Technical information

■
■
29
Technician Guidelines for Antilock Braking Systems
■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■
specification (See lubricant recommendation in
previous section “ Sensor Pickup Installation—Front
Axle”).
2.Clean and inspect the hole in the mounting block.
Install the sensor spring clip. Make sure the flange
stops on the inboard side of the vehicle.
3.Push the sensor spring clip into the mounting block
until it stops.
4.Push the pickup completely into the sensor spring clip
until it contacts the tooth wheel. See figure at left.
5.Insert the pickup cable through the hole in the spider
and axle housing flange. Route the cable to the frame
rail. Be sure to route the cable in a way that will
prevent pinching or chafing, and will allow sufficient
movement for suspension travel.
6.Connect the pickup cable to the chassis harness.
7. Install the fasteners that hold the pickup cable in place.
8.Install the brake drum on the wheel hub.
7. Proper ABS Sensor Resistance
For most common types of ABS sensors, the sensor circuit
resistance is between 700-3000 ohms. Resistance can be
measured at the sensor connection when it is removed from
the ECU, or right at the sensor when the extension cable is
removed. Follow the manufacturer’s specifications to
determine the correct sensor resistance.
8. Modulator Valve/Routine Inspection
As part of a routine vehicle preventive maintenance
program, ABS modulator valves should be checked for proper
operation and condition. This inspection generally should
include:
1.Removal of contaminates and a visual inspection for
excessive corrosion and physical damage.
2.Inspection of all air lines and wiring harnesses for
signs of wear or physical damage.
3.Testing for leakage and proper operation.
For specific modulator valve inspection and testing
procedures, consult the manufacturer’s service information.
Sensor Pickup Removal/
Installation: Rear Axle