The ECM determines if a front HO2S heater fault has occurred and sets DTC P0030 if the front HO2S heater control driver inside the ECM fails, if HO2S is not operational (after an elapse of predetermined time) since engine start, or when the front HO2S tip temperature is out of normal operation range.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Heater circuit monitoring | 1. Poor connector connection 2. Faulty related fuse 3. Open/short in power circuit 4. Faulty upstream O2 Sensor |
Enable Condition |
•
10 sec. elapsed after upstream dew point end detected | |
Threshold Value |
•
Heater control circuit open | |
Diagnosis Time |
•
Continuous | |
MIL ON Condition |
•
3 driving cycles |
