BENDIX M-21-M-22 ANTILOCK MOD ASSY Guida di Installazione Scaricare il pdf (Pagina 46)

MBS-2 Installation

Unlike a regular fault, on the next stationary power up after the fault is

repaired, the lamp will remain ON because the fault trace is still present. Once

the trailer moves, and assuming both signals are now present, the malfunction

lamp will go out and ABS function will be available. However, a trace of the

fault still remains, even though the fault no longer exists as a current fault. If

the trailer immediately stops and goes through a power OFF/ON cycle, the

malfunction lamp will again remain illuminated until the trailer starts to move.

The ECM still is not satisfied that the sensor signal fault is absolutely gone,

taking about two minutes of normal driving above 5 mph before the trace of

the fault is completely cleared with a restored signal. After the next power

OFF/ON cycle, the malfunction lamp behaves as normal, illuminating for two

seconds, then turning OFF. The fault trace is gone and will be replaced by a

stored fault in memory.

The fault trace can also be cleared in the shop by either of two methods:

• Jack up and spin only the wheel that had the faulty signal. The

malfunction lamp will go OFF immediately and return to normal behavior.

This approach does not clear the stored sensor signal fault. It is still

available as a record, just like any other stored fault.

NOTE: All other wheels must remain stationary while spinning the wheel

that introduced the fault.

• The second method of clearing the fault trace in the shop is to restore the

sensor signal, then clear the signal fault. The fault trace will also be

cleared. Proceed as usual to clear any stored fault.

The trace fault management philosophy provides an excellent compromise. It

assures there is a fault indication on the next power up after sensor signal fault

detection. After the signal has been restored, normal malfunction lamp

behavior resumes within about two minutes of normal driving.

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BENDIX M-21-M-22 ANTILOCK MOD ASSY Guida di Installazione Pagina 46