Diagnostic Aids

A malfunction in the HO2S heater circuit will set DTC. Check circuit for intermittent open or faulty connectors. Oxygen supply inside HO2S is provided through the wires.

Use of FREEZE FRAME and/or FAILURE RECORDS mode will aid in locating intermittent condition. If DTC cannot be duplicated, information in data can be useful in determining how many miles since the DTC set. This mode can also be used to determine how many ignition cycles the diagnostic reported a pass and/or fail condition. Operating the vehicle within the FREEZE FRAME conditions (RPM, load, vehicle speed, temperature, etc.) will isolate when DTC failed.