BOLT 7X2566 - Caterpillar

System Operation Description:The EMCP 4 determines the engine speed, in rpm, from the magnetic pickup. The input from the magnetic pickup will be a frequency that is proportional to the engine speed and to the number of flywheel teeth. The EMCP 4 will convert the frequency of the engine speed sensor input into rpm based on the flywheel teeth setpoint value.Note: If the EMCP 4 is programmed to receive engine information from the data link, then sensor wiring will be going to the engine.The relationship between engine speed and generator frequency can be computed based on the number of generator poles. If the engine speed does not correspond to the generator frequency, "ENG SPEED-GEN FREQ MISMATCH WARN" will be displayed on the EMCP 4. This message informs the operator of the mismatch condition.Note: Refer to the engine Troubleshooting manual for more information regarding engine speed for your particular genset.Conditions Which Generate This Code: This code is generated when engine speed and frequency values mismatch by more than 10% for more than 10 seconds. If the setpoint for number of generator poles is set to a value of 0 poles, then this condition is not tested.Test Step 1. PERFORM THE INITIAL CHECK.
Check for active diagnostic codes on the Engine ECM and the EMCP 4. If any codes are present, correct the diagnostic codes first. Expected Result:No other diagnostic codes or indicators are active.Results:
OK - No other diagnostic codes or indicators are active. Proceed to Test Step 2
NOT OK - Another diagnostic code is active or an indicator is active.Repair: Exit this procedure. Troubleshoot the active code or indicator. Resume normal operation and verify that the problem has been corrected.STOPTest Step 2. CHECK THE SETPOINTS.
View the setpoints (number of generator poles) and (flywheel teeth). Make a note of the setpoints. See Testing and Adjusting, "Electronic Control Module (Generator Set) - Configure". Compare the setpoints against the default setpoints of the particular generator set. Expected Result:The setpoints are correct.Results:
OK - The setpoints are correct for your particular genset.Repair: Reset the genset. Resume normal operation and verify that the problem has been corrected.STOP
NOT OK - The setpoints are NOT correct.Repair: Reprogram the setpoints. Reset the genset. Resume normal operation and verify that the problem has been corrected.STOP