C4.4 and C6.6 Industrial Engines and Engines for Caterpillar Built Machines Caterpillar

The electronic unit injector is no longer capable of delivering the correct amount of fuel.

System Response:

If equipped, the warning light will come on. The Electronic Control Module (ECM) will log the diagnostic code.

The engine will be derated.

Use the electronic service tool to perform the Fuel System Verification Test. If the diagnostic code is still active, do the following procedure.

Replace the suspect electronic unit injector. Refer to Disassembly and Assembly, "Electronic Unit Injector - Remove" and Disassembly and Assembly, "Electronic Unit Injector - Install".

Use the electronic service tool to perform the Fuel System Verification Test.

Test Step 1. Perform the following diagnostic procedure: None

Results:

• OK - STOP