Equus 3123 - GM Code Reader (1982 - 1995) - Manual (Page 37)

Retrieving ABS Codes
GM 3-12
3.5.3 Kelsey-Hayes 4WAL System Service Codes
Code Service Code Definition
12 System Normal
13 System Normal (2WD)
14 System Normal (4WD/AWD)
15 System Normal (4WD/AWD)
21 Right front wheel sensor fault
22 Missing right front wheel sensor signal
23 Erratic right front speed sensor
25 Left front speed sensor fault
26 Missing left front speed signal
27 Erratic left front speed sensor
28 Simultaneous loss of both front sensor signals
29 Simultaneous drop out of all 4 sensors
31 Right rear speed sensor fault
32 Missing right rear speed signal
33 Erratic right rear speed sensor
35 Left rear speed sensor fault or VSS circuit open (1993)
36 Missing left rear speed signal or VSS signal missing (1993)
37 Erratic left rear speed signal or erratic VSS signal (1993)
38 Wheel speed error
41 4 Wheel Anti-Lock (4WAL) control unit fault
42 4 Wheel Anti-Lock (4WAL) control unit fault
43 4 Wheel Anti-Lock (4WAL) control unit fault
44 4 Wheel Anti-Lock (4WAL) control unit fault
45 4 Wheel Anti-Lock (4WAL) control unit fault
46 4 Wheel Anti-Lock (4WAL) control unit fault
47 4 Wheel Anti-Lock (4WAL) control unit fault
48 4 Wheel Anti-Lock (4WAL) control unit fault
49 4 Wheel Anti-Lock (4WAL) control unit fault
50 4 Wheel Anti-Lock (4WAL) control unit fault
51 4 Wheel Anti-Lock (4WAL) control unit fault
52 4 Wheel Anti-Lock (4WAL) control unit fault
53 4 Wheel Anti-Lock (4WAL) control unit fault
54 4 Wheel Anti-Lock (4WAL) control unit fault