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9-6
1977 PONTIAC SERVICE MANUAL
CRUISE CONTROL CONTROLS SPEED 3 OR MORE
M P H ABOVE SELECTED SPEED
CAUSE
CORRECTION
Improper centering spring adjustment.
-
Adjust centering spring (C) (Fig. 9-4)
CRUISE CONTROL CONTROLS SPEED 1 OR MORE
M P H BELOW SELECTED SPEED
CAUSE
CORRECTION
-
- --
Improper centering spring adjustment.
ON-CAR SERVICE
--
-
--
Adjust centering spring (C) (Fig. 9-4).
proper connections of the hoses. They do not show the
physical routings. Removal and replacement of the
The regulator
cannot be overhauled. l t should
engagement switch is covered in the steering section of this
be replaced: Proper diagnosis procedures, as listed above in
Fig. 9- 1, should prevent unnecessary replacement of the
regulator. Refer to Figs. 9-5 through 9-7 for regulator and
vacuum servo mounting. Engagement switch wire routing
through the steering column is shown in Figs. 9-8 and 9-9,
and underdash wiring is shown in Fig. 9-10. Vacuum hose
schematics are shown in Figs. 9-21 and 9-22, and show the
CRUISE CONTROL TEST PROCEDURE
ROAD TEST AS FOLLOWS:
1. ON A LEVEL ROAD, DRIVE AT A STEADY
SPEED OF
55
M.P.H.
2. PUSH AND RELEASE ENGAGE BUTTON.
RELEASE ACCELERATOR PEDAL AFTER
A 2
-
3
SEC. DELAY. CRUISE CONTROL
SHOULD
E+
GAGE AND CRUISE AT
56 M.P.H.
3
M.P.H.
3.
PUSH AND HOLD ENGAGE BUTTON AT FULL
TRAVEL. CRUISE CONTROL MUST RELEASE
THROTTLE, ALLOWING CAR TO DECELERATE.
RELEASE BUTTON SLOWLY. CRUISE CONTROL
SHOULD RE-ENGAGE.
4. SLOWLY DEPRESS BRAKE PEDAL. CRUISE
CONTROL MUST RELEASE THROTTLE PRIOR
TO BRAKE ENGAGEMENT.
IN THE EVENT THAT THE LIMIT IN STEP 2 IS EXCEEDED,
AN ALLEN WRENCH ADJUSTMENT IS PROVIDED ON THE
REGULATOR ASSEMBLY (SEE ILLUSTRATION). THIS
ADJUSTMENT SCREW IS MARKED "C" AND IS LOCATED
NEXT TO THE ELECTRICAL TERMINALS WITH "F" (FAST)
AND "S'(SL0W) ARROWS INDICATING CLOCKWISE
ROTATION TO BRING CRUISE SPEED DOWN TO ENGAGE
SPEED AND COUNTERCLOCKWISE ROTATION TO BRING
CRUISE SPEED UP TO ENGAGE SPEED. THE REQUIRED
ADJUSTMENT SCREW
ADJUSTMENT WILL USUALLY BE 118 OF A TURN OR LESS.
REGULATOR ASSEMBLY
2519
Fig. 9-4
Cruise Control Regulator Test Procedure
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