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ABS Troubleshooting for Trucks, Trailers, and Buses

 

STEP 4: Blink Codes for Wabco C2 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 C2 version ECU (shape 1)

Wabco C2 version ECU (shape 2)

Blink Code

Location

Cause

Solution

1-0-0

N/A

No Faults - System O.K.

No action needed

2-0-0

4-0-0

1-6-6

Voltage Relay 1

Low voltage to the diagonal relay or defective relay

Check vehicle voltage or replace relay if needed

2-6-6

4-6-6

1-6-7

Voltage Relay 2

2-6-7

4-6-7

1-6-8

Right Front Wheel

Erratic wheel speed signal from the steering axle

Check for loose wheel bearings, faulty sensor wiring connections, excessive hub runout, a sensor gap that is too wide, or damage to tooth wheels on steering axle

2-6-8

4-6-8

1-6-9

Left Front Wheel

2-6-9

4-6-9

1-6-10

Right Front Wheel

Sensor circuit failure on steering axle

Check sensor, sensor cable and cable connections

2-6-10

4-6-10

1-6-11

Left Front Wheel

2-6-11

4-6-11

1-6-12

Right Front Wheel

Steering axle sensor out of adjustment

Adjust sensors on steering axle

2-6-12

4-6-12

1-6-13

Left Front Wheel

2-6-13

4-6-13

1-7-0

Left Rear Wheel

Erratic wheel speed from drive axle

Check for loose wheel bearings, faulty sensor wiring connections, excessive hub runout, a sensor gap that is too wide, or damage to tooth wheels on drive axle

2-7-0

4-7-0

1-7-1

Right Rear Wheel

2-7-1

4-7-1

1-7-2

Left Rear Wheel

Sensor circuit failure on drive axle

Check sensor, sensor cable and cable connections

2-7-2

4-7-2

1-7-3

Right Rear Wheel

2-7-3

4-7-3

1-7-4

Left Rear Wheel

Drive axle sensor out of adjustment

Adjust sensors on drive axle. Check for differences between steer and drive tyre sizes

2-7-4

4-7-4

1-7-5

Right Rear Wheel

2-7-5

4-7-5

1-8-3

N/A

Improperly wired J1922 Engine Data Link. Short circuit to power or ground, or open circuit

Check J1922 Engine Data Link, cable and connections

2-8-3

4-8-3

1-8-5

N/A

Improperly wired J1922 Engine Data Link. Short circuit to power or ground, or open circuit

