General Information

Engine Control
P0271 Cylinder 4 Injector Circuit High - General Information

Component Location





General Description

Injectors jet out high pressure fuel caculated by PCM to each cyliders. Direct and separated injections improve fuel efficiency and engine power.
The IDB(injector driver box) controls injector operation. If the IDB receives signal for injector operation from PCM, IDB boosts the voltage and uses current by voltage difference between HIGH and LOW side of injector circuit as injector operating current.

DTC Description

If there is short to battery in injector #4 High/Low side circuit (IDB ~ injector #4), PCM sets DTC P0271.

DTC Detecting Condition





Specification





Diagnostic Circuit Diagram





Signal Waveform & Data




Fig.1) Normal waveform of Injector High/Low side line at idle.