TUBE AS 2W7950 - Caterpillar

Conditions Which Generate This Code:The CID 0590 FMI 09 failure means that the engine electronic control module has stopped responding to the periodic requests for information from the PRCM. The PRCM detects this condition when there is a loss of the data signal on the CAT data link.Note: The PRCM will not communicate properly with the engine ECM if the data link cable exceeds 30.5 m (100 ft). See Specifications, "Electrical" for additional information.Note: The PRCM is capable of being programmed in order to treat diagnostic codes for the ECM in one of two ways.
Setpoint P03 is 1. The PRCM will display CID 0590 FMI 09 and the PRCM will display CID 0248 FMI 11. The diagnostic codes are displayed as being active. When the diagnostic codes are inactive, the diagnostic codes will NOT be logged.
Setpoint P03 is 2. The PRCM will display CID 0590 FMI 09 and the PRCM will display CID 0248 FMI 11. The diagnostic codes are displayed as being active. When the diagnostic codes are inactive, the diagnostic codes will be logged.Test Step 1. CHECK THE CAT DATA LINK
Disconnect the contacts 19 and 20 of the CAT data link from the PRCM.
Disconnect the contacts 13 and 14 of the CAT data link from the ECM.
Measure the resistance between contact 19 of the PRCM and contact 14 of the ECM.
Measure the resistance between contact 20 of the PRCM and contact 13 of the ECM.Expected Result:The resistance for both measurements is less than 5 ohms.Results:
OK - The resistance for both measurements is less than 5 ohms. The circuit is correct. The ECM has failed.Repair: It is unlikely that the ECM has failed. See Troubleshooting, SENR1003, "3500B EPG Engines"prior to replacing the ECM. Clear the diagnostic code from the fault log after troubleshooting is complete. The PRCM is usually programmed to treat a CID 590 diagnostic code as an "alarm fault". Stop.
NOT OK - The resistance for both measurements is greater than 5 ohms. The circuit is not correct.Repair: Repair the wiring of the CAT data link or replace the wiring of the CAT data link.Clear the diagnostic code from the fault log after troubleshooting is complete. The PRCM is usually programmed to treat a CID 590 diagnostic code as an "alarm fault". Stop.