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STEP 4: Fault Codes for Haldex ABS Modal ECU

  1. Use the table to identify ABS faults from the ECU Fault Codes recorded in STEP 3 using either a DDU, or the INFO CENTRE
  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

Haldex ABS Modal ECU

Blink Code

Location

Type of Fault

Possible causes / Action

00

N/A

No faults

System fully operational. No faults detected

01

Sensor 1A or wiring open or short circuit

Sensor output loss

Sensor connector loose, cable damaged or sensor faulty

02

Sensor 1B or wiring open or short circuit

03

Sensor 2A or wiring open or short circuit

04

Sensor 2B or wiring open or short circuit

05

Sensor 3A or wiring open or short circuit

06

Sensor 3B or wiring open or short circuit

07

System O.K. but all sensors have no output

Drive above 6mph (10km/h), sensor bars will appear if sensors are O.K.

08

Retarder relay or wiring open circuit

09

Retarder relay or wiring open circuit

11

Sensor 1A, low output

Low sensor output group

Sensor worn, sensor connector loose, poorly adjusted sensor, wiring open or short circuit, short across conductors in cable

12

Sensor 1B, low output

13

Sensor 2A, low output

14

Sensor 2B, low output

15

Sensor 3A, low output

16

Sensor 3B, low output

20

Incorrect exciter ring fitted

Exciter group

Check teeth on exciter ring (i.e. 80 tooth instead of 100 tooth and vice versa)

21

Sensor 1A, intermittent low output

Intermittent low sensor output group

Loose or incorrectly adjusted sensor, sensor connector loose, bracket or exciter ring loose, damaged exciter ring, worn sensor cable insulation

22

Sensor 1B, intermittent low output

23

Sensor 2A, intermittent low output

24

Sensor 2B, intermittent low output

25

Sensor 3A, intermittent low output

26

Sensor 3B, intermittent low output

41

Slow recovery of sensed wheel(s): red channel

Sensed wheel slow recovery group

Slow brake release, check foundation brake for mechanical faults, dry bearings, broken springs, restricted piping. Check for kinks and blockages etc. Check for incorrectly wired sensors and modulator solenoids, incorrect piping or modulator fault

42

Slow recovery of sensed wheel(s): blue channel

43

Slow recovery of sensed wheel(s): yellow channel

61

Red channel, hold solenoid or wiring

Open circuit solenoid or wiring

62

Blue channel, hold solenoid or wiring

63

Yellow channel, hold solenoid or wiring

67

Red channel, dump solenoid or wiring

68

Blue channel, dump solenoid or wiring

69

Yellow channel, dump solenoid or wiring

71

Red channel, hold solenoid or wiring

Short circuit modulator solenoid or wiring

72

Blue channel, hold solenoid or wiring

73

Yellow channel, hold solenoid or wiring

77

Red channel, dump solenoid or wiring

78

Blue channel, dump solenoid or wiring

79

Yellow channel, dump solenoid or wiring

80

Poor insulation is solenoid or wiring

Solenoid wiring short to B+ or low sol. resistance

81

Hold solenoid, red channel

82

Hold solenoid, blue channel

83

Hold solenoid, yellow channel

87

Dump solenoid red channel

88

Dump solenoid blue channel

89

Dump solenoid yellow channel

90

ECU supply voltage <18V (<9V on 12V system) when solenoid energised

Supply voltage group

91

Faulty supply from ISO 7638 Pin 1 or fuse blown

92

ECU supply voltage >32V (<16V on 12V system)

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