse of removal. Torque the mounting screw to 5-6 ft. lbs. and the connector bolt
to 4-5 ft. lbs.
4. 
After reconnecting the battery, it may take 10 miles or more of driving for the Powertrain Control
Module to relearn its driveability codes.
Front Wheel Speed Sensor
TESTING Disconnect the speed sensor wire harness plug from the sensor or sensor pigtail.
1. 
Connect a Digital Volt/Ohm Meter (DVOM) across the two sensor terminals and record the reading.
2. 
The reading should be...

Rear wheel speed sensor-4-wheel ABS
Click to enlarge
Disconnect the wiring from the harness.
1. 
Remove the sensor hold-down bolt and remove the sensor from the axle.
2. 
To install: Thoroughly clean the mounting surfaces. Make sure no dirt falls into the axle. Clean the magnetized
sensor pole piece. Metal particles can cause sensor problems. Replace the O-ring.
3. 
Coat the new O-ring with clean engine oil.
4. 
Position the new sensor on the axle. It should slide into place easily. Correct installation...

REMOVAL & INSTALLATION
Front wheel sensor ring-4-wheel ABSClick to enlarge
Raise and support the front end on jackstands.
1. 
Remove the wheels.
2. 
Remove the caliper, rotor and hub.
3. 
Using a 3-jawed puller, remove the ring from the hub. The ring cannot be reused; it must be replaced.
4. 
To install: Support the hub in a press so that the lug studs do not rest on the work surface.
5. 
Position the newsensor ring on the hub. Using a cylindrical adapter 98mm ID X 106mm OD, press
the ring into place....

SPECIFICATION CHARTS
4-Wheel Anti-lock Brake System (4WABS) diagnostic trouble code chart Click to enlarge
Chilton® Automotive Information Systems. © 2004 Thomson Delmar Learning.
SPECIFICATION CHARTS 1069 

EXTERIOR
Doors
REMOVAL & INSTALLATION
Exploded view of the Ranger front door hinge assemblyClick to enlarge
EXTERIOR 1071 

Exploded view of the Explorer/Mountaineer front door hinge assembly
Click to enlarge
HOW TO USE THIS BOOK
1072 REMOVAL & INSTALLATION 

Exploded view of the Explorer/Mountaineer rear door hinge assembly
Click to enlarge
If replacing the door with a stripped unit, remove all usable components from the old door.
1. 
If removing the rear door (Explorer), remove the scuff plate and center panel trim panel. Remove the
upper and lower hinge access cover plate if equipped, and matchmark the hinge-to-body and
hinge-to-door location. Support the door either on jackstands or have somebody hold it for you.
2. 
Remove the lower hinge-to-door bolts....