Monitor Description
OUTLINE OF DIAGNOSIS
Detect the open or short circuit in the air fuel ratio sensor heater.
Judge as NG, when the element voltage is out of the specified range.
COMPONENT DESCRIPTION
| *A | Battery voltage | *B | Air fuel ratio sensor heater output voltage |
| *C | Low error | - | - |
EXECUTION CONDITION
| Secondary parameters | Execution condition |
|---|---|
| Battery voltage | 10.9 V or higher |
| Air fuel ratio sensor heater control duty | Less than 87.5% |
GENERAL DRIVING CYCLE
Always perform the diagnosis continuously.
DIAGNOSTIC METHOD
If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.
Judgment value
| Malfunction Criteria | Threshold Value |
|---|---|
| Output voltage | 1.9 V or less |
Time needed for diagnosis
1 s
Malfunction indicator light illumination
Illuminates as soon as a malfunction occurs.