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Home >> Subaru >> 2019 >> WRX STI Limited >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Engine Control System (Diagnostics) (Except For STI) (3 Of 4)) >> Diagnostic Procedure With Diagnostic Trouble Code (DTC) >> DTC P1261: Cylinder 1 Direct Fuel Injector Circuit/Open >> Outline Of Diagnosis

Outline Of Diagnosis

WARNING: This page is about a different variant/trim than selected.

Detect the malfunction of fuel injector circuit function.

Judge as NG when ECM detects any malfunction in the diagnostic items listed below.

Diagnostic item Malfunction Criteria
Power supply short ECM low side terminal voltage of the fuel injector circuit is high.
Ground short ECM low side terminal voltage of the fuel injector circuit is low.
Open circuit Fuel injector current is low.
Overcurrent Fuel injector current is high.
Short circuit The time when the fuel injector current reaches the target current is short.