Isuzu N-Series. Service manual - part 260

5A4-14 ABS/ASR

J-9

J-74

J-74

J-75

J-75

J-148

J-148

J-149

No.

Connector Face

000-001

002-012

1

2

002-011

1

2

002-012

1

2

002-011

1

2

002-012

1

2

002-011

1

2

002-012

1

2

J-149

J-177

J-177

J-191

P-1

P-2

P-3

P-4

No.

Connector Face

002-011

1

2

034-001

034-002

5

6

25

44

63

7

26

45

64

8

27

46

65

9

28

47

66

10

29

48

67

11

30

49

68

12

31

50

69

13

32

51

70

14

33

52

71

15

34

53

72

16

35

54

73

17

36

55

74

18

37

56

75

19

38

57

76

20

39

58

77

21

40

59

78

22

41

60

79

23

42

61

80

24

43

62

81

4

1

3

2

081-001

000-004

000-006

000-006

000-004

ABS/ASR 5A4-15

H-5

H-6

H-7

H-8

Procedure of Trouble Diagnosis

Description of Diagnosis

Trouble symptom related to ABS and ASR can be clas-
sified into two kinds; one is with ABS/ASR warning lamp
illumination pattern, the other is from the trouble symp-
toms noticeable by the driver.
Refer to “Diagnosis with illumination pattern” in the first
case, and “List of trouble symptoms” in the latter case
for diagnostic procedures. Also, diagnostics with Tech 2
is available. Refer to sections 5A and 5C for the diagno-
sis of mechanical trouble, including brake noise, brake
judder (vibration of pedal or vehicle body during normal
brake operation), break pulling to one side, parking
brake fault.

About Self-Diagnosis

Self-diagnosis function is equipped with the EHCU, it
performs the checks as shown in the illustration below to

P-5

X-4

No.

Connector Face

000-002

005-006

N5A2011E

N5A2012E

N5A2012E

N5A2012E

5A4-16 ABS/ASR

examine the system for fault and identify the trouble part
every time the system starts. If it found to be faulty, the
system illuminates the ABS/ASR warning lamp to notify
the fault, and stores the diagnostic trouble code (DTC).
Illumination pattern differ depending on the fault condi-
tion; refer to “Diagnostic procedure with illumination pat-
tern” described in later, and check and repair according
to the relevant flow chart.

CAUTION:

Lamp illumination is reset every time the starter switch
is OFF (system OFF), however the diagnosis code will
not be erased unless it is compulsory erased. In case of
faults while driving and intermittent fault, the control unit
may judge it as normal at the time of diagnosis and indi-
cate the normal code. Therefore perform the check and
repair according to the diagnosis flow.

How to Indicate Trouble Codes

The vehicle must be parked (vehicle speed 3.3km/h (2
mph) or less). Short the terminal No. 12 with No. 4 or 5
(ground) of the self-diagnosis connector, and turn the
starter switch to ON. The ABS/ASR warning lamp will
blink to indicate the diagnosis trouble code.

The normal code 12 is repeatedly displayed if normal.
If faulty, after displaying the normal code 12 for three
times, the stored diagnosis trouble code (DTC) is dis-
played for three times. Then back to the normal code
again and repeats this display order. Maximum 6 codes
are stored, and these are displayed in the reverse chro-
nological order.
For details concerning DTCs, refer to “List of Diagnostic
Trouble Code (DTC)” described later.

N5A2014E

ABS/ASR 5A4-17

N5A2015E

N5A2016E