GASKET 4N0641 - Caterpillar

Conditions Which Generate This Code:
Illustration 1 g00687608
System Schematic For The Run Relay (RR) On EUI EnginesThe run relay (RR) is available for the customer's use. The RR is located within the relay module. The GSC+ activates the RR during engine cranking and running.Note: Whenever the GSC+ activates or the GSC+ attempts to activate the RR, "K5" is shown on the lower display. When the RR is not activated, "K5" is not shown.The possible cause of a CID 0445 FMI 12 is an open coil or a shorted coil of the RR.The system responses to this fault are listed below.
If a CID 0445 FMI 12 occurs and the RR is activated, any customer's equipment on RM-24 of the relay module will be disabled. The customer's equipment that is connected to RM-23 will be activated.
If a CID 0445 FMI 12 occurs and the RR is not activated, any customer's equipment on RM-24 of the relay module will not be activated. The customer's equipment that is connected to RM-23 will remain activated.The GSC+ treats a CID 0445 FMI 12 as an alarm fault. Active alarm faults are shown on the display when the "Alarm Codes" key is pressed. Also, the engine control switch (ECS) must be in any position except the OFF/RESET position. Clear the diagnostic code from the fault log after troubleshooting is complete.This troubleshooting procedure is for an active CID 0445 FMI 12 or the troubleshooting procedure is for an inactive CID 0445 FMI 12.Test Step 1. CHECK THE STATUS OF THE DIAGNOSTIC CODE.
Turn the ECS to the OFF/RESET position and then turn the ECS to the STOP position.
Press the "Alarm Codes" key.
Observe the upper display. Check that the CID 0445 FMI 12 is active.
If the diagnostic code is not active, enter the Service Mode. View the fault log for a OP1. Check that the diagnostic code is inactive.Expected Result:A CID 0445 FMI 12 is displayed as an active diagnostic code or CID 0445 FMI 12 is displayed as an inactive diagnostic code.Results:
OK - The CID 0445 FMI 12 is active or the CID 0445 FMI 12 is inactive. Proceed to test step 2.
NOT OK - The CID 0445 FMI 12 has not occurred. The diagnostic code is not active and the diagnostic code is not inactive.STOPTest Step 2. CHECK THE INTERNAL CABLE OF THE RELAY MODULE.Note: Only open the relay module in a dry environment. If the inspection and repair takes more than approximately twenty minutes replace the desiccant bag in the GSC+ housing. See Testing And Adjusting, "Relay Module - Replace".
Turn the ECS to the OFF/RESET position.
Disconnect the battery negative cable.
Temporarily, remove the relay module from the GSC+. See Testing And Adjusting, "Relay Module - Replace".
Check the cable that attaches the