Monitor Description
OUTLINE OF DIAGNOSIS
Detect functional errors of the air fuel ratio sensor heater.
Judge as NG when it is determined that the air fuel ratio sensor impedance is large when looking at engine status such as deceleration fuel cut.
COMPONENT DESCRIPTION
| *1 | Element cover (outer) | *2 | Element cover (inner) |
| *3 | Sensor element | *4 | Sensor housing |
EXECUTION CONDITION
| Secondary parameters | Execution condition |
|---|---|
| Battery voltage | 10.9 V or higher |
| (Air fuel ratio sensor heater control duty duration) | More than 15% 25000 ms or more |
| Elapsed time after returning from the fuel cut | 20000 ms or more |
GENERAL DRIVING CYCLE
Perform the diagnosis continuously when 20000 ms have elapsed since the fuel cut was initiated after starting the heater control.
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 75 Ω |
Time needed for diagnosis
10000 ms
Malfunction indicator light illumination
Illuminates when malfunction occurs in 2 continuous driving cycles.