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Home >> Subaru >> 2011 >> Legacy Premium, Automatic CVT >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (Diagnostic Trouble Code (DTC) Detecting Criteria (H4DOTC)) >> 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.

Compare the diagnosed value (fsobd) with the threshold value, and if a condition meeting the malfunction criteria below continues for 10 s x 5 time(s) or more, judge that there is a fault in the fuel system.

JUDGMENT VALUE CHART

Malfunction Criteria Threshold Value
fsobd = (sglmd - tglmda) + faf + flaf
In this case: sglmd = measured lambda
tglmda = target lambda
faf = Main feedback compensation coefficient (every 64 ms)
flaf = main feedback learning compensation coefficient
< Value of Map 2
MAP 2 REFERENCE CHART

Amount of air (g (oz)/s) 0 (0) 2.34375 (0.08) 4.6875 (0.17) 7.03125 (0.25) 9.375 (0.33) 11.7187 5 (0.41) 14.0625 (0.5)
fsobdL1 (%) 0.6 0.6 0.63137 0.68082 0.71025 0.72525 0.73025

Time Needed for Diagnosis:  10 s x 5 time(s)

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

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

JUDGMENT VALUE CHART

Malfunction Criteria Threshold Value
fsobd = (sglmd - tglmda) + faf + flaf ≥ 0.8

Time Needed for Diagnosis:  10 s