Injector Classification: Notes

Fig 1: Injector Classification Markings

Courtesy of CHRYSLER LLC

1 - ELECTRICAL CONNECTOR

2 - SIX-DIGIT ALPHANUMERIC CODE

NOTE: Fuel Injectors have different flow rates. When ALL injectors are removed, re-enter all injector six digit codes. If more than one injector is replaced, remove the injector sticker on the front of the timing cover.

Classified injectors can be recognized by the six digit alpha-numeric code (2) on the magnetic head. The code corresponds to the classification stage. The classification stage may be checked against the fuel injector identification sticker (1) on the front of the timing cover. Number one cylinder will be the first six digits, number two cylinder will be the second six digits, and so on. See Fig 1 and Fig 2.

Fig 2: Engine And Fuel Injector Identification Labels

Courtesy of CHRYSLER LLC

1 - FUEL INJECTOR LABEL

2 - MANUFACTURES USAGE

3 - ENGINE IDENTIFICATION LABEL

The classification of injectors describes the fuel flow quantity characteristic of the injector. This will make it possible in the future to match the engine software to the tolerances of the injector within a more narrowly graduated range. Classification can be clearly recognized, and assigned only by means of a scan tool.

These general conditions equally apply if, as a result of replacing an engine, carrying out repairs to the cylinder head etc, the cylinder selective assignment of the injectors or the engine control module assignment may have changed. If proper attention is not paid to the classification on these vehicles driveability and smoking concerns could result.

If an injector is replaced, it is then necessary to assign the classification code to the corresponding cylinder in the engine control module with the appropriate scan tool.