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Home >> Subaru >> 2018 >> WRX STI >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (Diagnostics) (2 Of 4) (STI) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P0172: System Too Rich Bank 1 >> Diagnostic Method

Diagnostic Method

Compare the diagnostic value with the threshold value, and if a condition meeting the malfunction criteria listed below continues for 10sx3time(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
WARM-UP INCREASE COMPENSATION COEFFICIENT - MAP

Warm-up increase compensation coefficient 0.00 0.10 0.20 0.30
Threshold Value 0.650 0.547 0.476 0.414
Warm-up increase compensation coefficient 0.39 0.50 0.60
Threshold Value 0.360 0.312 0.301

Perform the diagnosis using the threshold value produced by subtraction.

time needed for diagnosis:  10sx3time(s)

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

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