ADAPTER 4N6257 - Caterpillar

Conditions Which Generate This Code:The output of the "Speed Adjust 1" provides an analog signal that is being used to vary the engine speed in order to match the phase of the generator to the phase of the bus. The full output voltage is approximately −5.0 to +5.0 DCV. If the synchronization is disabled, the output will be 0.0 0.5 DCV.Note: Setpoint P308 must be set to a value that is greater than zero in order for this procedure to be completed. This setpoint can be a value from 0 to 100. The factory default is 50. See Systems Operation, "Parallel Setpoint Programming" for more information.The possible cause of a CID 1038 FMI 04 is a short from the output signal of the "Speed Adjust 1" to battery negative.A CID 1038 FMI 04 is detected when the GSC+P is NOT activating the output of the "Speed Adjust 1". The GSC+P treats a CID 1038 FMI 04 as an alarm fault. The synchronization process will be stopped until the diagnostic code is cleared and the diagnostic code is corrected.Test Step 1. CHECK THE INACTIVE VOLTAGE LEVEL OF THE OUTPUT OF THE "SPEED ADJUST 1".
Turn the engine control switch (ECS) to STOP.
Locate the wire that is connecting pin 27 of the GSC+P to the terminal 4 of the "BKRR". Remove this wire at the terminal 4 of the "BKRR"only. Pin 27 of the GSC+P will remain connected to the wire.
Use a cable probe to measure the voltage on pin 27 of GSC+P.Expected Result:The voltage should measure 0.0 1.0 DCV.Results:
OK - The voltage level is 0.0 1.0 DCV. Proceed to Test Step 2.
NOT OK - The voltage level is below the correct range or the voltage level is above the correct range.Repair: The GSC+ may have failed. It is unlikely that the GSC+ has failed. Exit this procedure and perform this entire procedure again. If the problem remains, replace the GSC+. See Testing And Adjusting, "EMCP Electronic Control (Generator Set) - Replace". STOPTest Step 2. CHECK THE ACTIVE