4-2 GTH-1544 Part No. 1272857September 2016Section 4 • Fault CodesDiagnostic DisplayWhen the engine Electronic Control Module (ECM)detects an abnormal operating condition, a faultcode is immediately stored in the ECM memory.The presence of faults is indicated by the word“SERVICE” (replacing GENIE) on the LCD displaywhich is located on the gauge cluster in theoperator's compartment.The gauge cluster also includes two warninglights.They are an amber colored light which signalsan abnormal engine condition which should becorrected as soon as possible and a red coloredlight which signals an engine condition whichrequires the operator to shut down the engine assoon as possible.The ECM will, in some cases, automatically shutdown the engine when the red light is displayed.Active Fault CodesTo make the active fault codes visible, start theengine, press the diagnostic button “d” and hold itpressed for at least 5 seconds.To quit the active fault codes page, press thediagnostic button “d” and hold it pressed for atleast 5 seconds.Active Codes vs Stored CodesActive fault codes, indicating an engine conditionor conditions which have not been corrected,are signaled on the LCD display by the word"SERVICE" replacing “GENIE”.Stored fault codes are the cumulative history offault codes which the ECM has detected. Thesefault codes may be recalled by service personnelat a later time even if the condition which causedthe engine fault has ceased to exist.Note: Additional hardware will be necessary toaccess stored codes.Decoding Fault CodesThe Suspect Parameter Number (SPN) and theFailure Mode Identifier (FMI), when combined,are the basis for an engine fault code. The SPNnumber indicates the affected component; theFMI number reveals the type of failure that hasoccurred. Comparing the combination of numbersto the fault code chart on the following pageswill help to determine the exact engine faultand a corrective course of action. For additionalinformation, refer to the engine operator's manualwhich came with your machine.FAULT CODESengine rpm000000.01230°c10560Gauge Clustera LCD screenb amber warning lightc stop engine lightd diagnostic buttonda b c