CUP 2B3380 - Caterpillar

Conditions Which Generate This Code:The CTR is used to indicate that the engine is beginning to run without cranking. The GSC activates the CTR when the engine speed is greater than the crank terminate adjustment. (Setpoint P011 should be 400 RPM.) Also, the starting motor relay has been deactivated. The CTR deactivates when the engine RPM reaches 0.Note: Whenever the GSC activates the CTR, "K3" is shown on the lower display. When the CTR is not activated, "K3" is not shown.The possible cause of a CID 0443 FMI 12 is an open coil or a shorted coil of the CTR.The system responses to this diagnostic code are listed below.
If the CTR is activated and a CID 0443 FMI 12 occurs the engine will continue to run.
If a CID 0443 FMI 12 occurs and the CTR is not activated, then the engine is able to start and the engine is able to run. The GSC treats a CID 0443 FMI 12 as an alarm fault. Active alarm faults are shown on the display when the "Alarm Codes" key is pressed. Also, the active alarm faults are shown when the ECS is in any position except the OFF/RESET position. Clear the diagnostic code from the fault log after troubleshooting is complete.This troubleshooting procedure is used to correct an active CID 0443 FMI 12 or the troubleshooting procedure is for an inactive CID 0443 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 0443 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 0443 FMI 12 is displayed as an active diagnostic code or CID 0443 FMI 12 is displayed as an inactive diagnostic code.Results:
OK - The CID 0443 FMI 12 is active or the CID 0443 FMI 12 is inactive. Proceed to test step 2.
NOT OK - The CID 0443 FMI 12 has not occurred. The diagnostic code is not active and the diagnostic code is not inactive. Stop.Test Step 2. CHECK THE INTERNAL CABLE OF THE RELAY MODULE.Note: Only open the relay module in a dry environment. If the relay module is open for more than twenty minutes, replace the desiccant bag which is located within the housing of the GSC. 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 relay module to the GSC.Expected Result:The cable should be firmly seated in the connector. The clamp should be in place. The cable should not be damaged.Results:
OK - The cable is firmly seated in the connector. The clamp is in place. The cable is not damaged. Reassemble the relay module to the