DTC P1261: Cylinder 1 Direct Fuel Injector Circuit/Open: Notes
- -
DTC detecting condition:
Immediately at fault recognition
Wiring diagram:
Engine Electrical System. Ref. to WIRING SYSTEM>ENGINE ELECTRICAL SYSTEM .
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
.
- Turn the ignition switch to OFF.
- Disconnect the connector from ECM.
- Measure the resistance between ECM terminals on faulty fuel injectors.
Connector & 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 & 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 .