90303-ZW1-B02 Honda NUT, HEX. (16MM) (Honda Code 6017347).

The 3031-7 code will be logged when the engine is running, the Diesel Exhaust Fluid (DEF) tank temperature is colder than -8° C (17.6° F) and the DEF tank temperature started to rise, but has fallen back below-8° C (17.6° F).The 5798-7 code will be logged when the engine is running, the DEF tank temperature is warmer than -8° C (17.6° F), the DEF tank temperature has increased, but the DEF pump temperature has not changed.
Table 2
Associated Diagnostic Trouble Codes    
J1939 Code    
3363-5    
3363-6    
4354-5    
4354-6    
4355-5    
4355-6    
4356-5    
4356-6    
5491-5    
5491-6    
Table 3
Troubleshooting Test Steps    Values    Results    
1. Check for Associated Diagnostic Trouble Codes
A. Download the "Warranty Report" from the engine ECM before performing any troubleshooting or clearing diagnostic trouble codes.
B. Determine if an associated diagnostic code is present.
    Diagnostic Trouble Codes    
Result: An associated diagnostic trouble code is not present.
Proceed to Test Step 2.
Result: An associated diagnostic trouble code is present.
Troubleshoot the associated code.
   
2. Check the Coolant Level of the Engine
A. Determine if the engine coolant level is full.
   
Coolant Level
   
Result: The coolant level is full.
Proceed to Test Step 3.
Result:The coolant level is not full.
Add coolant to the system.
Determine the cause of low coolant. Refer to Troubleshooting, "Coolant Level Is Low" for additional information.
Proceed to Test Step 3.
   
3. Check for Coolant Leaks
A. Check the entire engine cooling system for signs of coolant leaks.
B. Inspect the coolant supply and return lines to the Pump Electronic Tank Unit (PETU) for leaks or damage that may cause restrictions.
   
Leaks
   
Result: No leaks were detected.
Proceed to Test Step 4.
Result: There were leaks or damaged lines detected.
Repair the leaks or damaged lines and refill the coolant system.
Proceed to Test Step 4.
   
4. Check the Electrical Connection at the DEF Tank Header
A. Inspect the electrical connections to the DEF tank header. Refer to Troubleshooting, "Electrical Connectors - Inspect" for further information.
Refer to Illustration 1.
Look for corrosion or loose wires.
   
Electrical connections
   
Result: The electrical connectors are free of corrosion and are not loose.
Proceed to Test Step 5.
Result: The electrical connections are not free of corrosion and/or are loose.
Make the necessary repairs to the connectors.
Proceed to Test Step 5.
   
Illustration 1 g03777678
(1) DEF tank header electrical connector (2) DEF tank header
Table 4
Troubleshooting Test Steps    Values    Results    
5. Check the Engine Coolant Temperature
A. Start the engine. Allow the engine to warm up to normal operating temperature.
B. Connect to Cat® Electronic Technician ( Cat ET).
C. Select the Status Parameters tab.
D. Check the coolant temperature.
The temperature should be greater than
50° C (122° F).
   
Coolant temperature
   
Result: The coolant temperature is greater than
50° C (122° F).
Proceed to Test Step 6.
Result: The coolant temperature is not greater than
50° C (122° F).
Refer to Troubleshooting, "Coolant Temperature Is Low" for troubleshooting information.
   
Illustration 2 g03777680
(3) Coolant diverter valve (4) Coolant return to the engine water pump inlet
Table 5
Troubleshooting Test Steps    Values    Results    
6. Check the DEF Coolant Diverter Valve Operation
A. Turn the keyswitch to the ON position.
B. Start the engine.
C. Connect to Cat ET.
D. Connect to the "Engine #1 Aftertreatment Controller"
E. Perform the "Aftertreatment Diesel Exhaust Fluid Tank Heater Test"
The DEF tank temperature must be within
5° C (9° F) of ambient air temperature prior to performing this service test.
   
"Aftertreatment Diesel Exhaust Fluid Tank Heater Test"
   
Result: The "Aftertreatment Diesel Exhaust Fluid Tank Heater Test" was not successful.
Repair: A failed coolant diverter valve has been detected. Replace the coolant diverter valve. Refer to Disassembly and Assembly for the correct procedure.
Proceed to Test Step 7.
Result: The "Aftertreatment Diesel Exhaust Fluid Tank Heater Test" was successful.
Result: A failed DEF pump temperature sensor has been detected. Replace the DEF pump. Refer to Disassembly and Assembly for the correct procedure.
Proceed to Test Step 7.    
7.