Diagnostic Aids
Normal scan voltage varies between .1-1.0 volt (100-999 mV) while in closed loop. Code 13 sets within one minute, if voltage remains between 0-.347 volt, but the system goes into open loop in about 15 seconds. Verify ground connections are clean and tight at terminals D6 and D7. An open circuit in these terminals result in a Code 13. If code is intermittent, see TESTS W/O CODES article.