Diagnostic Method

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

JUDGMENT VALUE CHART

Malfunction Criteria	Threshold Value
Battery voltage	≥ 10.9 V
Time of heater control duty at 70 % or more	≥ 30000 ms
Front oxygen (A/F) sensor impedance.	> 500 Ω

Time Needed for Diagnosis: 5000 ms

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.

JUDGMENT VALUE CHART

Malfunction Criteria	Threshold Value
Battery voltage	≥ 10.9 V
Front oxygen (A/F) sensor impedance.	≤ 500 Ω

Time Needed for Diagnosis: Less than 1 second