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6/30/22, 2:21 PM
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New Trim Codes May Need To Be Reprogrammed
Following Engine Replacement With 7/8 Reman Or
Complete (Engine With Both New Injectors And
Engine Control Module); Possible Uneven
Operation/Rough Running At Idle Following EMS
Programming With Data Transfe
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Internal Content
Overview
When a 7/8 engine is assembled, the Engine Control Module is
programmed with certain parameters prior to shipping. Because
injectors are pre-installed, the injector Trim Codes are entered prior to
shipping the engine to the service location. Injector Trim Codes are
parameters that are tranferred from one EMS to another during
programming. If the new EMS is reprogrammed by connecting to the old
module so customer parameters are loaded, the Trim Codes in the new
module will also be overwritten with the codes from the old module.
Repair
Prior to performing any programming operations, the Trim Codes from
the new module can be copied out, then re-entered after programming
is completed.
1. Run Operation 1700-22-03-03 - Parameter, Programming from the
Program tab in Premium Tech Tool (PTT).
2. Ensure the preconditions specified in the warning window are met and
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press the Play button when the test screen opens.
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There will be a second set of preconditions that need to be verified after
the button is pressed.
3. Parameters can be viewed by Group or by Module (MID). Make sure
that the All Parameters button is selected so Trim Code parameters are
visible.
Parameters by Group
Parameters by MID
All of the following screenshots were captured using MID view. There
is no difference in procedure between the two views.
4. Open a blank word processing document. All Windows computers
have Notepad installed, and it is used in this example. Microsoft Word,
Sticky Notes, or any other similar program can also be used.
- To keep track of the correct Trim Code for each cylinder, it is suggested
that the codes be numbered as they are transferred.
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5. From the Parameter list, highlight the first Trim Code. Right-click and
select Copy. PTT will not allow copying via keyboard shortcut (Ctrl-C).
6. Switch to the word document. Right-click and select Paste from the
menu, or hold the Ctrl key and press the V key to paste the information.
7. Repeat steps 4 and 5 for all six Trim Codes.
8. When all Trim Codes have been copied from PTT, press the Stop
button to complete the operation, then click the Exit button . IF
PROMPTED TO PROGRAM, DECLINE AT THIS TIME.
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9. Proceed with programming the new EMS and transferring parameters
as necessary.
10. When programming is complete, return to the Calibrate tab and run
Operation 1700-22-03-03 - Parameter, Programming again.
11. Compare the Trim Codes currently shown in PTT to the codes copied
to the word document.
- If the codes are the same: It is not necessary to perform any further
operations.
- If the codes are different: The set of codes copied to the word
document will need to be returned to PTT. Continue with steps below.
12. Highlight one Trim Code in the word processing document. Right-click
the selection and select Copy, or hold the Ctrl key and press the C key to
copy the Trim Code.
13. Delete the entry for the corresponding cylinder in PTT.
14. Make sure the cursor is blinking in the now-blank entry field for the
correct cylinder, right-click in the entry field and select Paste to reenter the Trim Code copied from the word document back into PTT.
15. Ensure that there are no blank spaces before or after the Trim Code
once it is pasted to PTT. If there are blank spaces, some of the copied
digits may be cut off from the end of the entry. Verify the complete code
is present in the entry field.
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16. Repeat steps 12-15 for the remaining Trim Codes.
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17. Press the Play button to update the Trim Code values and complete
the operation.
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