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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 2371-07-03-01 Injectors from the Calibrate tab in
Premium Tech Tool (PTT).

2. Select Option A, Manual Entry, then click the Continue button.

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NOTE: Option A should be used for this procedure only. Option B, Trim
Code Entry Via Scanner, should be used for all instances where the trim
codes must be copied from the injector tags to PTT.
3. 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.

4. From the Trim Code entry screen in PTT, highlight the first trim code.
Hold the Ctrl key and press the C key to copy the trim code. PTT will not
allow copying via right-click.

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5. 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.

6. Repeat steps 4 and 5 for all six trim codes.
7. When all trim codes have been copied from PTT, press the Continue
button to complete the operation. DO NOT PRESS THE PLAY BUTTON
TO PROGRAM.

Select Okay when prompted for the Test Result. Click Continue again to
exit the operation.

8. Proceed with programming the new EMS and transferring parameters
as necessary.
9. When programming is complete, return to the Calibrate tab and run

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Operation 2371-07-03-01 Injectors again.

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10. 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.
11. 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.

12. Delete the entry for the corresponding cylinder in PTT.
13. Make sure the cursor is blinking in the now-blank entry field for the
correct cylinder, then hold the Ctrl key and press the V key to paste the
trim code copied from the word document back into PTT.

14. 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.
15. Repeat steps 11-14 for the remaining Trim Codes.

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16. Press the Play button to update the trim code values and complete
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the operation.

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