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STEP 4: Blink Codes for Knorr-Bremse A15 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 A15 System ECU

Block 1

Block 2

Blink Code

Configuration

Blink Code

ABS Fault

ELF Fault

1

2S/1M

1

No ABS faults

No ELF faults

2

2S/2M

2*

Wheel speed sensor - DFA#

ELF height sensor - WS1#

3

4S/2M SR**

3*

Wheel speed sensor - DFB#

ELF height sensor - WS2#

4

4S/2M AR**

4*

Wheel speed sensor - DFC#

ELF pressure sensor - DS#

5

4S/3M

5*

Wheel speed sensor - DFD#

6

Ground fault - GNDL#

7

Power output - UWS#

8

Modulator valve - MVA#

ELF control valve - MVN#

9

Modulator valve - MVB#

ELF control valve - MVL#

10

Modulator valve - MVC#

11

ECU / Modulator ground - GND#

12

Power supply

13

Fault in circuit connected to 'UNI' pin#

14

ECU internal fault

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

**SR = Side for side control. AR = Axle for axle control

#Signifies the connection on the ECU to which the faulty component is connected. Refer to relevant circuit diagram for A9 system

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