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STEP 4: Blink Codes for Knorr-Bremse Gamma CP 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 Gamma CP System ECU

Block 1

Block 2

Blocks 3 and 4

Blink Code

Configuration

Blink Code

Configuration

Blink Code

Fault

2

ABS without brake activation and engine control

2

IRM at front axle

1

No faults

5

ABS with brake activation and engine control

2

Internal ECU fault

3

Wheel speed sensor front air gap too big

4

Wheel speed sensor rear air gap too big

6

Wheel speed sensor front open circuit

7

Wheel speed sensor rear open circuit

9

Low voltage or valve relay not operational

10

Pressure control valve - front valve faulty

11

Pressure control valve - rear valve faulty

13

Relay burnt, sticking

14

Path: ASR-Valve brake activation

15

Path: Proportional valve, speed signal

18

Difference in wheel diameter

19

DBR relay signal path

20

CAN-Bus fault

21

Stop lamp was not successfully checked since the last "power on"

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