CORE AS-OIL COOLER 2W8655 - Caterpillar

The Electronic Control Module (ECM) contains no moving parts. Replacement of an ECM can be costly. Before you replace an ECM, follow the troubleshooting procedures in this manual in order to ensure that replacement of the ECM will correct the problem.Verify that the suspect ECM is the cause of the problem. Ensure that all of the parameters for the new ECM match the parameters of the suspect ECM. All of the parameters for the new ECM must match the parameters from the suspect ECM. Refer to the following test steps for details that relate to programming the ECM:If the new ECM resolves the problem, reconnect the suspect ECM. Verify that the problem recurs. If the problem recurs, permanently replace the suspect ECM with the new 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 Caterpillar Electronic Technician (ET). Save the file. Select the "Load from ECM" function from the drop-down menu in Cat ET. 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 communications adapter and the personal computer to the suspect ECM. Establish communications with the ECM. 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 a dialog box that contains the information that will identify the current ECM. Select "OK".
Select "File/Disconnect F8" from the drop-down menu. Note: Do not shut down Cat ET.
Replace the ECM. Note: This procedure describes replacement of the engine 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 g01919599
Mounting of a typical A4 ECM
(1) ECM mounting hardware
(2) Ground strap assembly
Use a 7 mm hex wrench to disconnect ECM connectors (3).
Remove the mounting nuts from the studs that are part of ECM mounting hardware (1).
Remove the screw from the ECM for ground strap assembly (2). Note: The rubber grommets behind the ECM are held in place by the mounting studs. These 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 mounting plate.
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. Install the screw for the ground strap assembly into the ECM. Ensure that the ground strap has good continuity to the case of the ECM as you tighten the screw. Install the other three mounting nuts.Check the mounting