Technical information

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30
Technician Guidelines for Antilock Braking Systems
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9. Modulator Valve Removal and Installation
The following removal and installation information is
offered as a guideline only. Always refer to the manufacturer’s
specific instructions when removing or installing ABS
modulator valves.
Removal
1.Disconnect the harness connector from the modulator
valve. Be careful not to criss-cross wiring.
2.Disconnect the air supply and air delivery lines from
their respective ports.
3. Remove modulator valve mounting fasteners.
4.Remove the modulator valve.
Installation
1.Install the modulator valve with appropriate mounting
fasteners. Tighten to specified torque.
2.Connect the air supply and air delivery lines at their
respective ports.
3.Connect the harness connector to the modulator
valve. Be careful not to criss-cross wiring.
4.Check installation by applying the brakes, listening for
leaks at the modulator valve.
5.Turn the ignition on, and listen for the modulator
valve to cycle. If the valve fails to cycle, check the
electrical connection and any stored or active fault
codes. Drive the vehicle to verify that the ABS and its
malfunction lamp operate properly.
10. Proper ABS Modulator Valve Resistance
For most ABS modulator valves, the resistance range
between each valve solenoid coil terminal and the ground on
the ABS valve connector is between 3-10 ohms. To test this
resistance, disconnect the wiring connector from the modulator
and test the resistance between the two pins of each solenoid.
Follow the manufacturer’s instructions for determining valve
resistance.