3 Diagnostics, Troubleshooting and Testing
32
WABCO Maintenance Manual MM-0112 (Revised 07-18)
NOTE: If you are using versions older than TOOLBOX™ Software
version 11, to test the function of the Trailer ABV, choose “Trailer
Brake Valve” or “E4.3 Trailer Brake Valve” from the “Component
Tests” drop-down menu. Listen to ensure the correct valve is
cycling. If you are unsure which test option to choose, please
contact WABCO North America at 855-228-3203 and have your
ECU part number available.
Brake Pressure Sensor Testing
Electrical Checks
For the following check, all of the ECU connectors must be plugged
in as the ECU provides voltage and ground to the BPS.
앫 Take measurements at the pressure sensor harness connector.
Figure 3.29.
앫 Measure Voltage Supply to Ground on Pin 1 of the BPS
Connector Key ON.
With ECU and BPS disconnected:
앫 Verify continuity end to end on all 3 lines.
앫 Verify no shorts to ground or battery on all 3 lines.
앫 Verify no continuity between pins.
Measurements should read as below.
Figure 3.29
Pressure Sensor Testing Available in WABCO
TOOLBOX™ Software
The pressure sensor test can be accessed through WABCO
TOOLBOX™ Software under Component Tests, Pressure Sensor.
앫 Ensure brake pedal position and pressure is displayed in the
corresponding boxes. Figure 3.30 and Figure 3.31.
Figure 3.30
Figure 3.31
Location Measurement
Voltage Supply to Ground 8.0-16.0V
Pressure Signal or Ground Line
short to battery or ground
No continuity
Figure 3.29
4007210a
1
3
2
PRESSURE SENSOR CONNECTOR
Pin Circuit
1 Voltage Supply
2 Ground
3 Pressure Signal
Figure 3.30
Figure 3.31
4010625a
4010626a
WABCO Toolbox – Pressure Sensor
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