DTC P1261: Cylinder 1 Direct Fuel Injector Circuit/Open: Notes

DTC detecting condition:

Immediately at fault recognition

CAUTION: Use the check board when measuring the ECM terminal voltage and resistance. Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>GENERAL DESCRIPTION>PREPARATION TOOL>HOW TO USE CHECK BOARD .

NOTE: After the faulty parts are repaired or replaced, perform the final check in Basic Diagnostic Procedure. Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>BASIC DIAGNOSTIC PROCEDURE>PROCEDURE .

Wiring diagram:

Engine Electrical System Ref. to WIRING SYSTEM>ENGINE ELECTRICAL SYSTEM .

G13202458

Courtesy of SUBARU OF AMERICA, INC.

CHECK HARNESS BETWEEN ECM AND FUEL INJECTOR CONNECTOR.
1. Turn the ignition switch to OFF.
2. Disconnect the connector from ECM.
3. Measure the resistance between ECM terminals on faulty fuel injectors.
  Connector and terminal.
  
  #1 (E159) No. 1 - (E159) No. 2:
  
  #2 (E159) No. 9 - (E159) No. 10:
  
  #3 (E159) No. 17 - (E159) No. 18:
  
  #4 (E159) No. 25 - (E159) No. 26:
Is the resistance 1.5 Ω (at 23°C (73°F))?

Yes : Go to 2.

No : Go to 3.
CHECK HARNESS BETWEEN ECM AND FUEL INJECTOR CONNECTOR.
Measure the resistance between ECM and engine ground on faulty injectors.

Connector and terminal.

#1 (E159) No. 1 - Engine ground:

#1 (E159) No. 2 - Engine ground:

#2 (E159) No. 9 - Engine ground:

#2 (E159) No. 10 - Engine ground:

#3 (E159) No. 17 - Engine ground:

#3 (E159) No. 18 - Engine ground:

#4 (E159) No. 25 - Engine ground:

#4 (E159) No. 26 - Engine ground:

Is the resistance 1 MΩ or more?

Yes : Repair the poor contact of ECM connector.

No : Go to 3.
CHECK FUEL INJECTOR.
Check the fuel injector on faulty cylinder. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DOTC)>FUEL INJECTOR>INSPECTION .

Is the check result OK?

Yes : Repair the open or ground short circuit in harness between ECM connector and fuel injector connector.

No : Replace the faulty fuel injector. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DOTC)>FUEL INJECTOR .