WABCO 400 500 320 0, Maintenance Manual, Page: 137 / 188

137
Sensor Adjustment and Component Testing
1. Apply constant power to the ECU/dual modulator valve assembly for more than one, but less than
fi ve seconds .
2. Remove power.
3. Reapply power.
4. Check the trailer ABS indicator lamp on the side of the trailer. The fault code will be displayed three
times.
5. Find the fault on the table and make the necessary repairs.
6. After making the necessary corrections, repeat the end of line test.
Blink Code Table
Blink Code Problem Area
Action
3 Sensor C
Determine sensor location.
Check sensor installation.
Perform necessary repairs.
4 Sensor D
Determine sensor location.
Check sensor installation.
Perform necessary repairs.
5 Sensor E
Determine sensor location.
Check sensor installation.
Perform necessary repairs.
6 Sensor F
Determine sensor location.
Check sensor installation.
Perform necessary repairs.
7 External ABS Modulator Valve
Verify correct electrical installation.
Check power supply.
Perform necessary repairs.
9 Internal ABS Modulator Valve
Verify correct installation. If code continues,
contact WABCO for assistance.
11 No Speed Failure Spin tires or drive the vehicle above 4 mph.
12 External Pressure Sensor Internal failure, contact WABCO.
14 Power Supply Failure
Verify correct electrical installation.
Check power supply.
Perform necessary repairs.
15 ECU Internal Failure
Verify correct installation. If code continues,
contact WABCO for assistance.
17 PLC Failure Internal failure, contact WABCO.
18 GIO Failure
Verify correct electrical installation.
Check power supply.
Perform necessary repairs.
19 Load Sensing Failure Internal failure, contact WABCO.
20 Axle Load Failure Internal failure, contact WABCO.
21 Brake Pad Sensor Failure Internal failure, contact WABCO.
To c ontact WABCO , call the WABCO Customer Care Center at 855-228-3203.