Subaru 2009 IMPREZA Service Manual page 1648

Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
5. DIAGNOSTIC METHOD
When the oxygen sensor output voltage changes from 0.55 V (rich) to 0.15 V (lean), calculate the minimum
response time for output change between 0.5 V and 0.2 V for the judgement criteria.
Diagnosis execution condition
Rear oxygen sensor (V)
Fuel cut on deceleration
(A) 0.55 V
(D) 0.15 V
(G) Measure the response time.
(A)
(B)
(C)
(D)
(E)
(B) 0.5 V
(E) 0 V
(H) Execute the malfunction judge-
ment in 2000 ms from the recov-
ery of fuel cut on deceleration.
GD(H4DOTC)-60
(G)
(F)
(H)
(C) 0.2 V
(F) More than 5000 ms
EN-05566