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Section 3
ABS Questions and Answers
Can you continue to operate a vehicle when the
warning lamp indicates a fault?
Yes. When a fault exists in the ABS, standard
braking returns to the affected wheel, and the ABS
still controls other monitored wheels. This lets you
complete the trip. You should not ignore the
warning lamp and should have the vehicle
serviced as soon as possible after the lamp
comes ON and stays ON.
Types of Faults
What is a “fault” in the system?
A fault in the system is a problem that can exist in
the ABS or in the system’s components. Faults
can be either existing faults or intermittent
stored faults.
What is an existing fault?
An existing fault is a problem that exists currently
in the system. For example, a damaged sensor
cable is an existing fault that the ECU will detect
and store into memory until you identify the cause,
repair the cable and clear the fault from the ECU.
What is an intermittent fault?
An intermittent fault is a problem that usually
occurs only under certain driving conditions. For
example, the ECU may detect a loose cable or wire
or receive an erratic signal from a wheel sensor.
Since intermittent faults can be unpredictable and
may only happen periodically, you can use
information stored in ECU memory to find and
correct the loose cable or wire.
Is an intermittent fault difficult to locate
and repair?
It can be, because you may not be able to easily
see the cause of the problem. WABCO
recommends that you write down intermittent
faults to help you isolate a fault that recurs over a
period of time.
Can the ECU store more than one fault
in memory?
Yes. And the ECU retains existing and intermittent
faults in memory even when you turn OFF the
power to the ECU.
For part number information, refer to PB-96133.
Copies are available from the WABCO North
America Customer Care at 855-228-3203.
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