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Home >> Subaru >> 2021 >> Ascent Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostics) (2 Of 4) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P023F: Fuel Pump Secondary Circuit/Open >> General Description >> Diagnostic Method

Diagnostic Method

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment value

THRESHOLD VALUE SPECIFICATION - DIAGNOSIS 1 (POWER SUPPLY SHORT)

Malfunction Criteria Threshold Value
Terminal voltage 4.1 V or more
THRESHOLD VALUE SPECIFICATION - DIAGNOSIS 2 (GROUND SHORT)

Malfunction Criteria Threshold Value
Terminal voltage 0.8 V or less
THRESHOLD VALUE SPECIFICATION - DIAGNOSIS 3 (OPEN CIRCUIT)

Malfunction Criteria Threshold Value
Fuel pump current 0.5 A or less
THRESHOLD VALUE SPECIFICATION - DIAGNOSIS 4 (SHORT CIRCUIT)

Malfunction Criteria Threshold Value
Time for reaching target current 0.075 ms or less
THRESHOLD VALUE SPECIFICATION - DIAGNOSIS 5 (OVERCURRENT)

Malfunction Criteria Threshold Value
Fuel pump current 22 A or more

Time needed for diagnosis:  TDC x 75 times

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