PUMP GP-PISTON 4182202 - Caterpillar

Diagnostic Codes
Diagnostic codes are used by the electronic system to alert the operator that a problem exists and indicates to the service technician the nature of the problem.Diagnostic Codes may be viewed using Electronic Service Tools (ET or ECAP) or the various electronic display modules. The CID, or Component IDentifier, tells which component in the system the diagnostic code is for. The FMI, or Failure Mode Identifier indicates what the failure mode is.The code number will direct you to a procedure in Functional Test Procedures. Do not confuse diagnostic codes with diagnostic events. Events can be logged in the ECM to track information about the engine. An example would be a low oil pressure event. An event is generated when the engine oil pressure is low but not out of range for the sensor. This does not indicate a problem with the sensor, rather it indicates a problem with the engine oil pressure. Refer to Logged Events later in this section for more information.Active Diagnostic Codes
An ACTIVE diagnostic code represents a problem with the electronic control system that should be investigated and corrected as soon as is practical. If the condition generating the diagnostic occurs only for a brief moment, the message will disappear and the diagnostic code will be LOGGED in the ECM memory.To troubleshoot an active diagnostic code, refer to the Diagnostic Code Cross Reference to Functional Test Procedures in this section under the specific code number.Logged Diagnostic Codes
When the ECM generates a diagnostic code, it will log the code in permanent memory within the ECM. The ECM has an internal diagnostic clock and will record the hour of the first occurrence, the hour of the last occurrence and the number of occurrences of the code. Knowing when and how often the code was generated can be a valuable indicator when troubleshooting intermittent problems.Logged codes can be retrieved or erased using an Electronic Service Tool. Logged diagnostic codes will automatically be deleted if no additional occurrences are recorded in 100 hours. When investigating logged diagnostic codes, keep in mind the following informationSome diagnostic codes may be sensitive, and may log occurrences that did not result in operator or pilot complaints. If the time the code was logged does not correlate to a complaint, there may be nothing to fix.The most likely cause of an intermittent problem is a faulty connection or damaged wiring. Next likely is a component failure (sensor or switch). Least likely is failure of the ECM itself.Diagnostic codes that are logged repeatedly may indicate a problem that needs special investigation.To troubleshoot a logged diagnostic code, refer to the Diagnostic Code Cross Reference to Functional Test Procedures in this section under the specific code number.The code number will direct you to a procedure in Functional Test Procedures. If the symptoms continue, use the proper procedure for troubleshooting the symptoms that have been experienced by the operator. Refer to Troubleshooting Without A Diagnostic Code. Always clear logged diagnostic codes after investigating and correcting the problem