
12
Sensor Tests
There are two possible sensor tests which can be run
to test the wheel speed sensor output.
The S-X Sensor test will test both the wheel speed
sensor and applies the brake for that particular wheel
on a vehicle.
Bendix recommends that this sensor test be run as it
tests the complete wheel end including the sensor and
modulator.
Figure 36
Simple Sensor Test
Basically displays the sensor output in MPH.
Figure 37
Pressure Sensor Test
The pressure sensor test reads the pressures applied
to the ECU through the brake system.
The number of pressure sensors supported is
dependent upon the ECU.
Figure 38
P21 / P22 Delivery Test
The P21/P22 delivery test will check that the module is
plumbed to the correct chambers and that brake delivery
pressure is being delivered. The delivery pressure
should match the control pressure. The technician will
apply the brakes and verify that the delivery and control
pressure should be the same. ACom
™
Diagnostics will
release the brakes and the technician needs to verify
the brakes have released, then ACom
™
Diagnostics will
re-apply the brakes.
Figure 39
AUX I/O Test
The AUX I/O test will energize and de-energize the
AUX I/O. The technician can put a lamp in the auxiliary
circuit and visually verify if that the AUX is operating
correctly.
Figure 40
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