DR-2A Fault Code 11-Oxygen Solenoid Circuit

1. Connect diagnostic read-out tool to engine harness connector.
2. Open carburetor switch, turn ignition switch in Run position and place Read/Hold switch in hold position.
3. Display Code 55 on read-out tool.
4. Connect a voltmeter between green oxygen solenoid wire at carburetor 6-way connector and ground.
5. Put system in ATM Test Mode 91.
6. If voltmeter pulsates between zero and 1 volt, proceed to Step D.
NOTE: It may be difficult to hear this solenoid. You may want to use a small screwdriver held up against the solenoid to feel it pulsating.
7. If voltmeter is not pulsating but indicates within 1 volt of battery , proceed to Step B.
8. If voltmeter is not pulsating but reads between zero and 1 volt, proceed to Step C.