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Home >> Subaru >> 2018 >> WRX Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostics) (2 Of 4) (Except For 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 criteria continues for 10 s x 3 times 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 0.39 0.50 0.60 0.64
Threshold Value 0.650 0.539 0.452 0.383 0.307 0.254 0.211 0.194

Time needed for diagnosis:  10 s x 3 times

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

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