| (Case1) |
DTC Strategy |
- Signal Plausibility with Rich Mixture (During Catalyst Purge after Fuel Cut Off)
|
- Open in signal harness
- Open in ground harness
- Contact resistance in connectors
- Faulty Heated O2 Sensor (HO2S)
|
| Enable Conditions |
- Coolant Temperature > 70°C(158°F)
- Sensor preheating and full heating phases finished
- Integrated MAF in last fuel cut-off > 18g
- Sensor signal at End of Last Fuel cut-off < 0.2V
- Intergrated Air Mass Flow after Fuel Cut-Off > 1000g
- Maximum Upstream O2 Sensor Voltage during Catalyst Purge > 0.7V
- Catalyst Temperature Model > 350°C(662°F)
|
| Threshold Value |
- Max Downstream O2 sensor voltage during Catalyst purge after fuel cut-off < 0.55V
|
| Diagnostic Time |
- 2 Valid Fuel Cut Off by Catalyst Enrichment
|
| (Case2) |
DTC Strategy |
- Sensor voltage excursion for Lean and Rich mixture
|
| Enable Conditions |
|
| Threshold Value |
- Time to closed loop control not activated when O2 sensor voltage blocked between 0.37~0.54V > 90~200 sec. (depends on coolant temp. at start)
|
| Diagnostic Time |
|
| MIL On Condition |
|