IMPELLER 1539123 - Caterpillar

Electronic control modules contain no moving parts. Replacement of an Electronic Control Module (ECM) can consume much time. Before you replace an ECM, follow the troubleshooting procedures in this manual in order to be sure that replacement of the ECM will correct the problem.Note: Electronic control modules should not be interchanged in order to determine if an ECM is faulty. If electronic control modules are interchanged, all of the configuration data for each ECM must be transferred into the Caterpillar Electronic Technician (ET). The appropriate configuration data must then be re-entered into the appropriate ECM. Failure to program each ECM correctly may result in improper engine operation.Verify that the suspect ECM is the cause of the problem. Install a test ECM in place of the suspect ECM. Transfer the software from the suspect ECM to the test ECM. Program all the parameters for the test ECM in order to match the parameters of the suspect ECM. The parameters must match. Refer to the following test steps for details on programming the parameters.If the test ECM resolves the problem, reconnect the suspect ECM. Verify that the problem recurs. If the problem recurs, replace the suspect ECM with the test ECM.Note: If the parameters cannot be read from the suspect ECM, the parameters must be obtained from records or from the factory.Perform the following procedure to replace the ECM.
Use the "Service/Copy Configuration/ECM Replacement" function of the Caterpillar Electronic Technician (ET).Save the file. You can select "Load from ECM". You may also select the "Print" function in order to obtain a paper copy of the parameter settings.Note: Before you replace an ECM, record all of the logged events.
Connect the Cat ET with the communications adapter. Select "Service/Copy Configuration/ECM Replacement" from the drop-down menu on Cat ET.Cat ET will load the configuration parameters and the monitoring system parameters of the suspect ECM.
Select "Load from ECM" in the lower left corner of the Cat ET screen. Select the suspect ECM and select "OK".After the loading is complete, the Cat ET will display this message: "The data has been successfully loaded from the ECM". Select "OK".
Select "File/Disconnect F8" from the drop-down menu.Note: Do not terminate the Cat ET.
Replace the ECM.Note: This procedure describes replacement of the master ECM. Replacement of other electronic control modules is similar.
Set the engine control to the OFF/RESET mode.
Remove the electrical power from the engine.
Illustration 1 g01302679
Typical terminal box (1) Connector (2) Connector (3) Mounting nut
Use a 4 mm allen wrench to disconnect connectors (1) and (2) .
Remove mounting nuts (3) .Note: Rubber grommets behind the ECM are held in place by the mounting studs. The grommets help to reduce vibration. The grommets may fall when the ECM is removed. Be sure not to lose the grommets.
Remove the ECM from the terminal box.
Install the replacement ECM.
Use the mounting hardware to install the new ECM. Use a mounting nut to fasten the ground strap for the ECM to the upper left mounting stud. Then install the other three mounting nuts.Check the mounting