Actron GM Code Scanner CP9001 - Manual (Page 90)

90
SYSTEM 8: Kelsey-Hayes
4WAL
(4 Wheel Anti-Lock)
1990 Astro, Safari
1991 Astro, Bravada, S & T Series Blazer, Jimmy,
Pickup, Safari, Sonoma, Syclone, Typhoon
1992 Astro, Bravada, C & K Series Blazer & Pickup,
S & T Series Blazer, Jimmy, Pickup, Safari, Sierra,
Sonoma, Suburban, Syclone, Typhoon, Yukon
1993 Astro, Bravada, C & K Series Blazer & Pickup,
G Series Van,
S & T Series Blazer, Jimmy, Pickup, Safari, Sierra,
Sonoma, Suburban, Syclone, Typhoon, Yukon
1994 Astro, Bravada, C & K Series Blazer & Pickup,
G Series Van,
S & T Series Blazer, Jimmy, Pickup, Safari, Sierra,
Sonoma, Suburban, Yukon
Diagnostic Circuit Check
Complete all steps before reading
trouble codes!
1) Block the wheels, and release the
parking brake. Do not step on the
service brake!
2) Turn the ignition key to the ON
position, but do not start the engine.
Observe the instrument panel
amber anti-
lock light:
• If the anti-
lock light
turns ON,
and then
OFF after about 2 seconds, the
diagnostic circuit check is
successful. Proceed to Step 3.
• If the anti-lock light turns ON and
stays ON, or turns ON after the
bulb check, proceed to the
diagnostic procedure outlined in
your vehicle service manual for the
anti-lock light ON symptom.
• If the anti-lock light stays OFF,
proceed to the diagnostic
procedure outlined in your vehicle
service manual for the anti-lock
light OFF symptom.
3) Turn the ignition
key to the OFF
position. Proceed
to READING
ABS CODES,
page 89. OF
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