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Home >> Subaru >> 2017 >> Forester 2.0XT Touring >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 17 (Engine Control System (Diagnostics) (P0171 To P0685) (H4DO)) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P0172 System Too Rich Bank 1 >> Diagnostic Method

Diagnostic Method

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Compare the diagnostic value with the threshold value, and if a condition meeting the malfunction 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 < Value from Map
MAP SPECIFICATION

Warm-up increase compensation coefficient 0.00 0.10 0.20 0.30 0.40 0.47
Threshold Value 0.67-0.00 0 0.67-0.10 2 0.67-0.17 5 0.67-0.23 7 0.67-0.28 9 0.67-0.31 9

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

Malfunction indicator light illumination:  Illuminates as soon as a malfunction occurs.