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Home >> Subaru >> 2006 >> Legacy GT spec.B >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 15 (Diagnostic Trouble Code (DTC) Detecting Criteria (H4SO)) >> Diagnostic Trouble Code (DTC) Detecting Criteria >> DTC P0172 System Too Rich (Bank 1) >> Diagnostic Method

Diagnostic Method

WARNING: This page is about a different variant/trim than selected.

Abnormality Judgment 

Compare the diagnosed value (fsobd) with the threshold value, and if a condition where the malfunction criteria below are met continues for more than 50 seconds, judge that there is a fault in the fuel system.

Judgment Value 

JUDGMENT VALUE CHART

Malfunction Criteria Threshold Value
fsobd = (sglmd - tglmda) + fan + flaf ≤ fsobdR1
where, See MAP REFERENCE 
sglmd = measured lambda fsobdR1 = rich side threshold value of fsobd
tglmda = target lambda  
fan = main feedback compensation coefficient every 64 milliseconds  
flaf = main feedback learning compensation coefficient  

Map 4 Threshold value for fuel system malfunction criteria 

MAP REFERENCE

Amount of air (g(oz)/s) 0 (0) 3.2 (0.113) 6.4 (0.226) 9.6 (0.339) 12.8 (0.451) 11.7 (0.413) 19.2 (0.677)
fsobdR1 (%) -40 -40 -33.2 -26.5 -26.5 -26.5 -26.5

Time Needed for Diagnosis:  10 seconds x 5 times

Malfunction Indicator Light Illumination:  Illuminates when malfunction occurs in 2 continuous driving cycles.

Normality Judgment 

Judge as OK when the malfunction criteria below continues for 10 seconds.

Judgment Value 

JUDGMENT VALUE CHART

Malfunction Criteria Threshold Value
fsobd = (sglmd - tglmda) + fan + flat ≥ -20%