Conditions For Setting DTC
Following conditions must be met for DTC diagnostic test to run:
- No MAP sensor, IAT sensor, ECT sensor, TPS sensor, CKP sensor, EGR sensor, EVAP, fuel trim, fuel injector or misfire DTCs are set.
- Engine is in closed loop mode.
- Engine coolant temperature is 140°F (60°C) or more.
- While in power enrichment mode oxygen sensor voltage remains below 400 mV for 3 seconds.
- Commanded air flow ratio is less than 3 seconds.