Subaru 2009 IMPREZA Service Manual page 1644

Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
3. ENABLE CONDITION
Used for abnormality judgement
Secondary Parameters
High
Secondary air system
Closed loop control at the oxygen sensor
Misfire detection every 200 rotations
Front oxygen (A/F) sensor compensation coefficient Not in limit value
Battery voltage
Engine coolant temperature
Low (1)
Secondary air system
Closed loop control at the oxygen sensor
Misfire detection every 200 rotations
Front oxygen (A/F) sensor compensation coefficient Not in limit value
Battery voltage
Engine coolant temperature
Amount of intake air
Low (2)
Secondary air system
Closed loop control at the oxygen sensor
Misfire detection every 200 rotations
Front oxygen (A/F) sensor compensation coefficient Not in limit value
Battery voltage
Engine coolant temperature
Amount of intake air
Current continuation time of the rear oxygen sensor
heater
Low (3)
Secondary air system
Closed loop control at the oxygen sensor
Misfire detection every 200 rotations
Front oxygen (A/F) sensor compensation coefficient Not in limit value
Battery voltage
Engine coolant temperature
Amount of intake air
Current continuation time of the rear oxygen sensor
heater
Fuel cut
Used for normality judgement
Secondary Parameters
Secondary air system
Closed loop control at the oxygen sensor
Misfire detection every 200 rotations
Front oxygen (A/F) sensor compensation coefficient Not in limit value
Battery voltage
Engine coolant temperature
4. GENERAL DRIVING CYCLE
After starting the engine, continuously perform the diagnosis with the same engine condition.
Enable Condition
Not in operation
In operation
< 5 time(s)
10.9 V
70 °C (158 °F)
Not in operation
In operation
< 5 time(s)
10.9 V
70 °C (158 °F)
10 g/s (0.35 oz/s)
Not in operation
In operation
< 5 time(s)
10.9 V
70 °C (158 °F)
< 10 g/s (0.35 oz/s)
25000 ms
Not in operation
In operation
< 5 time(s)
10.9 V
70 °C (158 °F)
< 10 g/s (0.35 oz/s)
25000 ms
Experienced
Enable Condition
Not in operation
In operation
< 5 time(s)
10.9 V
70 °C (158 °F)
GD(H4DOTC)-56