GASKET 2P8643 - Caterpillar

Conditions Which Generate This Code:The close breaker output drives the Breaker Control Relay (BCR). The BCR activates the generator circuit breaker, connecting the generator to the bus. The inactive level of this output is floating (may range from approximately 5.2 DCV to battery positive), and the active level is at battery negative ("B-").For Automatic Synchronization, the close breaker output is pulsed active for a programmed period of time according to setpoint P302. As long as synchronization conditions are met, the close breaker output will be activated repeatedly at one second intervals until the breaker sensor input indicates the generator circuit breaker is closed or setpoint P314, Maximum Synchronization Time is exceeded.For SemiAutomatic or Permissive synchronization, the Close Breaker Output will be held active as long as synchronization conditions are met.A possible cause of a CID 0858 FMI 04 is a short to battery negative (B-) of the Close Breaker Output signal. A CID 0858 FMI 04 is only detected when the GSC+P is NOT activating the Close Breaker Output. The GSC+P treats a CID 0858 FMI 04 as an alarm fault. CID 0858 FMI 04 will cause the GSC+P to stop the synchronization process until the diagnostic code is cleared and corrected.Test Step 1. CHECK THE INACTIVE VOLTAGE LEVEL OF THE CLOSE BREAKER OUTPUT.
Turn the "ECS" switch to STOP.
Locate the wire that connects pin 37 on the GSC+P and terminal 11 on the SMS.
Remove the wire from terminal 11 on the SMS only. GSC+P remains connected to the wire.
Use a cable probe to measure the voltage at pin 37 on the GSC+P.Expected Result:The voltage should measure 5.2 1.0 DCV.Results:
OK - The voltage measures 5.2 1.0 DCV. The voltage is correct. Proceed to test step 2.
NOT OK - The voltage is below 5.2 1.0 DCV.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". Stop.Test Step 2. CHECK THE ACTIVE VOLTAGE LEVEL OF THE CLOSE BREAKER OUTPUT.
The wire from terminal 11 on the SMS remains disconnected. GSC+P remains connected to the wire.
Start the engine and run the engine.
Perform the Permissive Paralleling function. If necessary, refer to Systems Operation, "Synchronization Sequence Of Operation".
Manually bring the engine into sync with the bus. The synchroscope pointer will be at the top center position indicating 0° phase angle.Expected Result:When the "IN SYNC" symbol is turned ON, the close breaker output voltage level should read 0.0 1.0 DCV.Results:
OK - The voltage level is 0.0 1.0 DCV. The voltage level is correct. The GSC+P is operating correctly.Repair: The problem is in the wiring or a component connected to the close breaker output. Use the FMI information and the close breaker output system schematic to find the exact cause of the diagnostic code. Stop.
NOT OK - The voltage level is not 0.0 1.0 DCV. The voltage level is NOT