IK0400046 ­ Wabco Full Power Hydraulic Brake Diagnostic Code (DTC) Index Page 1 of 5

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Title : Wabco Full Power Hydraulic Brake Diagnostic Code (DTC) Index

Applies To : All Vehicles with Wabco Full Power Hydraulic Brakes

NOTE:
Merritor WABCO requires pre-authorization for all repairs over $125. For any repairs above that amount, you must contact Ontrac at 1-800-
535-5560 prior to making the repair. For further information look at warranty policy letter 05-003G and 04­004G

Click here for Wabco Full Power brake manual S04048.

Wabco Full Power Hydraulic Brake Diagnostic codes and related diagnostics

Diagnostic Instructions
Component SPN SID PID FMI System Fault
Click on number

Wheel Sensor Right Front 2 2 1 Air Gap 2.1, 2.4

Wheel Sensor Right Front 2 2 5 Impedance 2.5
Wheel Sensor Right Front 2 2 7 Pole Wheel 2.4
Wheel Sensor Right Front 2 2 8 No Trigger 2.1, 2.3, 2.4, 2.5, 2.6
Wheel Sensor Right Front 2 2 11 Brake Chatter
Wheel Sensor Right Front 2 2 13 Tire Combination 2.2
Wheel Sensor Left Rear 3 3 1 Air Gap 2.1, 2.4
Wheel Sensor Left Rear 3 3 5 Impedance 2.5
Wheel Sensor Left Rear 3 3 7 Pole Wheel 2.4
Wheel Sensor Left Rear 3 3 8 No Trigger 2.1, 2.3, 2.4, 2.5, 2.6
Wheel Sensor Left Rear 3 3 11 Brake Chatter
Wheel Sensor Left Rear 3 3 13 Tire Combination 2.2
Wheel Sensor Left Front 1 1 1 Air Gap 2.1, 2.4
Wheel Sensor Left Front 1 1 5 Impedance 2.5
Wheel Sensor Left Front 1 1 7 Pole Wheel 2.4
Wheel Sensor Left Front 1 1 8 No Trigger 2.1, 2.3, 2.4, 2.5, 2.6
Wheel Sensor Left Front 1 1 11 Brake Chatter
Wheel Sensor Left Front 1 1 13 Tire Combination 2.2
Wheel Sensor Right Rear 4 4 1 Air Gap 2.1, 2.4
Wheel Sensor Right Rear 4 4 5 Impedance 2.5
Wheel Sensor Right Rear 4 4 7 Pole Wheel 2.4
Wheel Sensor Right Rear 4 4 8 No Trigger 2.1, 2.3, 2.4, 2.5, 2.6
Wheel Sensor Right Rear 4 4 11 Brake Chatter
Wheel Sensor Right Rear 4 4 13 Tire Combination 2.2
Inlet valve actuation time not plausible
Wheel Speed Sensors All 254 254 9 2.1, 2.4, 2.5
(75 % switch on time within 5 minutes)
Main controller ECU 254 254 12 1.1
Inlet Valve Right Front 43 43 3 Short to Bat B+ 1.1
Inlet Valve Right Front 43 43 5 Open Circuit 1.1
Inlet Valve Right Front 43 43 6 Short to Ground B­ 1.1
Outlet Valve Right Front 49 49 3 Short to Bat B+ 1.1
Outlet Valve Right Front 49 49 5 Open Circuit 1.1
Outlet Valve Right Front 49 49 6 Short to Ground B­ 1.1
Inlet Valve Left Front 42 42 3 Short to Bat B+ 1.1
Inlet Valve Left Front 42 42 5 Open Circuit 1.1

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Inlet Valve Left Front 42 42 6 Short to Ground B­ 1.1

