DR-6C Oxygen Feedback System For A Rich Condition

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, then remove air cleaner cover and close down the choke blade.
4. If voltmeter indicates a decrease toward zero volts, proceed to Step 18.
5. If voltmeter reads no decrease, locate and repair open sensor wire.
6. If there no open circuit, replace oxygen sensor.