OM647 and OM612 injector classification - is it optional?

[jdcaples]

In another thread, I saw someone recommend moving injector number 4 to a different cylinder to figure out if a problem followed the injector or the wiring.

There was no mention of injector classification. There was no mention of swapping injectors with the same injector classification identifier.

I was wonderng if injector classification is more "optional" in OM612s and OM647 Sprinters than my interpretation of the service manual on injector classification lead me to suspect.

In other words, can you just drop an injector into any OM647 or OM612 cylinder and go about your business w/o bothering with this classification procedure?


-Jon


From section 14 of a copy of the 2005 Dodge service manual PDF.

STANDARD PROCEDURE - INJECTOR
CLASSIFICATION

The classification of injectors into 3 classes
describes the 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 DRBIII.


Classified injectors can be recognized by the part
number and identification on the magnetic head (circle
with a number between 1 and 3 inside) (Fig. 9).

The number corresponds to the classification stage.
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 number to the corresponding
cylinder with the DRBIII in the control module.

​

INJECTOR CLASSIFICATION PROCEDURE

(1) Turn ignition switch “ON”.
(2) Using a DRB III and select ENGINE then
MISCELLANEOUS.
(3) Select LEARN INJECTORS.
(4) Using the up and down arrows, scroll to the
appropriate injector.
(5) Using the right and left arrows, set injector to
proper classification.
(6) Once injectors are classified, cycle ignition to
complete.

 

[djc126]

Hi. I'm told that OM612 and OM647 each use a specific injector. So they are not swappable.

Some people under the DAD thread commented on not being able to code in their replacement injectors because some specific injector classification codes were non-existent in the DAD software.

So were they able to get replacement injector working?

Regards,

 

[abittenbinder]

Hi. I'm told that OM612 and OM647 each use a specific injector. So they are not swappable.

Some people under the DAD thread commented on not being able to code in their replacement injectors because some specific injector classification codes were non-existent in the DAD software.

So were they able to get replacement injector working?

Regards,

In spite of what the factory workshop manual says, THERE IS NO injector coding for the 612 engine.

The 647 does have an elaborate coding of injectors. The DAD uses an older format of coding which may have been used in some '04 models

Many '04 647's will not respond to injector coding with the DRBIII.

I have seen numerous 647 vehicles with no programmed coding, presumably for the factory.

I code 647 replacement injectors. It's not always successful on '04s and regardless of year I have not seen a dramatic difference pre and post coding. I have heard second party anecdotal info of improved running after coding. Doktor A

 

[WAYNERODD]

The reason why I told him to swap out injector #4 was only to prove out if it was the injector or the wiring.

Alot of times in the past if I was looking to prove a injector problem. I have stuck a OM612 injector in a OM647. And yes they work although I have never left one in the engine.

Most of this was done before I was able to check them.

Thanks to Doktor A, I now have DAD to help me find problems!

 

[jdcaples]

In spite of what the factory workshop manual says, THERE IS NO injector coding for the 612 engine.

The 647 does have an elaborate coding of injectors. The DAD uses an older format of coding which may have been used in some '04 models

Many '04 647's will not respond to injector coding with the DRBIII.

I have seen numerous 647 vehicles with no programmed coding, presumably for the factory.

I code 647 replacement injectors. It's not always successful on '04s and regardless of year I have not seen a dramatic difference pre and post coding. I have heard second party anecdotal info of improved running after coding. Doktor A

The reason why I told him to swap out injector #4 was only to prove out if it was the injector or the wiring.

Alot of times in the past if I was looking to prove a injector problem. I have stuck a OM612 injector in a OM647. And yes they work although I have never left one in the engine.

Most of this was done before I was able to check them.

Thanks to Doktor A, I now have DAD to help me find problems!

I think the answer's evident. I'm closing this thread. Thanks!

-Jon