Outlet Valve Left Front 48 48 3 Short to Bat B+ 1.1
Outlet Valve Left Front 48 48 5 Open Circuit 1.1
Outlet Valve Left Front 48 48 6 Short to Ground B­ 1.1
Inlet Valve Left Rear 44 44 3 Short to Bat B+ 1.1
Inlet Valve Left Rear 44 44 5 Open Circuit 1.1
Inlet Valve Left Rear 44 44 6 Short to Ground B­ 1.1
Outlet Valve Left Rear 50 50 3 Short to Bat B+ 1.1
Outlet Valve Left Rear 50 50 5 Open Circuit 1.1
Outlet Valve Left Rear 50 50 6 Short to Ground B­ 1.1
Inlet Valve Right Rear 45 45 3 Short to Bat B+ 1.1
Inlet Valve Right Rear 45 45 5 Open Circuit 1.1
Inlet Valve Right Rear 45 45 6 Short to Ground B­ 1.1
Outlet Valve Right Rear 51 51 3 Short to Bat B+ 1.1
Outlet Valve Right Rear 51 51 5 Open Circuit 1.1
Outlet Valve Right Rear 51 51 6 Short to Ground B­ 1.1
ATC NC 18 18 3 Short to Bat B+ 1.1
ATC NC 18 18 5 Open Circuit 1.1
ATC NC 18 18 6 Short to Ground B­ 1.1
ATC NO 19 19 3 Short to Bat B+ 1.1
ATC NO 19 19 5 Open Circuit 1.1
ATC NO 19 19 6 Short to Ground B­ 1.1
Brake Relay 13 13 3 Short to Bat B+ 15.1
Brake Relay 13 13 5 Open Circuit 15.2
Brake Relay 13 13 6 Short to Ground B­ 15.3
Brake Light Signal 100 100 3 Short to Bat B+ 16.1
Brake Light Signal 100 100 5 Open Circuit 16.2
Brake Light Signal 100 100 6 Short to Ground B­ 16.3
Park Brake Press Supply Valve 234 234 3 Short to Bat B+ 4.1
Park Brake Press Supply Valve 234 234 5 Open Circuit 4.2
Park Brake Press Supply Valve 234 234 6 Short to Ground B­ 4.3
Park Brake Press Cut-Off Valve 235 235 3 Short to Bat B+ 5.1
Park Brake Press Cut-Off Valve 235 235 5 Open Circuit 5.2
Park Brake Press Cut-Off Valve 235 235 6 Short to Ground B­ 5.3
Internal valve relay (provides supply voltage for
30 30 3 Can't Switch Off 1.1
ABS/ATC pressure control valves )
Internal valve relay (provides supply voltage for
30 30 4 Can't Switch On 11.1
ABS/ATC pressure control valves )
ABS warning light bulb (if available) 1438 23 5 No continuity to bulb 12.1
Brake warning light bulb (if available) 1439 101 5 No continuity to bulb 13.1
Buzzer (if available) 224 224 5 No continuity to Buzzer 14.1
ECU main ground or reference ground
98 98 2 Supply Voltage, Ground Connection 11.2 / 11.3
connection
ECU Battery Voltage 251 251 4 ECU low voltage (< 10.0 V) 11.5
ECU Battery Voltage 251 251 3 ECU high voltage (> 16.5 V) 11.4
Accumulator pressure sensing front axle 59 59 3 Short to Bat B+ 3.1
Accumulator pressure sensing front axle 59 59 4 Short to Ground B­ 3.1
Accumulator pressure sensing front axle 59 59 10 Abnormal high pressure gradient (short charge time) 7.1
Accumulator pressure sensing rear axle 62 62 3 Short to Bat B+ 3.1
Accumulator pressure sensing rear axle 62 62 4 Short to Ground B­ 3.1
Accumulator pressure sensing rear axle 62 62 10 Abnormal high pressure gradient (short charge time) 7.1
Electronic pressure control front axle pump 2580 57 3 Short to Bat B+ 6.6
Pump monitor voltage unexpected low (motor monitor
Electronic pressure control front axle pump 2580 57 4 6.4
indicates motor on although driver is off)
Electronic pressure control front axle pump 2580 57 5 Supply voltage for pump motor missing 6.3
Pump monitor voltage unexpected low (motor monitor
Electronic pressure control front axle pump 2580 57 6 6.4
indicates motor on although driver is off)
Electronic pressure control front axle pump 2580 57 7 Master cylinder brake circuit 18.1
Diaphragm accumulator precharge level too low (detected
Electronic pressure control front axle pump 2580 57 8 7.1
by short run time and high switch on frequency)
Electronic pressure control front axle pump 2580 57 9 Internal leakage too high 6.1
Electronic pressure control front axle pump 2580 57 10 Abnormal low pressure gradient 6.5
Electronic pressure control rear axle pump 2581 60 3 Short to Bat B+ 6.6
Pump monitor voltage unexpected low (motor monitor
Electronic pressure control rear axle pump 2581 60 4 6.4
indicates motor on although driver is off)
Electronic pressure control rear axle pump 2581 60 5 Supply voltage for pump motor missing 6.3
Pump monitor voltage unexpected low (motor monitor
Electronic pressure control rear axle pump 2581 60 6 6.4
indicates motor on although driver is off)

