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Diagnostic Flash Code Retrieval
If the DIAGNOSTIC lamp is ON during engine operation, the system has detected a system fault. Use the DIAGNOSTIC lamp or electronic service tool to identify the diagnostic code.The DIAGNOSTIC lamp will illuminate (ON) and blink every five seconds whenever a diagnostic fault is detected by the ECM. The lamp should also illuminate (ON) whenever the START switch is turned ON, but the engine is not running. This condition will test whether the lamp is operating correctly. The DIAGNOSTIC lamp will illuminate for five seconds and turn OFF for an intermittent fault (stays ON ONLY if there is an Active Diagnostic Code).If the DIAGNOSTIC lamp comes ON and stays ON after initial start-up, the ECM has detected a system fault. Use the lamp or the ECAP service tool to determine the diagnostic code.The DIAGNOSTIC lamp can be used to communicate the specific diagnostic fault. With the switch depressed, the DIAGNOSTIC lamp will begin to flash. The sequence of flashes represents the system diagnostic message. Count the first sequence of flashes to determine the first digit of the diagnostic code. After a two second pause, the second sequence of flashes will identify the second digit of the diagnostic code. Any additional diagnostic codes will follow (after a pause) and will be displayed in the same manner.Refer to the Electronic Troubleshooting Manual for troubleshooting ELECTRONIC SYSTEM problems, or for further information or assistance, contact your Caterpillar dealer. Permanent Fault Logging
The system provides Permanent Fault Logging. When the ECM generates a diagnostic code, it will log the code in permanent memory. The logged codes can then be retrieved using an electronic service tool.Intermittent Fault
If the diagnostic lamp comes ON during engine operation, and then goes out, an intermittent fault may be occurring. The electronic control engine system is equipped with permanent fault logging. It will automatically log (or remember) most intermittent faults to help a service technician diagnose an engine problem.If there are no active codes logged into the system, only Code 34-Loss of Engine Speed Signal will be displayed when the engine is not operating.Engine Operation with Active Diagnostic Codes
If the diagnostic lamp is ON during normal engine operation, first check to ensure that the engine has proper oil pressure and coolant temperature. Then a decision can be made relative to shutdown by the operator.If oil pressure and coolant temperature are registering in the normal range, it is permissible to operate the engine. However, the engine must be scheduled for maintenance.
If oil pressure is below 103 kPa (15 psi), DO NOT continue to operate the engine. Engine damage can result.
If the engine has the proper oil pressure and the CHECK ENGINE/DIAGNOSTIC lamp is ON, this indicates that the system has identified a situation that is not within programmed parameters.The ACTIVE code should be investigated and corrected as soon as possible. Repairing the cause of the code will shut the lamp OFF (if there is the only one ACTIVE CODE) and will cause the code to be cleared