ECM controls injection amount and injection timing through Electrical control injector in order to control system pressure which is required for measuring and injection of diesel fuel. Injectors on CRDi injects atomized fuel with highly pressurized directly into the combustion chamber corresponding to fuel amount ECM decided. Fuel injected into combustion chamber generates power through the explosion.
There are 2 different fuel injection on the S engine. One is 2 time pilot injection for reducing explosion noise during fuel control, another is main injection for generating power. In addition, those are controlled independently by ECM and injection time (injection amount) as well. Injector is newly adopted new technology. that are hydraulic coupler which transfer operating force of actuator as quickly as possible and PIEZO actuator what is operating response better than solenoid actuator. Both PIEZO actuator and hydraulic coupler realized to increase the fuel pressure to 250 ~ 1600bar. That makes high combustion efficiency resulting to reduced smog and improved engine power and fuel efficiency.
DTC P0270 is set when short to ground is detected in "High side" circuit or "Low side" circuit of injector #1at injection condition. This code is due to short to ground in injector #1circuit / injector component. ECM detects failure as charging time of injector #1circuit.
?P0264 is faulty of injector #2 circuit, P0267 is faulty of #3, P0270 is faulty of #4, P0273 is faulty of #5, P0276 is faulty of #6.
Item
Detecting Condition
Possible Cause
DTC Strategy
? Current Monitoring
? Injector circuit
? Injector component
Enable Conditions
? IG key ON
Threshold Value
? Short to ground in High side circuit.
? Short to ground in Low side circuit.
Diagnostic Time
? Immediately
Fail Safe
Fuel cut
YES
? MIL is blinking if no IQA inputted.
EGR Off
NO
Fuel Limit
Check Lamp
ON
Control Type
Component Resistance
Operating Voltage
PIEZO voltage control
150 ~250 kO (20?)
100V ~ 200V (100V ~ 140V at 250bar)