Subaru IMPREZA GD 2007 Series Manual page 2085

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Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
H: DTC P0037 HO2S HEATER CONTROL CIRCUIT LOW (BANK 1 SENSOR 2)
1. OUTLINE OF DIAGNOSIS
Detect the rear oxygen sensor heater open or short circuit.
The rear 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) Output voltage of the rear oxygen
sensor heater
3. ENABLE CONDITION
Secondary Parameters
Battery voltage
Elapsed time after the engine start
4. GENERAL DRIVING CYCLE
Perform the diagnosis continuously from 1 second after the engine start.
OFF
ON (D)
(C)
(C) 256 milliseconds (cycles)
Enable Conditions
> 10.9 V
≥ 1 second
GD(STI)-18
EN-01792
(D) Low error