Subaru IMPREZA GD 2007 Series Manual page 1805

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Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
F: DTC P0031 HO2S HEATER CONTROL CIRCUIT LOW (BANK 1 SENSOR 1)
1. OUTLINE OF DIAGNOSIS
Detect an open or short circuit of the front oxygen (A/F) sensor heater.
The front oxygen (A/F) sensor heater performs duty control, and the output terminal voltage at ON is 0 V, and
the output terminal voltage at OFF is the battery voltage.
Judge as NG when the terminal voltage remains Low.
2. COMPONENT DESCRIPTION
(A)
(B)
0V
(A) Battery voltage
(B) Front oxygen (A/F) sensor heater
output voltage
3. ENABLE CONDITION
Secondary Parameters
Battery voltage
4. GENERAL DRIVING CYCLE
Always perform the diagnosis continuously.
OFF
ON (D)
(C)
(C) 128 milliseconds
Enable Conditions
≥ 10.9 V
GD(H4DOTC)-14
EN-01792
(D) Low error