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Injectors spray specific amount of fuel which is determined by ECM into the combustion chamber as transforming liquid fuel into fog state. Power generates through combustion process of injected fuel.

The goal of increasing fuel presssure of common rail diesel engine to 1500bar is to transform liquid fuel into fog state. and foggy fuel can decrease exhaust gas and increase power generation of engine and fuel-efficiency. Oil pressure servotype is applied to control 1500bar with solenoid. Injector solenoid operates by current control as raising solenoid operating voltage to 80V. When injector solenoid releases oil pressure of B chamberamong the high pressure loaded to both chambers of needle valve inside of injector, needle valve is lifted by oil pressure and fuel isinjected. When the same intensity of oil pressure is applied to A and B chamber, needle valve is closed by spring tension and fuel injection is cut.

With not applying mechanical injectors but electronically controlled injectors, pilot injection and post injection, injection time and quantity can be controlled independantly. Thus, electronically controlled injectors improve engine performance.

P0266 is set when 1) the current below 3.0A is detected for more than 0.3 sec. in each injector operating condition. or 2) injector nozzle is not closed correctly.(when injector closing time delays. ) This code is due to open in injector circuit.

Electrical systems consist of a lot of harness and connectors, poor connection of terminals can cause various problems and damge of component.

Perform checking procedure as follows.

Check damage of harness and terminals : Check terminals for contact resistance, corrosion and deformation.

Check connecting condition of ECM and component connector : Check terminal seperation, damage of locking device and connecting condition between terminal and wiring

Is the problem found?

? Repair the trouble causing part and go to "Verification of Vehicle Repair"

? Go to "Power Circuit Inspection"

Check open in power circuit

Ignition "OFF", Turn engine "OFF".

Disconnect injector connector(C324-1,2,3,4) and ECM connector(C333-2)

Check continuity between Injector connector terminal 2 and ECM connector terminal 36(No.1,4 cylinder) or 37(No.2,3 cylinder)

Is the measured resistance within the specification?

? Go to "Control Circuit Inspection"

? Repair open spots and go to "Verification of Vehicle Repair"

Check open in control circuit

Ignition "OFF", Turn engine "OFF".

Disconnect injector connector(C324-1,2,3,4) and ECM connector(C333-2)

Check continuity between injector connector terminal 1 and ECM connector 33(NO.1 cylinder), or 40(NO.2 cylinder), or 39(NO.3 cylinder), or 38(NO.4 cylinder)

Is the measured resistance within the specification?

? Go to "Component Inspection"

? Repair open spots and go to "Verification of Vehicle Repair"

Check injector component resistance

Ignition "OFF", Turn engine "OFF".

Disconnect injector connector

Measure the resistance between injector component terminal 1 and 2

Is the measured resistance within the specification?

? Go to "Verification of Vehicle Repair"

? Replace injector and go to "Verification of Vehicle Repair"

Check injector using injector test mode of scantool

Ignition "OFF", Turn engine "OFF".

Connect scantool to Data Link Cable (DLC).

Ignition "ON", Turn engine "ON".

Warm engine up to normal operating temperature.

Select 07. ENGINE TEST FUNCTION on scantool.

Perform 01.COMPRESSTION TEST and 02. IDLE SPEED COMPARISON according to TEST procedure suggested on scantool.

Regard the results of these tests in diagnostic result

Perform 03. INJECT QUANTITY COMPARISON test.

Are RPM and fuel correction quantity at certain cylinder is different from the other's a lot?

? Mount the injector whose correction quantity is very different from another's on another cylinder and if same correction quantity is detect, replace injector and go to "Verification of Vehicle Repair"

? Go to "Verification of Vehicle Repair"

? This test is not absolute standard to check failure of injectors, regard this as a reference value when engine stall occurs.

After a repair, it is essential to verify that the fault is corrected.

After connecting scantool select "Diagnostic Trouble Codes(DTCs)" mode to and then clear DTC.

Drive the vehicle within DTC Enable conditions in General information.

After selecting "Diagnostic Trouble Codes(DTCs)" mode and check DTC is recorded again.

Are any DTCs recorded ?

? Go to the DTC guide of recorded No. in scantool.

? System operates within specification.