Subaru LEGACY 2006 Manual page 453

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Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
F: DTC P0037 HO2S HEATER CONTROL CIRCUIT LOW (BANK 1 SENSOR 2)
1. OUTLINE OF DIAGNOSIS
Detect oxygen sensor heater open or short circuit.
The oxygen 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) Rear oxygen sensor heater output
voltage
3. ENABLE CONDITION
Secondary Parameters
Battery voltage
Elapsed time after engine starting
4. GENERAL DRIVING CYCLE
Perform the diagnosis continuously after starting the engine.
OFF
ON (D)
(C)
(C) 256 milliseconds (cycles)
Enable Conditions
> 10.9 V
≥ 1 sec.
GD(H4SO)-16
EN-01792
(D) Low error