KIT-COVER 3082874 - Caterpillar

Active Diagnostic Codes
An active diagnostic code represents a problem with the electronic control system. This problem should be corrected as soon as possible. When an active diagnostic code is generated, a display module such as the Caterpillar monitoring system may produce a warning.
Illustration 1 g00740986
The diagram indicates output voltage from the coolant temperature sensor. If the output voltage is less than 0.2 volts or if the output voltage is greater than 4.8 volts, the ECM will generate an active diagnostic code for the sensor. The diagnostic code was generated because an abnormal signal was received from the sensor.Logged Diagnostic Codes
When the ECM generates a diagnostic code the ECM logs the code in permanent memory in most instances. The ECM has an internal diagnostic clock. The ECM will record the hour of the first occurrence of the diagnostic code. The ECM will record the hour of the last occurrence of the diagnostic code. The ECM will record the number of occurrences of the code. This information is a valuable indicator for troubleshooting intermittent problems. Any Logged diagnostic codes will automatically be deleted if no additional occurrences are recorded in 100 hours. Some diagnostic codes may be easily triggered. Some diagnostic codes may log occurrences that did not result in complaints. The most likely cause of an intermittent problem is a faulty connection or damaged wiring. The next likely cause is a component failure. The least likely cause is the failure of the ECM. Diagnostic codes that are logged repeatedly may indicate a problem that needs special investigation.If the symptoms continue, use the proper procedure for troubleshooting the symptoms that have been experienced by the operator.Note: Always clear logged diagnostic codes after investigating and correcting the problem which generated the code.Diagnostic Terminology
Module Identifier (MID)
The module identifier (MID) indicates the electronic module that generated the diagnostic code.
The module identifier (36) indicates the engine ECM.Component Identifier (CID)
The component identifier (CID) indicates the component in the circuit that caused the diagnostic code to be generated.Failure Mode Identifier (FMI)
The FMI (00) indicates that the data is above the normal range.
The FMI (01) indicates that the data is below the normal range.
The FMI (02) indicates an incorrect signal.
The FMI (03) indicates that the voltage is above the normal range.
The FMI (04) indicates that the voltage is below the normal range.
The FMI (05) indicates that the current is below the normal range.
The FMI (06) indicates that the current is above the normal range.
The FMI (08) indicates an abnormal signal.
The FMI (09) indicates an abnormal update.
The FMI (12) indicates that a device or a component failed.
The FMI (13) indicates that a component is out of calibration.