General Information

Engine Control
P0271 Cylinder 4 Injector Circuit High - General Information

Component Location





General Description

Based on information from various sensors, the PCM measures the fuel injection amount. The fuel injector is a solenoid-operated valve and the fuel injection amount is controlled by length of time the fuel injector is held open. The PCM controls each injector by grounding the control circuit. When the PCM energizes the injector by grounding the control circuit, the circuit voltage should be low (theoretically 0V) and the fuel is injected. When the PCM de-energizes the injector by opening control circuit, the fuel injector is closed and circuit voltage should momentarily peak.

DTC Description

PCM sets DTC P0271 if the PCM detects that injector (Cylinder #4) control circuit is open or shorted to battery voltage.

DTC Detecting Condition





Specification





Diagnostic Circuit Diagram