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

1. -

DTC detecting condition:

Immediately at fault recognition

Wiring diagram:

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

G13629782

Courtesy of SUBARU OF AMERICA, INC.

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 .

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 (E52) No. 1 - (E52) No. 2:
  
  #2 (E52) No. 9 - (E52) No. 10:
  
  #3 (E52) No. 17 - (E52) No. 18:
  
  #4 (E52) No. 25 - (E52) 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 (E52) No. 1 - Engine ground:

#1 (E52) No. 2 - Engine ground:

#2 (E52) No. 9 - Engine ground:

#2 (E52) No. 10 - Engine ground:

#3 (E52) No. 17 - Engine ground:

#3 (E52) No. 18 - Engine ground:

#4 (E52) No. 25 - Engine ground:

#4 (E52) 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 .

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 .