Accumulator pressure sensing front axle
59
Accumulator pressure sensing rear axle
62
Accumulator pressure sensing rear axle
62
Accumulator pressure sensing rear axle
62
Electronic pressure control front axle pump
2580

13 Tire Combination

Electronic pressure control front axle pump

2580 57

Electronic pressure control front axle pump
Electronic pressure control front axle pump

2580 57
2580 57

ECU low voltage (< 10.0 V)
ECU high voltage (> 16.5 V)
Short to Bat B+
Short to Ground B­
Abnormal high pressure gradient (short charge time)
Short to Bat B+
Short to Ground B­
Abnormal high pressure gradient (short charge time)
Short to Bat B+
Pump monitor voltage unexpected low (motor monitor
4
indicates motor on although driver is off)
5 Supply voltage for pump motor missing
6

2.1, 2.4, 2.5
1.1
1.1
1.1
1.1
1.1
1.1
1.1
1.1
1.1
1.1
1.1
1.1
1.1
1.1
1.1
1.1
1.1
1.1
1.1
1.1
1.1
1.1
1.1
1.1
1.1
1.1
1.1
1.1
1.1
1.1
1.1
15.1
15.2
15.3
16.1
16.2
16.3
4.1
4.2
4.3
5.1
5.2
5.3

11.2 / 11.3
11.5
11.4
3.1
3.1
7.1
3.1
3.1
7.1
6.6
6.4
6.3
6.4

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IK0400046 ­ Wabco Full Power Hydraulic Brake Diagnostic Code (DTC) Index

Electronic pressure control front axle pump

2580 57

7

Electronic pressure control front axle pump

2580 57

8

Electronic pressure control front axle pump
Electronic pressure control front axle pump
Electronic pressure control rear axle pump

2580 57
2580 57
2581 60

9
10
3

Electronic pressure control rear axle pump

2581 60

4

Electronic pressure control rear axle pump

2581 60

5

Electronic pressure control rear axle pump

2581 60

6

Electronic pressure control rear axle pump

2581 60

7

Electronic pressure control rear axle pump

2581 60

8

Electronic pressure control rear axle pump
Electronic pressure control rear axle pump
Foot Brake Switch
Foot Brake Switch
Parking Brake Switch
Parking Brake Switch
Parking Brake System
Parking Brake System
Parking Brake System
J1939 Data link communication
J1939 Data link communication
J1939 Data link communication

2581
2581
246
246
70
70
619
619
619
231
231
231

9
10
3
10
3
10
3
4
13
5
12
9

60
60
246
246
70
70
61
61
61
231
231
231

Pump monitor voltage unexpected low (motor monitor
indicates motor on although driver is off)
Master cylinder brake circuit
Diaphragm accumulator precharge level too low (detected
by short run time and high switch on frequency)
Internal leakage too high
Abnormal low pressure gradient
Short to Bat B+
Pump monitor voltage unexpected low (motor monitor
indicates motor on although driver is off)
Supply voltage for pump motor missing
Pump monitor voltage unexpected low (motor monitor
indicates motor on although driver is off)
Master cylinder brake circuit
Diaphragm accumulator precharge level too low (detected
by short run time and high switch on frequency)
Internal leakage too high
Abnormal low pressure gradient
Out of Range
Long Term Supervision
Out of Range
Long Term Supervision
Could not be applied
Could not be released
Over Travel
Bus Error
Internal ECU Error
Message Time Out

Page 3 of 5

18.1
7.1
6.1
6.5
6.6
6.4
6.3
6.4
18.1
7.1
6.1
6.5
9.1
9.1
10.1
10.1
17.1
17.2
17.3
8.1
1.1
8.1

Diagnostics : Click here for Wabco Full Power brake manual S04048.
Ref

Number

1

Diagnostic Instructions
Wabco Electronic Control Unit ( ECU )

1.1
2

Replace ECU - Internal failure - Call OnTrac - Wabco for authorization if under warranty -

2.2
2.3
2.4

Wheel Speed Sensor / Tone Ring
Amplitude of sensor signal is too low. Check bearing play and tone ring run out. Eliminate root cause for air gap extension and
push sensor back in afterwards.
Wheel sizes or number of tone ring teeth are different.
Check J1939 Data Link Communication with Engine Controller ( ECM )
Check Tone Ring for Damage ( corrosion, missing or damaged teeth) Replace if necessary

2.5

Check sensor wiring and connectors for intermittent contact. Replace Sensor or repair wiring if necessary

2.6

Check for correct sensor to tone ring air gap - Air gap too large. Push sensor in if necessary
Pressure Sensors

2.1

3
3.1
4
4.1

Remove ECU and check pressure sensor connections. In case of visual damage on ECU-side change ECU, otherwise change
HCU.
Parking Brake Pressure Supply Valve
Shorted to Bat B+ Check connectors for shorts. If none found go to 1.1

4.2

Open Circuit -. Check wiring and connectors for intermittent contact. Replace coil if necessary. Check front axle pump motor fuse
and replace if broken. If further failure occurs go to 1.1

