DR-26A Oxygen Sensor Operation

*** UPDATED BY TSB #18-62-86

1. Connect diagnostic read-out tool to engine test connector. Ensure read/hold switch is in Read position.
2. Start engine and wait two minutes, then place read/hold switch in Hold position.
3. If display on read-out tool is switching between 0 and 1, proceed to Test 27.
4. If display on read-out tool is 0, check for a engine vacuum leak, check for a grounded oxygen sensor wire or check for a plugged fuel injector.
5. If display on read-out tool is 1, preceed to Step B.