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Electronic pressure control rear axle pump 2581 60 7 Master cylinder brake circuit 18.1
Diaphragm accumulator precharge level too low (detected
Electronic pressure control rear axle pump 2581 60 8 7.1
by short run time and high switch on frequency)
Electronic pressure control rear axle pump 2581 60 9 Internal leakage too high 6.1
Electronic pressure control rear axle pump 2581 60 10 Abnormal low pressure gradient 6.5
Foot Brake Switch 246 246 3 Out of Range 9.1
Foot Brake Switch 246 246 10 Long Term Supervision 9.1
Parking Brake Switch 70 70 3 Out of Range 10.1
Parking Brake Switch 70 70 10 Long Term Supervision 10.1
Parking Brake System 619 61 3 Could not be applied 17.1
Parking Brake System 619 61 4 Could not be released 17.2
Parking Brake System 619 61 13 Over Travel 17.3
J1939 Data link communication 231 231 5 Bus Error 8.1
J1939 Data link communication 231 231 12 Internal ECU Error 1.1
J1939 Data link communication 231 231 9 Message Time Out 8.1

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

Ref Number Diagnostic Instructions

1 Wabco Electronic Control Unit ( ECU )

1.1 Replace ECU - Internal failure - Call OnTrac - Wabco for authorization if under warranty -
2 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
2.1
push sensor back in afterwards.
2.2 Wheel sizes or number of tone ring teeth are different.
2.3 Check J1939 Data Link Communication with Engine Controller ( ECM )
2.4 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
3 Pressure Sensors
Remove ECU and check pressure sensor connections. In case of visual damage on ECU-side change ECU, otherwise change
3.1
HCU.
4 Parking Brake Pressure Supply Valve
4.1 Shorted to Bat B+ Check connectors for shorts. If none found go to 1.1

Open Circuit -. Check wiring and connectors for intermittent contact. Replace coil if necessary. Check front axle pump motor fuse
4.2
and replace if broken. If further failure occurs go to 1.1

Shorted to ground. Check wiring and connectors for short to ground. Replace coil if necessary. Check front axle pump motor fuse
4.3
and replace if broken. If further failure occurs go to 1.1

5 Parking Brake Pressure Cut­ Off Valve

5.1 Shorted to Bat B+ Check connectors for shorts. If none found go to 1.1

Open Circuit -. Check wiring and connectors for intermittent contact. Replace coil if necessary. Check front axle pump motor fuse
5.2
and replace if broken. If further failure occurs go to 1.1

Shorted to ground. Check wiring and connectors for short to ground. Replace coil if necessary. Check front axle pump motor fuse
5.3
and replace if broken. If further failure occurs go to 1.1

6 Pump Motor
Check front axle pump motor circuit for external leakage. Observe frequency of pump motor operation. Proceed Diagnostic
6.1 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
6.2 Check rear axle pump motor circuit for external leakage. If no leakage found change HCU.
6.3 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.

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.
6.5
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

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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
Check accumulator precharge level of the corresponding circuit by using Wabco Toolbox diagnostic service and replace
7.1
accumulator if necessary.
8 J1939 Data Link
8.1 Check data link for continuity and proper resistance. Check EOL Resistor and all connections
9 Foot Brake Switch
9.1 Check switch wiring and connectors, replace Foot Brake Switch if necessary
10 Parking Brake Switch
10.1 Check switch wiring and connectors, replace parking brake switch if necessary.
11 Supply Voltage, Ground connection
11.1 Check valve supply voltage fuse and wiring. If fuse OK -> 1.1
11.2 Check wiring and connectors of the ECU ground connections.
11.3 Check wiring and connectors of reference ground.
11.4 Supply voltage too high. Check alternator and battery.
11.5 Supply voltage too low. Check alternator and battery.
12 ABS-Warning Light bulb
12.1 Check wiring and connections of the ABS-Warning light bulb. Replace bulb if necessary
13 Brake-Warning Light bulb
13.1 Check wiring and connections of the Brake-Warning light bulb. Replace bulb if necessary
14 Buzzer
14.1 Check wiring and connections of the Buzzer. Replace Buzzer if necessary
15 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 Brake Light Signal (BLS)

16.1 Shorted to Bat B+. Check wiring and connections of the BLS. If further failure occurs-> 1.1.
16.2 Open circuit. Check wiring and connections of the BLS. If further failure occurs ->1.1.
16.3 Shorted to Ground. Check wiring and connections of the BLS. If further failure occurs -> 1.1.
17 SAHR (Parking Brake System)
Parking Brake could not be applied.
- Check SAHR for correct mechanical functionality
­ Check brake lining (overtravel)
17.1
- Check travel switch (always in the released position)
­ Check pressure supply valve
­ Check pressure cut off valve

Parking Brake could not be released

- Check SAHR for correct mechanical functionality
- Check travel switch (always in the applied position)
17.2
- Check SAHR chamber for leakage- Check pressure supply valve
­ Check pressure cut off valve
- Check brake line to SAHR
SAHR overtravel detected
17.3 Check actuation cable between SAHR and drive line brake.
Check SAHR brake lining.
18 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.
18.1 ­ Check bleeding condition for Master Cylinder circuit.
­ Check brake performance on dynamometer if possible.
- Check Master Cylinder itself.

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