Pontiac FIREBIRD 1972 Service Manual page 1433

15-18 1972 PONTIAC SERVICE MANUAL
CRUISE CONTROL TEST PROCEDURE
ROAD OR ROLL TEST AS FOLLOWS.
1. DRIVE AT SPEED OF 50 M.P.H.
2. CHECK ENGAGE AND CRUISE:
PUSH ENGAGE BUTTON APPROX.
1 / 2
TRAVEL
CRUISE CONTROL SHOULD ENGAGE AT 50 M.P.H.
t
1 M.P.H.
3. CHECK ENGAGE BUTTON DISENGAGE:
PUSH BUTTON TO FULL TRAVEL AND ALLOW CAR TO DROP
TO 40 M.P.H. AND RELEASE BUTTON SLOWLY. CRUISE
CONTROL SHOULD LOCK I N AT 40 M.P.H.
4. CHECK FOR THROTTLE RELEASE:
SLOWLY DEPRESS BRAKE PEDAL. THROTTLE RELEASE
MUST BE ACHIEVED PRIOR TO BRAKE ENGAGEMENT
I N THE EVENT THAT LIMITS I N STEP 2 ABOVE ARE EXCEEDED,
AN ALLEN WRENCH ADJUSTMENT IS PROVIDED ON THE REGULATOR
ASSEMBLY. (SEE ILLUSTRATION) THIS ADJUSTMENT SCREW IS
LOCATED NEXT TO THE ELECTRICAL TERMINALS AND IS MARKED
"C" WITH "F" (FAST) AND "S" (SLOW) ARROWS INDICATING
CLOCKWISE ROTATION TO BRING CONTROL SPEED DOWN TO
ENGAGE SPEED AND COUNTERCLOCKWISE ROTATION TO BRING
CONTROL SPEED UP TO ENGAGE SPEED.
f
ADJUSTMENT SCREW
F i g . 1 5 - 1 3
C r u i s e C o n t r o l R e g u l a t o r A d j u s t m e n t
CRUISE CONTROL
ADJUST REGULATOR (Fig. 15-13)
SERVICE PROCEDURES
1. If Cruise Control holds speed three or more mph
higher than selected speed, turn centering spring ad-
justing screw (C) clockwise 1/8" turn or less.
2. If Cruise Control holds speed three or more mph
below selected speed, turn centering spring adjusting
screw (C) counterclockwise 1/8" turn or less.
ADJUST BRAKE RELEASE SWITCH (Figs. 15-14
and 15-1 5)
Apply brake pedal and push both switches forward as far
as possible. Pull pedal forcibly rearward to adjust swit-
ches.
CHECKING FOR DAMAGED CABLES AND GEARS
1. Raise rear of car and place on jack stands.
2. Start engine and move transmission shift lever to
"Drive" range.
3. Remove input cable at regulator to determine if cable
from transmission to regulator is turning. If cable is
not turning, check for broken cable or stripped trans-
mission speedometer gear.
4. If input cable is turning and speedometer was inoper-
ative, cable to speedometer or regulator transfer gear
is broken.
REGULATOR
REMOVE AND REPLACE (Figs. 15-16 and 15-17)
1. Disconnect vacuum hoses and electrical connector.
2. Disconnect both speedometer cables.
3. Remove screws holding regulator to fender skirt and
remove regulator.
4. To replace, reverse above steps.