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Home >> Subaru >> 2019 >> Forester Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostics) (2 Of 4) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P0172: System Too Rich Bank 1 >> General Description >> Diagnostic Method

Diagnostic Method

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

JUDGMENT VALUE SPECIFICATION

Malfunction Criteria Threshold Value
Offset amount of main feedback compensation Less than value of Map
COMPENSATION COEFFICIENT DESCRIPTION - MAP

Warm-up increase compensation coefficient 0.000 0.100 0.200 0.300 0.400 0.416
Threshold Value 0.65 0.56 0.48 0.42 0.36 0.35

Time needed for diagnosis:  10s x 3time(s)

Malfunction indicator light illumination:  Illuminates when malfunction occurs in 2 continuous driving cycles.

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