BENDIX M-21-M-22 ANTILOCK MOD ASSY Przewodnik Instalacji Pobierz pdf (Strona 31)

MBS-2 Installation

ABS System Diagnostics

Initial System Checkout

When the system is first powered up the ABS malfunction lamp will come ON

for two seconds then go OFF, indicating the system has passed all self-tests.

All MBS-2 units and optional features must pass operation checks before the

trailer is placed in service.

Pneumatic Diagnostics

The Wabash ABS system does not monitor the air system of the vehicle. For

example, if there is an air leak, kink in the line, or faulty relay valve, the ABS

malfunction lamp will not show a fault in the system. However, if a malfunction

in the air system arises and it cannot be determined if the ABS valve is

causing the problem, the ABS can simply be bypassed using a short length of

airline and two push-in unions. For example, if an unknown kink exists in the

control line and the brakes will not apply, simply remove the airlines from the

quick connect fittings on the ABS valve and insert the short length of airline

using the push-in unions. The system can then be reexamined without the

ABS affecting the system. If the brakes still do not apply it can then be

assumed that the ABS valve is not causing the problem.

Electrical Diagnostics

The malfunction lamp is an important tool when assessing the status of the

ABS system. When the system is operating properly the malfunction lamp will

illuminate briefly, then go OFF every time the system is powered up. If the

vehicle is stationary at power up, the lamp will remain ON for two seconds and

the PCM will perform a functional test causing an audible clicking or puffing. If

the vehicle is mobile at power up, the lamp will remain ON for one second and

the PCM self-test will be aborted. The PCM self-test is performed at each

stationary power up to give the operator an audible sign that everything is

performing normally.

The ABS system receives power from the stop lamp circuit (pin 4 of J560

connector – red) and the auxiliary circuit (pin 7 of J560 connector – blue). This

means the system will operate on a tractor with or without the auxiliary circuit

powered at tractor ignition. In a situation where the system only receives

power from the stop circuit, the malfunction lamp will illuminate briefly each

time the brakes are applied and the PCM self test will be performed at each

stationary brake application.

Upon power up, if the system behaves differently than described above, such

as the malfunction lamp remains illuminated or does not come ON at all, follow

the instructions in the next section to determine the cause of the problem.

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BENDIX M-21-M-22 ANTILOCK MOD ASSY Przewodnik Instalacji Strona 31