Actron GM Code Scanner CP9001 - Manual (Page 93)

93
ABS Code Meanings: Kelsey-Hayes 4WAL
IMPORTANT: Always follow vehicle service manual procedures for any ABS
repairs! (Manual listings on page 4.)
12
ABS System functional,
2WD, service brake not
applied. This code indicates
that the anti-lock brake
system as installed on a
2
wheel drive vehicle is
functioning normally. As
indicated above, this code
should appear
without the
service brakes applied.
13
ABS System functional,
2WD, service brake applied.
This code indicates that the
anti-lock brake system as
installed on a
2 wheel drive
vehicle is functioning
normally. As indicated above,
this code should appear
with
the service brakes applied. If,
with the service brakes
applied, the anti-lock lamp
continues to indicate a code
12, it is likely that there is a
problem with the stop (brake)
lamp switch circuit.
Assistance is available under
the diagnostic chart for
diagnostic trouble code 81.
14
ABS System functional,
4WD, service brake not
applied. This code indicates
that the anti-lock brake
system as installed on a
4
wheel drive vehicle is
functioning normally. As
indicated above, this code
should appear
without the
service brakes applied.
15
ABS System functional,
4WD, service brake applied.
This code indicates that the
anti-lock brake system as
installed on a
4 wheel drive
vehicle is functioning
normally. As indicated above,
this code should appear
with
the service brakes applied. If,
with the service brakes
applied, the anti-lock lamp
continues to indicate a code
14, it is likely that there is a
problem with the stop (brake)
lamp switch circuit.
Assistance is available under
the diagnostic chart for
diagnostic trouble code 81.
21
Right Front Wheel Speed
Sensor Circuit resistance
is incorrect. This code is
indicative of high resistance
in this particular wheel speed
sensor circuit. The
resistance of the wheel
speed sensor may be out of
specification, or there may
be loose, corroded, or dirty
connections in this circuit.
22
Right Front Wheel Speed
Sensor Voltage Output is
incorrect. This code
indicates a problem in the
wheel speed sensor or its
associated tone (toothed)
wheel. Check for the proper
air gap between the wheel
speed sensor and tone
wheel, missing or broken
teeth on the tone wheel, a
loose, improperly mounted,
or mis-adjusted wheel speed
sensor. An intermittent
connection in the associated
wiring can also set this code.
23
Right Front Wheel Speed
Sensor Voltage Output is
erratic. Erratic voltage output
usually indicates a loose, dirty,
or corroded connection. Check
the connections at the wheel
speed sensor connector, the
wheel speed sensor harness,
and the EHCU (Electro-
Hydraulic Control Unit). There
may also be a problem in the
wheel speed sensor or its
associated tone (toothed)
wheel. Check for the proper air
gap between the wheel speed
sensor and tone wheel,
missing or broken teeth on the
tone wheel, a loose,
improperly mounted, or mis-
adjusted wheel speed sensor.
25
Left Front Wheel Speed
Sensor Circuit resistance is
incorrect. This code is
indicative of high resistance in
this particular wheel speed
sensor circuit. The resistance
of the wheel speed sensor may
be out of specification, or there
may be loose, corroded, or
dirty connections in this circuit.
26
Left Front Wheel Speed
Sensor Voltage Output is
incorrect. This code
indicates a problem in the
wheel speed sensor or its
associated tone (toothed)
wheel. Check for the proper
air gap between the wheel
speed sensor and tone
wheel, missing or broken
teeth on the tone wheel, a
loose, improperly mounted,
or mis-adjusted wheel speed
sensor. An intermittent
connection in the associated
wiring can also set this code.
27
Left Front Wheel Speed
Sensor Voltage Output is
erratic. Erratic voltage output
usually indicates a loose,
dirty, or corroded connection.
Check the connections at the
wheel speed sensor
connector, the wheel speed
sensor harness, and the
EHCU (Electro-Hydraulic
Control Unit). There may also
be a problem in the wheel
speed sensor or its
associated tone (toothed)
wheel. Check for the proper
air gap between the wheel
speed sensor and tone wheel,
missing or broken teeth on
the tone wheel, a loose,
improperly mounted, or mis-
adjusted wheel speed sensor.
28
One or Two Wheel Speed
Sensor Voltage Output
Signals are erratic. Trouble
codes 23, 27, 33, or 37 may
be set along with code 28. If
one or more of these 4
codes are present, use that
code(s) to diagnose the
failure. If trouble code 28 is
the only code set, it is
advisable to drive the vehicle
an additional period of time
until one of the 4 listed
codes does set, and then
use that code chart for
diagnosis. If code 28
persists as the only trouble
code, it indicates that an
intermittent connection
exists somewhere in the
system. All connections will
have to be checked.