Injector Trim Calibration using Caterpillar ET Software

Injector Trim Calibration

Figure 1.1 - Injector Trim Files

Whenever an Injector is replaced, it has to be trimmed. Trimming the Injector allows the Engine to comply with local EPA emissions regulations. The Injector Trim Calibration allows the Injector trim code information to be programmed into the ECM. After the Injector is calibrated, it is checked to ensure its validity.

To run the Injector Trim Calibration:
1). Connect CAT ET to the Service Tool connector. Read More: How to Connecting Caterpillar ET Software to the ECM.

2). Select Calibrations from the Service menu.
Figure 1.2 - Calibrations (Service)

3). Select Injector Trim Calibration from the submenu.
Figure 1.3 - Injector Trim Calibration (1)

4). Click Start. The Injector Trim Calibration screen is displayed.
Figure 1.4 - Injector Trim Calibration (2)

#Screen Layout
The Injector Trim Calibration screen has the following areas:
A. Display Area
The Injector Trim Calibration display area has three columns:
  • Injector – Lists the available Injectors.
  • Serial Number – Provides the serial number corresponding to each Cylinder.
  • File Version – Displays the Injector Trim File version currently programmed into the ECM for the injector.
For some products, a Tattletale column is displayed after the File Version column. Tattletales represent the number of times the Injector's Injector Trim File has been changed.
B. Buttons
The buttons available in the Injector Codes Calibration screen are:
  • Change
  • Exchange
Note: For some products, the electronic exchanging of Injectors functionality is not supported; therefore the Exchange button does not display.

#To program an Injector:
(1). Change
a). Highlight an injector and click Change. The Open dialog box is displayed.
→Note: The Open dialog box points to the file location that was set in the Directories tab in the Preferences dialog box.
→Select the Injector Trim File for the highlighted injector and click Open.
Figure 1.5 - Injector Trim File (Open)
Note: An Injector Trim File cannot be selected for more than one Injector.
b). Click Open. An Warning message Are you sure... dialog box is displayed.
Figure 1.6 - Warning!
c). Click Yes. As the Injector is programmed, a progress bar is displayed. When the programming for the selected Injector is complete, the Injector Trim Successfully Programmed message box is displayed.
Figure 1.7 - Injector Trim successfully programmed
d). Click OK. The Injector Trim Calibration screen is displayed.
Note: If the wrong confirmation code is entered, the Injector will not be programmed.

(2). Exchange
The Exchange button allows the trim information between two Injectors to be electronically exchanged for diagnostic purposes.
Note: For some products, the Exchange button is not supported and will not be displayed.

#To exchange two Injectors:
a). Click the Exchange button. The Injector Exchange dialog box is displayed.
Figure 1.8 - Injector Exchange
b). Select the first Injector of the exchange from the Exchange Injector drop-down list.
Note: The number of the Injector that was highlighted in the Injector Trim Calibration screen automatically displays in the Exchange Injector text box.
c). Select the second Injector of the exchange from the With Injector drop-down list.
d). Click OK. The Please wait… message is displayed. When the exchange is complete, the Injector Exchange is Complete message box is displayed.
Figure 1.9 - Injector Exchange is Complete
e). Click OK. The Injector Trim Calibration screen is displayed with an increased tattletale count of the two Injectors that were exchanged.

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