Equus 3123 - GM Code Reader (1982 - 1995) User Manual
Page 38
3
3-13
GM
3.5.4 Bosch 2S System Service Codes
Code
Service Code Definition
55
4 Wheel Anti-Lock (4WAL) control unit fault
56
4 Wheel Anti-Lock (4WAL) control unit fault
57
4 Wheel Anti-Lock (4WAL) control unit fault
58
4 Wheel Anti-Lock (4WAL) control unit fault
59
4 Wheel Anti-Lock (4WAL) control unit fault
60
4 Wheel Anti-Lock (4WAL) control unit fault
61
4 Wheel Anti-Lock (4WAL) control unit fault
62
4 Wheel Anti-Lock (4WAL) control unit fault
63
4 Wheel Anti-Lock (4WAL) control unit fault
64
4 Wheel Anti-Lock (4WAL) control unit fault
65
4 Wheel Anti-Lock (4WAL) control unit fault
66
4 Wheel Anti-Lock (4WAL) control unit fault
67
Open motor circuit or shorted ECU output
68
Locked motor or shorted motor circuit
71
4 Wheel Anti-Lock (4WAL) control unit fault
72
4 Wheel Anti-Lock (4WAL) control unit fault
73
4 Wheel Anti-Lock (4WAL) control unit fault
74
4 Wheel Anti-Lock (4WAL) control unit fault
81
Brake switch circuit shorted or open
85
Open anti-lock warning lamp
86
Shorted anti-lock warning lamp
88
Shorted brake warning lamp
Code
Service Code Definition
12
Diagnostic system operational
21
Right front speed sensor fault
22
Right front toothed wheel frequency error
25
Left front speed sensor fault
26
Left front toothed wheel frequency error
31
Right rear speed sensor fault
32
Right rear toothed wheel frequency error
35
Left rear speed sensor fault
36
Left rear toothed wheel frequency error