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1985
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Grand Prix LE, 3.8 A
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Cruise Control Systems
Cruise Control Systems
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Description
Operation
Notes
Engagement Switch
"Set/Coast" Switch
"SET" Position
"COAST" Position
"Tap-Down" Position
Electronic Control Module (ECM)
Servo Unit
Notes
Steady Cruise State
Vehicle Losing Speed
Vehicle Gaining Speed
Speed Sensors (Either May Be Used)
Speedometer Mounted with VSS Buffer
Transmission Mounted with VVS Buffer
Electrical & Vacuum Release Switches
Adjustments
Switch & Valve Adjustment
Cable & Servo Adjustment
1.8L, 2.5L, 4.3L (Gasoline), 3.8L (Oldsmobile "A" and "C" Series)
2.8L, Chevrolet 4.3L, 5.0L and 5.7L
Oldsmobile 2.0L and 2.8L, Cavalier 2.8L
Buick & Oldsmobile
3.0L Century, Electra, LeSabre & Regal
3.8L Century
3.8L Regal Turbo
4.3L (VIN V) and 5.7L Diesels
4.3L Diesel (VIN T)
5.0L Parisienne
Trouble Shooting
Cruise System Surges
Cruise Set Speed High Or Low
Excessive Cruise Loss On Hills
"Tap-Up" Or "Tap-Down" Does Not Operate
Testing & Diagnosis
Cruise Control Diagnosis
Servo Test
"Set/Coast" Switch Test
Cruise Control Engagement Switch Test
Cruise Release Switch Test
Speed Sender Test (Speedometer Type)
Speed Sender Test (Pm Generator Type)
Wiring Diagram