| Main Action |
|
- Poor contact of connector
- O2 Sensor (Up)
|
| Case 1 |
Prerequisite Condition |
- Upstream O2 sensor operative readiness is detected
- Downstream O2 sensor operative readiness is detected
- Active Test is not activated
- Catalyst purge after fuel cut off is not active
- The engine speed is higher than 600 RPM
- Mass air flow is less than 83 g/sec
- The exhaust gas temp. is between 572°F (300°C) and 1472°F (800°C)
- Stable driving conditions
|
| Threshold Value |
- The Upstream Lambda (lean) is greater than 1.1 and the downstream O2 signal voltage is greater than 0.75V (rich)
|
| Diagnostic Time |
- 5 to 100 sec. depending on intake air mass
|
| Case 2 |
Prerequisite Condition |
- Fuel cut off is not active
- Full load not is active with accelerator pedal value lower than 90%
- The exhaust gas temp. is lower than 1760°F (960°C)
- The battery voltage is between 10 and 16V
|
| Threshold Value |
- The lambda value is greater than 0.9 when the lambda set-point is 0.8
|
| Diagnostic Time |
- 10 sec. after the lambda value is set
|
| MIL |
|