Subaru 2009 IMPREZA Service Manual page 1647

Diagnostic Trouble Code (DTC) Detecting Criteria
3. ENABLE CONDITIONS
Rich lean diagnosis response
Secondary Parameters
Battery voltage
A/F main feedback control condition
Deceleration fuel cut time is 5000 ms or
more.
After fuel cut
Current calculation time of the rear oxy-
gen sensor heater
Current continuation time of the rear oxy-
gen sensor heater
Estimated catalyst temperature
Number of deceleration fuel cut
4. GENERAL DRIVING CYCLE
Perform the diagnosis only once when deceleration fuel cut occurs after rapid acceleration. (Pay attention to
the oxygen sensor voltage for the timing of the deceleration.)
Enable Condition
10.9 V
Completed
Experienced
2000 ms
60000 ms
30000 ms
400 °C (752 °F)
1 time(s)
GD(H4DOTC)-59
GENERAL DESCRIPTION