B3000 SE Regular Cab 4WD V6-3.0L OHV (1998)
Electronic Brake Control Module: Description and Operation
(4WABS)
The anti-lock brake control module is mounted to the ABS hydraulic control unit.
It is an on-board diagnostic, non-repairable unit consisting of two microprocessors and the necessary circuitry for their operation. The anti-lock brake
control module monitors system operation during normal driving as well as during anti-lock braking.
Anti-lock brake module operation is as follows:
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Under normal driving conditions, the microprocessor produces short test pulses to the solenoid valves that check the electrical system without any
mechanical reaction.
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Impending wheel lock conditions trigger signals from the anti-lock brake control module that open and close the appropriate solenoid valves. This
results in moderate pulsations in the brake pedal.
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During normal braking, the brake pedal feel will be identical to a standard brake system.
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Most faults which occur to the anti-lock brake system will be stored as a Diagnostic Trouble Code (DTC) in the keep-alive memory of the
anti-lock brake control module. The DTCs can be retrieved by following the on-board diagnostic procedures.
