DTC P1261: Cylinder 1 Direct Fuel Injector Circuit/Open: Notes
DTC detecting condition:
Immediately at fault recognition
- After servicing or replacing faulty parts, perform Clear Memory Mode Ref. to ENGINE (DIAGNOSTICS) (EXCEPT FOR STI)>Clear Memory Mode>OPERATION , and inspection mode Ref. to ENGINE (DIAGNOSTICS) (EXCEPT FOR STI)>Inspection Mode>PROCEDURE .
- Use the check board when measuring the ECM terminal voltage and resistance.
Wiring diagram:
Engine Electrical System Ref. to WIRING SYSTEM>Engine Electrical System>WIRING DIAGRAM .
- CHECK HARNESS BETWEEN ECM AND FUEL INJECTOR CONNECTOR
.
- Turn the ignition switch to OFF.
- Disconnect the connector from ECM.
- Measure the resistance between ECM terminals on faulty fuel injectors.
Connector & terminal
#1 (E158) No. 11 - (E158) No. 12:
#2 (E158) No. 23 - (E158) No. 24:
#3 (E158) No. 35 - (E158) No. 36:
#4 (E158) No. 47 - (E158) No. 48:
Is resistance 1.89 - 2.31 Ω at 20°C (68°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 & terminal
#1 (E158) No. 12 - Engine ground:
#1 (E158) No. 11 - Engine ground:
#2 (E158) No. 24 - Engine ground:
#2 (E158) No. 23 - Engine ground:
#3 (E158) No. 36 - Engine ground:
#3 (E158) No. 35 - Engine ground:
#4 (E158) No. 48 - Engine ground:
#4 (E158) No. 47 - 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) (EXCEPT FOR STI)>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) (EXCEPT FOR STI)>Fuel Injector .