Subaru LEGACY 2006 Manual page 500

asieps_tobira.book 63 ページ ２００９年１０月２６日 月曜日 午前９時１６分
Diagnostic Trouble Code (DTC) Detecting Criteria
5. DIAGNOSTIC METHOD
Calculate faf difference every 128 milliseconds, and the λvalue difference. Calculate the diagnostic value af-
ter calculating for 210 seconds.
Judge as NG when the malfunction criteria below are completed. Judge as OK and clear the NG when the
malfunction criteria below are not met.
Judgment Value
Malfunction Criteria
parafca = td2faf/td2lmd
where,
td2faf (N) = td2faf (n–1) + |d2faf (n)|
td2lmd (N) = td2lmd (n–1) + |d2lmd (n)|
add up to a total of 210 seconds
d2faf (n) = (faf (n) – faf (n–1)) – (faf (n–1)
– faf (n–2))
d2lmd (n) = (lmd (n) – lmd (n–1)) – (lmd
(n–1) – lmd (n–2))
faf = main feedback compensation coef-
ficient every 128 milliseconds
lmd = output lambda every 128 millisec-
onds
Time Needed for Diagnosis: 210 seconds
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cy-
cles.
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
• Front oxygen sensor (A/F) sensor main learning compensation: Not allowed to calculate.
• A/F sensor sub learning compensation: Not allowed to calculate.
• Purge control: Not allowed to purge.
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)
Threshold Value
≥ 0.44
GD(H4SO)-63
GENERAL DESCRIPTION