I did a DTC check on my 2001 XKR s/c and got these codes. Can someone point me in the correct direction to understand and fix them. I am using a CANOBD2 scan tool model # 3130. I am new to this. Any help would be appreciated.

Mileage: 40600
Stored:
P1638 CAN Link ECM/INSTM Circuit/Network
P1649 Flash memory - FCCP monitoring malfunction

Pending:
P1111 System Pass
P1649 Flash memory - FCCP monitoring malfunction

MIL ON
Misfire Monitoring Complete
Fuel System Monitoring Complete
Comprehensive Component Monitoring Complete
Catalyst Monitoring Complete
Heated Catalyst Monitoring Not Supported
Evaporative System Monitoring Complete
Secondary Air System Monitoring Not Supported
A/C System Refrigerant Monitoring Not Supported
Oxygen Sensor Monitoring Complete
Oxygen Sensor Heater Monitoring Complete
EGR System Monitor Complete
DTC for which Freeze Frame was Stored P1638
Fuel System 1 Status Open Loop
Fuel System 2 Status Open Loop
Calculated LOAD Value 35.29 %
Engine Coolant Temp 64.40 °F
Short Term Fuel Trim - Bank 1 0.00 %
Long Term Fuel Trim - Bank 1 3.91 %
Short Term Fuel Trim - Bank 2 0.00 %
Long Term Fuel Trim - Bank 2 2.34 %
Intake Manifold Absolute Pressure 14.17 inHg
Engine RPM 1333 rpm
Vehicle Speed Sensor 0.00 mph
Intake Air Temperature 64.40 °F
Air Flow Rate Mass Air Flow Sensor 2.56 lb/min
Absolute Throttle Position 9.41 %

 

Gus, one of the moderators, has a list of all of the OBD codes here. Look over on the right side of the page.

 

I have a new JTIS system disk and can pull the codes but am having trouble figuring out how to check them out.

 

Yes, you're far better off using JTIS to interpret any fault codes if you have access to it. Make sure you are using the correct DTC chart for your specific model and MY.

Not sure of all that you want interpretted, but here goes:

Forget everything below MIL ON. This was a data capture, evidently when you recorded the the P1649. Nothing below MIL ON will help in diagnosis, first, because the engine was cold when captured. The system entered closed loop and it appears initial fuel trim is normal, but nothing here would relate to P1649 or P1638.

Back to the top, and I don't personally use the same scan tool, it appears by the stored and pending codes, you're dealing with a possible intermittent short circuit as P1649 looks to have stored, cleared (P1111) then reappeared. P1638 cleared itself as it didn't reappear pending. CAN network problems are a particular challenge because there could be a physical fault or a logical fault, sometimes with one causing the other.

The actual diagnosis is not very possible online and without seeing the car. I could send you in lots of directions inspecting harnesses, connectors, etc., but its going to be the same as working on the car with a blindfold on.