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STEP 4: Fault Codes for Haldex ABS Modular 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 Modular ECU

Code Displayed

Location

Type of Fault

Possible causes / Action

DDU

Info Centre

BLANK

BLANK

No supply on ignition switched line

Fuse blown. DDU / INFO CENTRE or cable fault. Open circuit B -

SENSOR BAR

SENSOR BAR

Bar displayed = Sensor output O.K.Bar not displayed = Sensor output too low

00

OK 00

N/A

No faults

System fully operational. No faults detected

01

S1A 01

Sensor 1A or wiring open or short circuit

Sensor output loss

Sensor connector loose, cable damaged or sensor faulty

02

S1B 02

Sensor 1B or wiring open or short circuit

03

S2A 03

Sensor 2A or wiring open or short circuit

04

S2B 04

Sensor 2B or wiring open or short circuit

05

S3A 05

Sensor 3A or wiring open or short circuit

06

S3B 06

Sensor 3B or wiring open or short circuit

07

OK 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

RET 08

Retarder relay or wiring open circuit

09

RET 09

Retarder relay or wiring open circuit

OA

RIDE OA

Reset to ride / wiring open circuit

OC

RIDE OC

Reset to ride / wiring open circuit

OE

LAMP OE

Warning lamp circuit fault

11

S1A 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

S1B 12

Sensor 1B, low output

13

S2A 13

Sensor 2A, low output

14

S2B 14

Sensor 2B, low output

15

S3A 15

Sensor 3A, low output

16

S3B 16

Sensor 3B, low output

20

EXC 20

Incorrect exciter ring fitted

Exciter group

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

21

S1A 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

S1B 22

Sensor 1B, intermittent low output

23

S2A 23

Sensor 2A, intermittent low output

24

S2B 24

Sensor 2B, intermittent low output

25

S3A 25

Sensor 3A, intermittent low output

26

S3B 26

Sensor 3B, intermittent low output

37

EXT 37

Diagnostic code sent to ABS ECU to activate multiple light sequence

40

XSEn 40

Sensor wiring crossed across an axle

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

41

SLW 41

Slow recovery of sensed wheel(s): red channel

42

SLW 42

Slow recovery of sensed wheel(s): blue channel

43

SLW 43

Slow recovery of sensed wheel(s): yellow channel

61

RDHd61

Red channel, hold solenoid or wiring

Open circuit solenoid or wiring

62

BUHd62

Blue channel, hold solenoid or wiring

63

YEHd63

Yellow channel, hold solenoid or wiring

67

RDDu67

Red channel, dump solenoid or wiring

68

BUDu68

Blue channel, dump solenoid or wiring

69

YEDu69

Yellow channel, dump solenoid or wiring

71

RDHd71

Red channel, hold solenoid or wiring

Short circuit modulator solenoid or wiring

72

BUHd72

Blue channel, hold solenoid or wiring

73

YEHd73

Yellow channel, hold solenoid or wiring

77

RDDu77

Red channel, dump solenoid or wiring

78

BUDu78

Blue channel, dump solenoid or wiring

79

YEDu79

Yellow channel, dump solenoid or wiring

80

SOL 80

Poor insulation is solenoid or wiring

Solenoid wiring short to B+ or low sol. resistance

81

RDHd81

Hold solenoid, red channel

82

BUHd82

Hold solenoid, blue channel

83

YEHd83

Hold solenoid, yellow channel

87

RDDu87

Dump solenoid red channel

88

BUDu88

Dump solenoid blue channel

89

YEDu89

Dump solenoid yellow channel

90

B+LO 90

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

Supply voltage group

91

ISOI 91

Faulty supply from ISO 7638 Pin 1 or fuse blown

92

B+HI 92

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

93

ECU 93

Internal ECU fault

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