Diagnostic Method
When TWC performance falls, OSC performance also falls. In the diagnosis, malfunction will be detected with estimation of OSC performance by observing the time and air amount, etc. until the rear oxygen sensor voltage starts to rise after more than predetermined time of deceleration fuel cut has passed.
JUDGMENT VALUE SPECIFICATION
| Malfunction Criteria | Threshold Value |
|---|---|
| Oxygen Storage Capacity (OSC) of Catalytic | < 0.35g(0.01oz) |
Time needed for diagnosis: Less than 1 second
Malfunction indicator light illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.