Inoperative Cruise Control

Check all items indicated under Erratic Cruise Performance. Unplug terminal connector at transducer, then reconnect, placing White wire into hold terminal and leaving Brown/White wire disconnected. Proceed with testing as follows:

1. Turn ignition switch to "ON" position, depress engagement switch halfway and hold in that position. A "thunk" should be heard indicating transducer is engaging. If no "thunk" is heard, check fuse and brake switch adjustment. Check that transducer circuit between hold terminal and ground reads 4-6 ohms. Check engagement switch. See ELECTRICAL SYSTEM . Check White wire at transducer for battery voltage. If all conditions check good and no "thunk" is heard, replace transducer.
2. With vehicle in "PARK" position, start engine and depress engagement switch halfway. If engine speed does not increase, disconnect orifice tube hose at transducer and plug hose. If engine then accelerates, check voltage at Brown/White striped wire. If 12 volts are indicated, replace transducer if not done previously. If engine speed does not increase when hose is plugged, a vacuum leak or restriction is indicated. Disconnect large hose connected to transducer and check for vacuum at transducer fitting.
   NOTE: Engagement switch should remain depressed to halfway position.
3. If no vacuum is found at transducer fitting, remove engine manifold vacuum supply hose at transducer and check at hose for vacuum. If vacuum is present at hose, replace transducer if not done previously. If vacuum is not present at hose, check vacuum supply hose and vacuum fitting at engine.
4. If vacuum is found at transducer fitting, reinstall large hose to transducer. Remove hose at servo unit and check hose for vacuum while engagement switch is depressed halfway. If vacuum is present, replace servo unit. If no vacuum is present, check hoses and fittings to transducer and then check brake release valve and hose.
5. Replace all vacuum hoses and electrical wires to original locations upon completion of tests.