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Home >> Subaru >> 2016 >> WRX Premium, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 15 (Diagnostic Trouble Code (DTC) Detecting Criteria) >> Diagnostic Trouble Code (DTC) Detecting Criteria >> DTC P0171 System Too Lean Bank 1 >> Diagnostic Method

Diagnostic Method

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

Compare the diagnostic value (fsobd) with the threshold value, and if a condition meeting the malfunction criteria listed below continues for 10 s X 3 time(s) or more, judge that there is a fault in the fuel system.

JUDGMENT VALUE SPECIFICATION

Malfunction Criteria Threshold Value
fsobd = (sglmd - tglmda) + faf + flaf ≥ Value from Map
In this case: sglmd = measured lambda  
tglmda = target lambda  
faf = main feedback compensation coefficient (every 64 milliseconds)  
flaf = main feedback learning compensation coefficient  
AIR AMOUNT SPECIFICATION - MAP

Amount of air (g (oz)/s) 0(0) 2.34375 (0.08) 4.6875 (0.17) 7.03125 (0.25) 9.375 (0.33) 11.71875 (0.41) 14.0625 (0.5)
fsobdL1 (%) 1.35 1.35 1.35 1.35 1.35 1.35 1.35

Time Needed for Diagnosis:  10 s X 3 time(s)

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