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STEP 4: Blink Codes for Wabco D version ECU

  1. Use the table to identify ABS faults from the ECU Blink Codes recorded in STEP 3: Blink code identification and system response
  2. Links to solutions for common ABS faults can also be found below
  3. Please ensure all necessary Health and Safety precautions are implemented and adhered to before commencing any repair work
  4. A list of useful ABS Diagnostic Tools is available on this website
  5. If you require further help or information, please contact us

Wabco D version ECU (shape 1)

Wabco D version ECU (shape 2)

Blink Code

Location

Type of Fault

Action Required

2-1

Right front steering axle

ABS modulator valve

Check ABS modulator valve, valve cable, and connectors

12-volt system: Verify 4.0-9.0 ohms resistance (ABS modulator valve)

24-volt system: Verify 11.0-21.0 ohms resistance (ABS modulator valve)

Refer to service information provided by manufacturer

2-2

Left front steering axle

2-3

Right rear drive axle

2-4

Left rear drive axle

2-5

Right rear/additional axle

2-6

Left rear/additional axle

3-1

Right front steering axle

Too much sensor gap

Adjust wheel sensor to touch tooth wheel

Check sensor gap

Check for loose wheel bearings or excessive hub runout

Verify minimum 0.2 volts AC output @ 30 RPM

3-2

Left front steering axle

3-3

Right rear drive axle

3-4

Left rear drive axle

3-5

Right rear/additional axle

3-6

Left rear/additional axle

4-1

Right front steering axle

Sensor short circuit, or open circuit

Check sensor, sensor cable, and connectors

Verify 900-2000 ohms resistance

Repair or replace as needed

 

4-2

Left front steering axle

4-3

Right rear drive axle

4-4

Left rear drive axle

4-5

Right rear/additional axle

4-6

Left rear/additional axle

5-1

Right front steering axle

Sensor signal erratic

Check for tyre size mismatch or tooth wheel difference

Check sensor, sensor cable, and connector for intermittent contact

5-2

Left front steering axle

5-3

Right rear drive axle

5-4

Left rear drive axle

5-5

Right rear/additional axle

5-6

Left rear/additional axle

6-1

Right front steering axle

Tooth wheel

Check for damaged tooth wheel. Repair or replace as needed

6-2

Left front steering axle

6-3

Right rear drive axle

6-4

Left rear drive axle

6-5

Right rear/additional axle

6-6

Left rear/additional axle

7-1

J1922 or J1939 datalink

System function

Check for proper data link connection (J1922 and J1939)

Verify wheel spin on each axle

7-2

ATC valve

System function

Check ATC Valve, valve cables, and connectors

Verify 7 to 14 ohms resistance for a 12-volt system, 28-49 ohms resistance for a 24-volt system

7-3

Retarder relay (third brake)

System function

Check retarder (third brake) connections

7-4

ABS indicator lamp

System function

Check ABS indicator light connections

Verify blink code switch was activated longer than 16 seconds

7-5

ATC configuration

System function

Verify proper ATC set-up

7-6

Reserved for future use

System function

Verify accuracy of blink code and clear from ECU memory

8-1

Low power supply

ECU

Check for low voltage

Check vehicle voltage, fuse, and supply to ECU (9.5-14 volts)

8-2

High power supply

ECU

Check for high voltage

Check vehicle voltage (9.5-14 volts for a 12-volt system, 18-30 volts for a 24-volt system)

Verify accuracy of blink code and clear from ECU memory

8-3

Internal fault

ECU

Verify accuracy of blink code and clear from ECU memory

8-4

System configuration error

ECU

Verify all ECU connectors are in place

Verify accuracy of blink code and clear from ECU memory

If code does not clear, it may be necessary to replace the ECU

8-5

Ground

ECU

(Full function, cab-mounted only)

Check all ABS valve ground connections for diagonals 1 and 2 (open, shorted to ground or shorted to battery).

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