The PCM determines if a front HO2S heater fault has occurred and sets DTC P0030 if the front HO2S heater control driver inside the PCM 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 working range.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
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Evaluate Upstream O2 Sensor Heater performance | 1. Poor Connector Connection 2. Defected related fuse 3. Open/Short in Power Circuit 4. Defected Upstream O2 Sensor |
Enable Conditions |
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Engine speed during engine start higher than 640 RPM to 960 RPM depending on start ECT
•
Heater Pulse Width Modulation(PWM) higher than 1.56%
•
Upstream O2 sensor pre-heating phase finished
•
Upstream O2 sensor operative readiness detected; [Upstream O2 sensor tip Temp. higher than 1,184℉(640℃) or 18 sec. elasped after dew-point exceeded]
•
Battery voltage higher than 11 V and lower than 16 V
•
No relevant DTC present | |
Threshold Value |
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Upstream O2 sensor tip Temp. lower than 1,391℉(755℃)
•
Upstream O2 sensor tip Temp. higher than 1,652℉(900℃) | |
Diagnostic Time |
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O2 sensor tip Temp. less than 1,184℉(660℃) : 1 sec.
•
O2 sensor tip Temp. higher than 1,184℉(660℃) and less than 1,391℉(755℃) : 10 sec.
•
O2 sensor tip Temp. higher than 1,652℉(900℃) : 10 sec. | |
Mil On Condition |
•
2 Driving Cycle |
