Monitor Description
OUTLINE OF DIAGNOSIS
Detect the open circuit in the air fuel ratio sensor.
Judge as NG when the impedance of the element is large.
COMPONENT DESCRIPTION
| *A | Electromotive force | *B | Air fuel ratio |
| *C | Rich | *D | Lean |
| *1 | Exhaust gas | *2 | Zirconia element oxygen |
EXECUTION CONDITION
| Secondary parameters | Execution condition |
|---|---|
| Battery voltage | 10.9 V or higher |
| (Air fuel ratio sensor heater control duty ratio) | 70% or more |
| (Air fuel ratio sensor heater control time) | 36000 ms or more |
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 |
|---|---|
| Air fuel ratio sensor impedance | More than 450 Ω |
Time needed for diagnosis
5000 ms
Malfunction indicator light illumination
Illuminates as soon as a malfunction occurs.