GEAR-PLANETARY 8R9750 - Caterpillar

When the electronic control module (ECM) generates a diagnostic code, the code will usually be logged in the permanent memory of the ECM.The ECM has an internal clock which records the operating hours of the ECM. When a diagnostic code is logged, following information is recorded with the code:
The hour of the first occurrence of the code
The hour of the last occurrence of the code
The number of occurrences of the codeIf the code is generated more than two times, the ECM does not record the hour of each occurrence. Instead, the ECM records a range for the hours of occurrence. This information is useful for troubleshooting intermittent problems.Caterpillar electronic service tools are used for the following service procedures:.
Obtaining information about the logged codes
Deleting the information from the memory of the ECMSome diagnostic codes require a factory password in order to be deleted. Diagnostic codes that do not require a factory password will be automatically erased from the memory if the codes do not recur within 100 hours of operation.