Subaru 2009 IMPREZA Service Manual page 1606

Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
G: DTC P0032 HO2S HEATER CONTROL CIRCUIT HIGH (BANK 1 SENSOR 1)
1. OUTLINE OF DIAGNOSIS
Detect front oxygen (A/F) sensor heater open or short circuit.
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 High.
2. COMPONENT DESCRIPTION
(A)
(B)
0V
(A) Battery voltage
(D) High error
3. ENABLE CONDITIONS
Secondary Parameters
Battery voltage
4. GENERAL DRIVING CYCLE
Always perform the diagnosis continuously.
(D) OFF
ON
(C)
(B) Front oxygen (A/F) sensor heater
output voltage
Enable Condition
10.9 V
GD(H4DOTC)-18
(C) 128 milliseconds
EN-01793