4.
Select "Engine test function" on the scantool.
ECM compensates the fuel quantity of injector for maintaining balance between cylinders. This test of scantool is used for checking the fuel quantity compensation of injector. ECM calculates the number of revolution in each cylinder by using CKPS signal. This test result is very comprehensive and includes variation of injection quantity, engine hardware (compression pressure, intake/exhaust valve...etc) and so on. Refer to the test result for inspection of engine hesitation.
IG KEY "ON", ENGINE "ON".
Connect scantool to Data Link Connector (DLC).
Allow the engine to warm up to normal operating temperature. (above 80℃)
Select "Engine test function" on the scantool.
Information of ECM version and function available or not is displayed as blow. Press "ENTER" key.
Select "03.Injection quantity comparison" on the scantool.
Set the test condition as blow screen and Press "ENTER" key.
The test result (rpm data) of each cylinder is displayed on the scantool.
Cylinder engine speed (rpm) and injection quantity (㎣) is displayed.
Press "AVG" key after pressing "ANAL" key.
In case of cylinder that causes engine hesitation, injection quantity(㎣) data is "-6" or "+6". Engine speed would be balanced by ECM in the specific limit. This result means that compensation of injection quantity controlled by ECM goes beyond the limit below 1,500 rpm.(Engine hesitation occurs at idle.)
You can not draw a conclusion that the cause of engine hesitation is "the injector" from first test.
If same data is displayed in the second test after cleaning nozzle of injectors, change the injector position. Inspect the data on the scantool whether it is same or not in the same cylinder position after changing injector.
"Injector Nozzle Cleaning" of "Details Inspection(Equipment Setting)" reference
Case 1 : In case that injection quantity data is displayed "-6" or "+6" and engine speed (rpm) is not similar after cleaning nozzles and changing injector position.
Replace the Injector.
Case 2 : In case that injection quantity data is displayed within "± 4" and engine speed (rpm) is similar after cleaning nozzles and changing injector position.
Reuse the Injector.
