HOSE AS 1357911 - 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 module identifier (MID), of the component identifier (CID) and of the failure mode identifier (FMI). The MID indicates the electronic module that generated the diagnostic code. The MID for the engine's Electronic Control Module (ECM) is 36. 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) or on one of the various electronic display modules. Do not confuse diagnostic codes with diagnostic events.
Active Diagnostic Codes and Event 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.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. 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.Logged Events
The ECM can log events. Events refer to engine operating conditions such as low oil pressure or high coolant temperature. Logged events do not indicate an electronic system problem.
Illustration 1 g00740986
The diagram indicates output voltage from the Coolant Temperature Sensor. The Cat ET can be used to turn these features ON and OFF. When the features are turned ON, the display will