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Home >> Toyota >> 1979 >> Corolla Base, 2D Hatchback, Standard Trans >> Repair and Diagnosis >> Engine Mechanical >> Fuel System >> Deceleration Fuel Cut System >> Testing >> Deceleration Fuel Cut System >> 1978-79 Models

1978-79 Models

  1. Start engine and pinch vacuum hose from carburetor to vacuum switch. Increase engine speed to 2800-3000 RPM. Engine should misfire slightly at this level.
  2. Release hose and raise engine speed. Engine should run smoothly. Unplug solenoid valve connector. Engine should run rough. If engine responds as indicated, system is operating normally.
  3. If not, remove solenoid valve and apply 12 volts to connector. As source voltage is applied, solenoid will "click" if it is operating properly.
  4. Disconnect vacuum switch. Check continuity between switch terminal and body. With engine off, there should be continuity. With engine on, there should be no continuity.
Fig 1: 1977 Deceleration Fuel Cut System Test
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