Due to tolerances when manufacturing the injectors the injected fuel quantity may deviate between the actual and calculated fuel quantity. After manufacture these deviations are determined for every injector and a calibration value is determined, the value is converted to a code that is stamped on the injectors. This code is programmed in the engine control unit for each cylinder. Using these codes, the engine control unit corrects the calculated fuel quantity individually for each cylinder and thus improves engine operation and exhaust emissions. With this function, new calibration values can be entered in the engine control unit when replacing injectors or engine control unit.
Injector data is found on the injector, see figure. It consists of 16 characters (numbers and letters).
Note:
The injectors are numbered in firing order and not according to cylinder order, see figure.
Injector 1 (cylinder 1)
Injector 2 (cylinder 3)
Injector 3 (cylinder 4)
Injector 4 (cylinder 2)
Injector data
Cylinder number
Test conditions:
Ignition on, engine off.
Procedure:
Start the function.
Follow instructions.
The function is done.
If the function fails, check the test conditions and repair any faults.