ENGINE AR-COMPLETE 3974079 - Caterpillar

Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Caterpillar Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Caterpillar products.Dispose of all fluids according to local regulations and mandates.
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
The Electronic Control Module (ECM) contains no moving parts. Replacement of the ECM can be costly. Replacement can also be a time consuming task. Follow the troubleshooting procedures in this manual in order to ensure that replacing the ECM will correct the problem. Use these procedures to ensure that the ECM is the cause of the problem.Note: Ensure that the ECM is receiving power and that the ECM is properly wired to the negative battery circuit before you attempt to replace the ECM. Refer to Troubleshooting, "Electrical Power Supply - Test".Some application software supports the use of a new ECM as a test ECM. A new ECM can be temporarily placed into a "Test ECM Mode". This ECM can then be used to replace a suspect ECM in order to determine if the suspect ECM is faulty. Refer to Troubleshooting, "Test ECM Mode".
If the flash file and engine application are not matched, engine damage may result.
Perform the following procedure in order to replace the ECM:
Print the parameters from the "Configuration" screen on Caterpillar Electronic Technician (ET). If a printer is unavailable, record all of the parameters. Record any logged diagnostic codes and logged event codes for your records. Record the injector serial numbers from the "Calibrations" screen under the "Service" menu on Cat ET. Note: The injector serial numbers and the injector confirmation code are necessary for obtaining the correct injector trim files. The injector serial number and the injector confirmation code are located on the injector. The ECM uses the injector trim files in order to compensate for manufacturing variations between individual injectors. If you replace any of the unit injectors, you must reprogram the injector trim files for the new injectors. Also, if you replace the ECM, the injector trim files must be installed into the new ECM. A successful "Copy Configuration" process will accomplish this task. For more instruction, refer to Troubleshooting, "Injector Trim File - Install".
Use the "Copy Configuration/ECM Replacement" feature that is found under the "Service" menu on Cat ET. Select "Load from ECM" in order to copy the configuration from the suspect ECM. Note: If the "Copy Configuration" process fails and the parameters were not obtained in Step 1, the parameters must be obtained elsewhere. Some parameters are stamped on the engine information plate, but most parameters must be obtained from the factory.
Remove the ECM from the engine.
Remove the electrical power from the ECM.
Disconnect the J1/P1 and J2/P2 ECM connectors.
Use a suitable container to catch any fuel that