3 Diagnostics, Troubleshooting and Testing
29
WABCO Maintenance Manual MM-0112 (Revised 07-18)
Active Braking Valves (ABV) Testing
Electrical Checks
앫 Check ABV 3/2 solenoid by itself for resistance.
앫 Check ECU harness and ABV 3/2 solenoid together for
resistance. Figure 3.23 and Figure 3.24.
앫 Verify no change in resistance or open circuit between ABV by
itself and through harness.
앫 Check harness by itself for any shorts to battery and shorts to
ground.
앫 Measurements should read as follows:
Figure 3.23
Location Measurement
ABV Supply to ABV Common 7.0-14.0 ohm for 12V system
26.3-49.0 ohm for 24V system
At ECU harness pins with ABV
connected
Same as above, no more than 1
ohm difference
ECU harness by itself for battery
voltage or ground
No continuity
Figure 3.23
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X3
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X1X4
4007207a
CAB MOUNT ECU’S:
LOOKING INTO WIRE HARNESS CONNECTOR
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