Subaru Impreza 2005 General Description Manual page 15

Diagnostic Trouble Code (DTC) Detecting Criteria
E: DTC P0032 HO2S HEATER CONTROL CIRCUIT HIGH (BANK 1 SENSOR 1)
1. OUTLINE OF DIAGNOSIS
Detect the open or short circuit of heater.
The heater conducts the duty control. The output terminal voltage at ON becomes 0 V, and the output termi-
nal voltage at OFF becomes battery voltage.
Judge NG when the terminal voltage remains to be High.
2. COMPONENT DESCRIPTION
(A)
(B)
0V
(A) Battery voltage
(B) Front oxygen (A/F) sensor heater output voltage
(C) 128 milliseconds
(D) High abnormality
3. ENABLE CONDITION
Secondary Parameters
Battery voltage
4. GENERAL DRIVING CYCLE
Always perform diagnosis continuously.
5. DIAGNOSTIC METHOD
• Abnormality Judgment
Judge NG when the continuous time of completing the malfunction criteria below becomes 1 second (8 cy-
cles).
Judgment Value
Malfunction Criteria
Output voltage level
Front oxygen (A/F) sensor heater control
duty
Time Needed for Diagnosis: 1 second
Malfunction Indicator Light Illumination: Illuminates as soon as malfunction occurs.
(D) OFF
ON
Enable Conditions
≥ 10.9 V
Threshold Value
High
≥ 12.5%
GD(STi)-15
(C)
GENERAL DESCRIPTION
EN-01793