Subaru LEGACY 2006 Manual page 509

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Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
2. Judge as NG when the oxygen sensor voltage at recovery from a deceleration fuel cut, is large.
If the fuel cut time in a deceleration fuel cut is long (more than 6 s), and even after recovering from a decel-
eration fuel cut, the oxygen sensor voltage is high (0.55 V or more), judge as NG.
Judgment Value
Malfunction Criteria
Shortest time change from rich (500 mV
O2 output) to lean (300 mV) if voltage
reduces from 550 mV to 250 mV.
Time at over 550 mV
Time Needed for Diagnosis: 1 time
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cy-
cles.
Normality Judgment
1. Regardless of a deceleration fuel cut, if the response time (diagnosis value) when the oxygen sensor
voltage has changed from rich to lean is shorter than the threshold value (judgment value), judge as a normal
condition.
Response time (diagnosis value) ≤ threshold value → normal
2. Do not judge as a normal condition.
Judge as OK when the criteria below are met.
Judgment Value
Malfunction Criteria
Shortest time change from rich (500 mV
O2 output) to lean (300 mV) if voltage
reduces from 550 mV to 250 mV.
6. DTC CLEAR CONDITION
• When the OK idling cycle is completed 40 times in a row
• When "Clear Memory" is performed
7. MALFUNCTION INDICATOR LIGHT CLEAR CONDITION
• When the OK driving cycle is completed 3 times in a row
• When "Clear Memory" is performed
8. FAIL SAFE
Sub feedback control: Not allowed.
9. ECM OPERATION AT DTC SETTING
• Memorize the freeze frame data. (For test mode $02)
• Memorize the diagnostic value and trouble standard value. (For test mode $06)
10.ENABLE CONDITION
Lean → rich response diagnosis
Secondary Parameters
Battery voltage
A/F main feedback control condition
Deceleration fuel cut ≥ 6 seconds
After fuel cut
11.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.)
Threshold Value
> 327 milliseconds
> 2 sec.
Threshold Value
≤ 327 milliseconds
Enable Conditions
> 10.9 V
Completed
Experienced
≥ 2 sec.
GD(H4SO)-72