Check J1922 Engine Data Link, cable and connections

2-8-5

4-8-5

1-8-7

N/A

Message error detected in J1922 Engine Data Link

Erase fault from ECU memory. No other action required

2-8-7

4-8-7

1-8-9

N/A

2-8-9

4-8-9

1-8-10

Right Front Wheel

Short circuit in steering axle ABS valve-to-ground connection

Check ABS valve and cable. Replace as required

2-8-10

4-8-10

1-8-11

Left Front Wheel

2-8-11

4-8-11

1-8-12

Right Front Wheel

Open circuit in steering axle ABS valve or cable

Check ABS valve and cable. Replace as required

2-8-12

4-8-12

1-8-13

Left Front Wheel

2-8-13

4-8-13

1-8-14

Right Front Wheel

Short circuit in steering axle ABS valve-to-ground connection

Check ABS valve and cable. Replace as required

2-8-14

4-8-14

1-8-15

Left Front Wheel

2-8-15

4-8-15

1-9-0

Right Front Wheel

Open circuit in steering axle ABS valve or cable

Check ABS valve and cable. Replace as required

2-9-0

4-9-0

1-9-1

Left Front Wheel

2-9-1

4-9-1

1-9-2

Left Rear Wheel

Short circuit to ground in drive axle ABS valve or cable

Check ABS valve and cable. Replace as required

2-9-2

4-9-2

1-9-3

Right Rear Wheel

2-9-3

4-9-3

1-9-4

Left Rear Wheel

Open circuit in drive axle ABS valve or cable

Check ABS valve and cable. Replace as required

2-9-4

4-9-4

1-9-5

Right Rear Wheel

2-9-5

4-9-5

1-9-6

Left Rear Wheel

Short circuit to ground in drive axle ABS valve or cable

Check ABS valve and cable. Replace as required

2-9-6

4-9-6

1-9-7

Right Rear Wheel

2-9-7

4-9-7

1-9-8

Left Rear Wheel

Open circuit in drive axle ABS valve or cable

Check ABS valve and cable. Replace as required

2-9-8

4-9-8

1-9-9

Right Rear Wheel

2-9-9

4-9-9

1-10-2

Left Rear Wheel

Short circuit in ATC valve to ground connection

Check ATC valve and cable. Replace as required

2-10-2

4-10-2

1-10-3

Right Rear Wheel

2-10-3

4-10-3

1-10-4

Left Rear Wheel

Open circuit in ATC valve or cable

Check ATC valve and cable. Replace as required

2-10-4

4-10-4

1-10-5

Right Rear Wheel

2-10-5

4-10-5

1-10-7

N/A

Short circuit in wiring or relay that controls engine brake

Check engine brake relay and wiring to relay coil

2-10-7

4-10-7

1-10-8

Left Rear Wheel

Excessive drive axle wheel spin caused by driver or dynamometer

Check steer axle sensor gap. Erase fault from ECU memory

2-10-8

4-10-8

1-10-9

Right Rear Wheel

2-10-9

4-10-9

1-11-12

Right Front Wheel

Short circuit between steering axle ABS valve and power supply connection

Check ABS valve and cable. Replace as required

2-11-12

4-11-12

1-11-13

Left Front Wheel

2-11-13

4-11-13

1-11-14

Left Rear Wheel

Short circuit between drive axle ABS valve and power supply connection

Check ABS valve and cable. Replace as required

2-11-14

4-11-14

1-11-15

Right Rear Wheel

2-11-15

4-11-15

1-12-2

Left Rear Wheel

Short circuit between ATC valve and power supply connection

Check ATC valve and cable. Replace as required

2-12-2

4-12-2

1-12-3

Right Rear Wheel

2-12-3

4-12-3

1-12-4

N/A

Short circuit between pin 12 of ABS ECU and power supply connection

Check ECU harness

2-12-4

4-12-4

1-12-7

N/A

Short circuit between engine brake and ground connection

Check engine brake relay

2-12-7

4-12-7

1-12-8

Right Front Wheel

Short circuit between steering axle ABS valve and battery

Check ABS valve and cable. Replace as required

2-12-8

4-12-8

1-12-9

Left Front Wheel

2-12-9

4-12-9

1-12-10

Left Rear Wheel

Short circuit between steering axle ABS valve and battery

Check ABS valve and cable. Replace as required

2-12-10

4-12-10

1-12-11

Right Rear Wheel

2-12-11

4-12-11

1-12-14

Left Rear Wheel

Short circuit between steering axle ATC valve and battery

Check ATC valve and cable. Replace as required

2-12-14

4-12-14

1-12-15

Right Rear Wheel

2-12-15

4-12-15

1-13-0

N/A

Short circuit between pin 12 of ABS ECU and battery

Check ECU harness

2-13-0

4-13-0

1-13-4

Voltage Relay 1

Diagonal valve relay not operating correctly

Check diagonal valve relay

2-13-4

4-13-4

1-13-5

Voltage Relay 2

2-13-5

4-13-5

1-13-8

Voltage Relay 1

Power supply voltage too high

Repair vehicle power supply

2-13-8

4-13-8

1-13-9

Voltage Relay 2

2-13-9

4-13-9

First digit of Blink Code identifies system configuration: 1 = 6S/6M, 2 = 4S/4M, 4 = 6S/4M

Blink Code: Axle 3

Cause

Solution

Left

Right

1-7-8

1-7-9

Erratic wheel speed from third axle

Check for loose wheel bearings, faulty sensor wiring connections, excessive hub runout, sensor gap that is too wide or damage to tooth wheels on third axle

4-7-8

4-7-8

1-7-10

1-7-11

Sensor circuit failure on third axle

Check sensor, sensor cable and cable connections

4-7-10

4-7-11

1-7-12

1-7-13

Third axle sensor out of adjustment

Adjust sensors on third axle. Check for differences between steer and rear tire sizes

4-7-12

4-7-13

1-9-10

1-9-11

Short circuit to ground in third axle ABS valve or cable

Check ABS valve and cable. Replace as required

1-9-12

1-9-13

Open circuit in third axle ABS valve or cable

Check ABS valve and cable. Replace as required

1-9-14

1-9-15

Short circuit to ground in third axle ABS valve or cable

Check ABS valve and cable. Replace as required

1-10-0

1-10-1

Open circuit in third axle ABS valve or cable

Check ABS valve and cable. Replace as required

1-12-0

1-12-1

Short circuit in connection between third axle ABS valve and battery

Check ABS valve and cable. Replace as required

1-12-12

1-12-13

Short circuit in connection between third axle ABS valve and battery

Check ABS valve and cable. Replace as required

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