STANDARD (0) 9N3051 - Caterpillar

Injector Trim File
The injector trim file is an electronic file that contains information about the injector. The injector trim file allows the Electronic Control Module (ECM) to compensate for the variations between injectors. The ECM on an ACERT engine must have the correct injector trim file for each injector that is installed on the engine. Otherwise, engine performance and emissions will be degraded. Injector trim files are available via SIS Web. Injector trim files must be programmed into the ECM for any of the following circumstances:
An injector is replaced.
Injectors are exchanged between cylinders.
The ECM is replaced.Caterpillar Electronic Technician (ET)
Injector trim files are loaded into the ECM with Cat ET. Cat ET also provides the following services in order to help manage injector trim files:"Injector Exchange" - This service simplifies exchanging injector trim files between cylinders. To access this service, select the "Service" menu. Then select "Calibrations". Select "Injector Trim Calibration". Select two injectors and click the "Exchange" button."Copy Configuration" - This service is used during replacement of an ECM. All of the injector trim files are copied from the ECM. Then, all of the injector trim files can be quickly loaded into a replacement ECM.Explanation of the Numbers on the Injector
Illustration 1 g01162754
Typical example of the locations of the numbers on a older Hydraulic Electronic Unit Injector (HEUI) (1) Serial number location (2) Injector trim code location (3) Part number location
Illustration 2 g02037553
Typical example of the locations of the numbers on a newer Hydraulic Electronic Unit Injector (HEUI) (4) Injector trim code location (5) Part number location (6) Serial number location
Illustration 3 g02038953
Typical example of the locations of the numbers on a Mechanical Electronic Unit Injector (MEUI) (7) Serial number location (8) Injector trim code location (9) Part number locationSerial Number - The serial number can be up to 14 digits in length.Trim Code - The trim code is four digits. The trim code is only required for on-highway engines.Part Number - The part number is seven digits.Downloading Injector Trim Files from SIS Web
Click on "Service Software Files" on SIS Web. Select "Injector Trim Files". Enter the serial number of the injector into the search field. Download the injector trim file to the PC.Loading an Injector Trim File Into the ECM
Establish communication between Cat ET and the ECM.
Select the following menu options on Cat ET:
"Service"
"Calibrations"
"Injector Trim Calibration"
Select the appropriate cylinder.
Click the "Change" button.
Select the appropriate injector trim file from the PC.
Click the "Open" button.
Click the "OK" button.
Repeat the procedure for each new injector, as required.