4.3

Shorted to ground. Check wiring and connectors for short to ground. Replace coil if necessary. Check front axle pump motor fuse
and replace if broken. If further failure occurs go to 1.1

5
5.1

Parking Brake Pressure Cut­ Off Valve
Shorted to Bat B+ Check connectors for shorts. If none found go to 1.1

5.2

Open Circuit -. Check wiring and connectors for intermittent contact. Replace coil if necessary. Check front axle pump motor fuse
and replace if broken. If further failure occurs go to 1.1

5.3

Shorted to ground. Check wiring and connectors for short to ground. Replace coil if necessary. Check front axle pump motor fuse
and replace if broken. If further failure occurs go to 1.1

6

Pump Motor
6.1

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IK0400046 ­ Wabco Full Power Hydraulic Brake Diagnostic Code (DTC) Index

Page 4 of 5

6.2
6.3

Check front axle pump motor circuit for external leakage. Observe frequency of pump motor operation. Proceed Diagnostic
Service to actuate the parking brake valves for about 3 minutes. If frequency is significant lower change supply valve. If not
change HCU. 1.1
Check rear axle pump motor circuit for external leakage. If no leakage found change HCU.
Check corresponding pump motor fuse and wiring and replace/repair if broken

6.4

Check if corresponding pump motor is able to run. If not change HCU. If pump motor runs permanently -> 1.1.

6.5

1. Check accumulator precharge level of the corresponding circuit by using Wabco Toolbox diagnostic software and replace
accumulator if necessary.
2. Check hose and pipes between master cylinder reservoir and HCU reservoir for any flow restrictions.
3. Run system without filler cap. Replace filler cap if failure disappears.
4. Bleed System according to bleeding procedure.
5. Replace Corresponding Pump in the HCU

6.6

Check pump motor current draw of the corresponding circuit. Current should be less than 30 A. If value exceeded change HCU. If
not exceeded ­> 1.1

7

Accumulator
7.1

8
8.1
9
9.1
10
10.1
11
11.1
11.2
11.3
11.4
11.5
12
12.1
13
13.1
14
14.1
15

Check accumulator precharge level of the corresponding circuit by using Wabco Toolbox diagnostic service and replace
accumulator if necessary.
J1939 Data Link
Check data link for continuity and proper resistance. Check EOL Resistor and all connections
Foot Brake Switch
Check switch wiring and connectors, replace Foot Brake Switch if necessary
Parking Brake Switch
Check switch wiring and connectors, replace parking brake switch if necessary.
Supply Voltage, Ground connection
Check valve supply voltage fuse and wiring. If fuse OK -> 1.1
Check wiring and connectors of the ECU ground connections.
Check wiring and connectors of reference ground.
Supply voltage too high. Check alternator and battery.
Supply voltage too low. Check alternator and battery.
ABS-Warning Light bulb
Check wiring and connections of the ABS-Warning light bulb. Replace bulb if necessary
Brake-Warning Light bulb
Check wiring and connections of the Brake-Warning light bulb. Replace bulb if necessary
Buzzer
Check wiring and connections of the Buzzer. Replace Buzzer if necessary
Endurance Brake Relay (EBR)

15.1

Shorted to Bat B+. Check wiring and connections of the EBR. Replace EBR if necessary. If further failure occurs -> 1.1.

15.2

Open circuit. Check wiring and connections of the EBR. Replace EBR if necessary. If further failure occurs ­> 1.1.

15.3

Shorted to Ground B-. Check wiring and connections of the EBR. Replace EBR if necessary. If further failure occurs -> 1.1.

16.1
16.2
16.3

Brake Light Signal (BLS)
Shorted to Bat B+. Check wiring and connections of the BLS. If further failure occurs-> 1.1.
Open circuit. Check wiring and connections of the BLS. If further failure occurs ->1.1.
Shorted to Ground. Check wiring and connections of the BLS. If further failure occurs -> 1.1.
SAHR (Parking Brake System)

17.1

Parking Brake could not be applied.
- Check SAHR for correct mechanical functionality
­ Check brake lining (overtravel)
- Check travel switch (always in the released position)
­ Check pressure supply valve
­ Check pressure cut off valve

17.2

Parking Brake could not be released
- Check SAHR for correct mechanical functionality
­ Check travel switch (always in the applied position)
- Check SAHR chamber for leakage- Check pressure supply valve
­ Check pressure cut off valve
- Check brake line to SAHR

17.3

SAHR overtravel detected
Check actuation cable between SAHR and drive line brake.
Check SAHR brake lining.

18.1

Master Cylinder Circuit /Relay Valves
Check Relay Valve of the corresponding circuit.
- Check brake lines between Master Cylinder and Relay Valves of the corresponding circuit.
­ Check bleeding condition for Master Cylinder circuit.

16

17

18

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IK0400046 ­ Wabco Full Power Hydraulic Brake Diagnostic Code (DTC) Index

Page 5 of 5

- Check brake performance on dynamometer if possible.
­ Check Master Cylinder itself.

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