C7.1 Engines and Generator Sets Caterpillar

Injector codes are codes that are 30 hexadecimal characters in length that are supplied with each injector. The code is on a plate on the top of the injector and a card is also included in the packaging for the injector. The code is used by the Electronic Control Module (ECM) to balance the performance of the injectors.

Illustration 1	g02854936
Label with the injector code

Illustration 2	g02132457
Sequence for recording the injector code

The electronic service tool is used to load the injector codes into the ECM.

The injector codes must be loaded into the ECM if any of the following conditions occur:

• An electronic unit injector is replaced.

• The ECM is replaced.

• Diagnostic code 630-2 or 268-2 is active.

• Electronic unit injectors are exchanged between cylinders.

Note: Diagnostic code 630-2 or 268-2 will also become active if the engine serial number, FLS, or FTS are not entered into the ECM.

If the ECM is replaced, the injector codes are normally transferred to the new ECM as part of the "Copy Configuration" procedure. If the "Copy Configuration" procedure fails, the injector codes must be loaded manually.

Installing Injector Codes

Note: The injector code is on the electronic unit injector.

1. Record the injector code for each electronic unit injector.

2. Connect the electronic service tool to the diagnostic connector. Refer to Troubleshooting, "Electronic Service Tools".

3. Turn the keyswitch to the ON position.

4. Select the following menu options on the electronic service tool:

   • Service

   • Calibrations

   • Injector Trim Calibration

5. Select the appropriate cylinder.

6. Click the "Change" button.

7. Input the applicable injector code that was recorded in Test Step 1.

8. Click the "OK" button.

   The injector code is loaded into the ECM.

9. Repeat the procedure for each cylinder, as required.

Exchanging Electronic Unit Injectors

Exchanging electronic unit injectors can help determine if a combustion problem is in the electronic unit injector or in the cylinder. If two electronic unit injectors that are currently installed in the engine are exchanged between cylinders, the injector codes must also be exchanged. Press the "Exchange" button at the bottom of the "Injector Trim Calibration" screen on the electronic service tool. Select the two electronic unit injectors that will be exchanged and press the "OK" button. The tattletale for the electronic unit injectors that were exchanged will increase by one.