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P2148 Fuel Injector Group «A» Supply Voltage Circuit High

General Description

 

Injectors spray fuel in the highly compressed combustion chamber, and power generates through combustion process. Fuel pressure is raised to 1600bar in common rail diesel engine for the purpose of making fuel into minute particles. And fuel devided into minute particles leads smoke reduction, high power generation, and improved fuel efficiency.
Needle valve inside of injector is located between A and B chamber. If applied pressure to B chamber is relived by injector solenoid, niddle valve is raised by the pressure of A chamber then, fuel is injected. If same pressure is applied to A and B chamber, niddle valve closes by the elastic force of spring then, fuel injection stops.
As electronically controlled injector is applied instead of mechanical injector, it becomes possible to control pilot and post injection, injeciton duration and quantity independantly. Therefore engine performance is improved by these control. For more precise correction of fuel injection quantity, inputting C2I data to ECM is required.
【IQA】 During the production process of injectors, it is inevitable for each injector to have different injection characteristic. To cope with the various fuel injection characteristic optimally, NO. which consists with 16 character is given to a certain injector. The composition of NO. corresponds to a certain specific fuel injection characteristic. The characteristic is arleady saved at ECM. Therefore, if the NO. on injectors is inputted to ECM using SCAN TOOL, optimum fuel injection is achieved.

 

DTC Description
P2148 is set when injector power circuit voltage is above 4.8V at IG KEY «ON». This code is due to short to battery in injector power circuit(HIGH side).
DTC Detecting Condition
Item Detecting Condition Possible Cause
Threshold Value
The voltage above 4.8V is detected in injector power circuit. (SC+)
Injector circuit
Injector component
Fail Safe
Fuel injection inhibited.
Fuel return from injector inhibited.
Engine speed is limited to 2000RPM.
Check lamp
ON

 

※ OC (Open Circuit) : Open, SC- (Short Circuit — ) : Short to ground, SC+ (Short Circuit +) : Short to battery

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