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Home >> Subaru >> 2021 >> Forester Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostics) (3 Of 4) >> Diagnostic Procedure With Diagnostic Trouble Code (DTC) >> DTC P1261: Cylinder 1 Direct Fuel Injector 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 SPECIFICATION (DIAGNOSIS 1)

Malfunction Criteria Threshold Value
Operating current 0.2 A or less
JUDGMENT VALUE SPECIFICATION (DIAGNOSIS 2)

Malfunction Criteria Threshold Value
Operating current 32.4 A or more
JUDGMENT VALUE SPECIFICATION (DIAGNOSIS 3)

Malfunction Criteria Threshold Value
Terminal voltage 1 V or less
JUDGMENT VALUE SPECIFICATION (DIAGNOSIS 4)

Malfunction Criteria Threshold Value
Terminal voltage 5 V or more
JUDGMENT VALUE SPECIFICATION (DIAGNOSIS 5)

Malfunction Criteria Threshold Value
Injector control voltage Less than 3.92 V
JUDGMENT VALUE SPECIFICATION (DIAGNOSIS 6)

Malfunction Criteria Threshold Value
Injector control voltage 3.92 V or more

Time needed for diagnosis: 

Diagnosis 1, 2, 5: Mapl

Diagnosis 3, 4, 6: Map2

MAP SPECIFICATION 1

Engine speed (rpm) 500 2000 4000
Time when calculation was performed 10 times (sec) 2.4 0.6 0.3
MAP SPECIFICATION 2

Engine speed (rpm) 0 500 2000 4000
Time when calculation was performed 10 times (sec) 0.04 2.4 0.6 0.3

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