TANK GP-DIESEL EXHAUST FLUID 4669616 - Caterpillar

This code is generated by the fuel injection pump.The fuel injection pump detects one of the following conditions:
The fuel injection pump did not receive a position signal.
The signal that is received by the fuel injection pump is incorrect.The Electronic Control Module (ECM) will log the diagnostic code. The diagnostic code may be viewed on the electronic service tool.System Response:The fuel injection pump will provide open loop engine timing. The ECM will derate the engine power by 20% while the diagnostic code is active.Possible Performance Effect:The engine can experience any of the following conditions:
Small loss of engine performance
Increased emissions
The engine may be difficult to start.Troubleshooting:Further troubleshooting is required.Test Step 1. Check for the following active code:
Diagnostic code 0320-02
Diagnostic code 0320-11
Diagnostic code 1684-08Results:
0320-02 or 0320-11 code active - Refer to Troubleshooting, Troubleshooting with a Diagnostic Code for the displayed code.
1684-08 code active - Proceed to Test Step 2.Test Step 2. Inspect the electrical harness on the engine.Pay close attention to the following areas:
P1/J1 ECM connector
P40/J40 Fuel injection pump connector
P1:59 Engine position
P40:8 Engine positionRefer to Troubleshooting, "Electrical Connectors - Inspect".Results:
OK - Proceed to Test Step 3.Test Step 3. Check continuity between the following connections:
P1:59 Engine position
P40:8 Engine positionExpected Result:If the fault is eliminated, then STOP.If the fault still exists, Inspect the harness to identify the cause of the fault.Repair the wire harness or replace the wire harness.Check that the repairs have eliminated the fault.Results:
OK - STOP
Not OK - Contact the Dealer Solutions Network (DSN) for further advice. Use of a test ECM may be recommended.