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1978-79 Volkswagen

  1. Disconnect plug from intake air sensor. Connect an ohmmeter between air sensor terminals No. 36 and 39. See Figure. Operate air sensor flap by hand. With flap closed there should be no continuity. When flap is opened slightly, there should be continuity. If not, replace intake air sensor.
  2. To check potentiometer, connect an ohmmeter to terminals No. 6 and 9 of intake air sensor. Resistance should be between 200-400 ohms (100-300 ohms on Type 2). Now, connect ohmmeter between terminals No. 7 and 8. Reading should be between 100-500 ohms (80-200 ohms on Type 2). If readings are not within specifications, replace intake air sensor.
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