TUBE 3993642 - Caterpillar

ECM Mode" is a feature on the electronic service tool that is used to troubleshoot an engine that may have a problem with the Electronic Control Module (ECM). If an application supports this feature, the electronic service tool will allow a new ECM to be used temporarily as a test ECM.When the "Test ECM Mode" is activated, an internal timer sets a 24 hour clock. This clock will count down only while the ECM is powered. If the new ECM fixes the problem, the engine can be released while the "Test ECM Mode" is still active. After the ECM has counted down the 24 hour period, the ECM will exit the "Test ECM Mode". The parameters, the accumulated hours, and the engine serial number will be permanently programmed into the new ECM. The new ECM can no longer be used for another engine or for a test ECM.Note: When the"Test ECM Mode" is activated, the "Personality Module Code" is 0. After the ECM has counted down the 24 hour period, the "Personality Module Code" will be dependent on the application.If the fault is not eliminated with the new ECM and the 24 hour period has not expired, the ECM can be removed from the engine and reused as a new ECM on another engine. Anytime prior to the 24 hour limit of the "Test ECM Mode", a new engine serial number and new parameters can be reprogrammed.
Search for the latest flash file for the engine. Note: If a newer software version is available for the engine, install the newest software on the suspect ECM. If the new software does not fix the problem continue with this procedure.
Use the "Copy Configuration/ECM Replacement" feature on the electronic service tool to copy the configuration parameters from the suspect ECM to a personal computer (PC). If the "Copy Configuration/ECM Replacement" feature cannot be used, record the programmed values into the "Parameters Worksheet" in Troubleshooting, "Configuration Parameters". Record the injector serial numbers from the "Calibrations" screen under the "Service" menu on the electronic service tool. Note: The engine uses injectors that have trim codes or trim files that are associated with the injectors. The trim codes are printed on the injector. The injector serial numbers are necessary for obtaining the correct trim files from the electronic service tool. The trim file is a number that is specific to each unit injector. The ECM uses this number to compensate for manufacturing variations between individual injectors. If you replace any of the unit injectors, you must program the trim files for the new injectors. Also, if you replace the ECM, you must program all of the trim files into the new ECM.
Disconnect the suspect ECM. Temporarily connect the new ECM to the engine. Do not mount the new ECM on the engine. Note: The "Test ECM Mode" must be activated before the engine serial number is programmed into the new ECM. "Test ECM Mode" can only be activated if the engine serial number has not