General Information

P0261 Cylinder 1 Injector Circuit Low

General Information

Component Location





General Description

Electronically controlled fuel injector is a solenoid valve which supplies exactly calculated amount of fuel to engine for optimum combustion under various engine load and speed. To meet air-fuel ratio required in system, ECM regulates fuel injection quantity as controlling injector solenoid operating duration referring air flow to cylinders and output signals from HO2S. For this precise control, quick response of solenoid is required and for perfect combustion, injection characteristic is important.

DTC Description

If there is Short to ground in injector #1 circuit, ECM sets DTC P0261.

DTC Detecting Condition





Specification





Diagnostic Circuit Diagram





Signal Waveform & Data




When the ECM energizes the injector by grounding the control circuit, the circuit voltage should below (theoretically 0 V) and the fuel is injected. When the ECM de-energizes the injector by opening control circuit, the fuel injector is closed and circuit voltage should be peak for a moment.