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STEP 4: Blink Codes for Knorr-Bremse A6 System 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 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

Knorr-Bremse A6 System ECU

Block 1

Block 2

Blink Code

Configuration

Blink Code

ABS Fault

1

2S/1M (24V)

1

No fault detected

2

2S/2M (24V)

2*

Wheel speed sensor - Axle 1, left

3

4S/2M-SL (24V)

3*

Wheel speed sensor - Axle 1, right

4

4S/3M-SL (24V)

4*

Wheel speed sensor - Axle 2, left

5

4S/4M (24V)

5*

Wheel speed sensor - Axle 2, right

6

6S/3M (24V)

6*

Wheel speed sensor - Axle 3, left

7

6S/4M (24V)

7*

Wheel speed sensor - Axle 3, right

8

-

8

Modulator valve - Axle 1, left

9

2S/1M (12V)

9

Modulator valve - Axle 1, right

10

6S/2M (12V)

10

Modulator valve - Axle 2, left

11

4S/2M-SL (12V)

11

Modulator valve - Axle 2, right

12

4S/3M-SL (12V)

12

Voltage out of tolerance

13

4S/4M (12V)

13

Valve relay cannot be switched

14

6S/3M (12V)

14

ECU internal fault

15

6S/4M (12V)

*If the ECU detects an excessive air gap between sensor and sensor ring, the last pulse is double length (approximately 0.4sec).

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