DOWEL 2S7316 - Caterpillar

Diagnostic codes alert the operator that a problem exists. Diagnostic codes indicate the nature of the problem to the service technician. Diagnostic codes consist of the following identifiers: module identifier (MID), component identifier (CID) and failure mode identifier (FMI). The MID indicates the electronic module that generated the diagnostic code. The MID for the engine's Primary Electronic Control Module (ECM) is 36. The MID for the engine's Secondary Electronic Control Module (ECM) is 47. The CID indicates the component in the system. The FMI indicates the failure mode that is present. Diagnostic codes may be viewed on the Caterpillar Electronic Technician (ET). Do not confuse diagnostic codes with diagnostic events.
Active Diagnostic Codes
An active diagnostic code represents a problem with the electronic control system. Correct this problem as soon as possible. When an active diagnostic code is generated, a display module such as the Electronic Monitoring System (EMS) may produce a warning.
Illustration 1 g00740986
Typical example
Illustration 1 indicates a typical output voltage from the coolant temperature sensor. The Cat ET can be used to monitor the output voltage and temperature of any sensor. The Cat ET will display diagnostic codes that are associated with a sensor. As you look at Illustration 1, notice the output voltage of the sensor. A diagnostic code is generated when the ECM detects an abnormal output voltage from the sensor.Note: Always clear logged diagnostic codes after investigating and correcting the problem which generated the code.Logged Diagnostic Codes
When the ECM generates a diagnostic code the ECM logs the code in permanent memory. 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. 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.