DR-6B Checking Oxygen Sensor

1. Connect voltmeter to oxygen solenoid green wire, then disconnect hose at computer and plug.
2. Applied 14 inches of vacuum to computer, then connect tachometer to engine and raise speed to 2000 RPM.
3. Reconnect oxygen test connector waiting for system to start.
4. If voltmeter is pulsating between 7 and 14 volts, proceed to Step C.
5. If voltmeter indicates below 7 volts, proceed to Step D.