- an invalid signal from an input
- an improper feedback from an output
- an internal error
One method of displaying diagnostic information is provided:
- Diagnostic codes with descriptive text can be viewed with the Caterpillar Electronic Technician (ET).
Display the diagnostic code with the Caterpillar Electronic Technician.
This method of displaying the diagnostic codes uses the service tool to display the codes. The Component Identifier (CID) identifies the specific component for a specific diagnostic. The Failure Mode Identifier (FMI) identifies the type of diagnostic that was detected. The diagnostic codes allow consistent identification of the problem. The service tool is used to display the CID-FMI with descriptive text for each combination. The descriptive text will help to avoid mistakes in interpreting the codes.
Active diagnostics indicate the presence of active diagnostic codes in the MSS. A diagnostic code informs the operator that a problem exists with the MSS.
If the Cat service tool is available, the service tool can be used to display all active diagnostic codes. The service tool will also display codes that have been logged.
A logged diagnostic will record problems that are intermittent in the Machine Security System. Logged diagnostics eliminate the need to duplicate problems that are intermittent. Logged diagnostics will increase the accuracy of diagnosis. The time that is required to troubleshoot a problem is reduced with the use of Diagnostics. Logged diagnostics eliminate the need for trip recorders that are used to capture intermittent diagnostic information.
The memory of the control module is used to store diagnostic information. When a diagnostic code is detected, the following information is logged:
- The CID will identify the component that has failed.
- The FMI will describe the problem.
- Number of occurrences of the diagnostic code
- The time of the first occurrence that the diagnostic was detected.
- Last occurrence time, when the diagnostic was last detected (stored with both machine hours and RTC stamp)
The problems which can be logged are listed in Troubleshooting, "Diagnostic Code Procedures".
The MSS logs the number of times that the machine is started with the methods that are listed below:
- Starting using an unauthorized method