CONNECTOR 6V8716 - Caterpillar

This procedure covers the following diagnostic codes:
Table 1
Diagnostic Trouble Codes for High Fuel Temperature    
J1939 Code    Code Description    Comments    
174-15     Engine Fuel Temperature 1 : High - least severe (1)     The temperature of the low-pressure fuel in the high-pressure fuel pump is high.
The ECM has been powered for at least 2 seconds.
The engine has been operating for at least 185 seconds.
There are no other faults in the electrical system.
The warning lamp will come on.
The warning lamp will go off when the temperature drops below the trip point.    
174-16     Engine Fuel Temperature 1 : High - moderate severity (2)     The temperature of the low-pressure fuel in the high-pressure fuel pump is high.
The ECM has been powered for at least 2 seconds.
The engine has been operating for at least 185 seconds.
There are no other faults in the electrical system.
The warning lamp will come on.
The engine may be derated by 20%.
The warning lamp will go off when the temperature drops below the trip point for 15 seconds.    Probable causes
Incorrect position of fuel shut-off valves
Fuel level in tank
Return fuel cooler (if equipped)
Return fuel lines
Location of the fuel tankRecommended Actions
Note: Complete the procedure in the order in which the steps are listed.
Table 2
Troubleshooting Test Steps    Values    Results    
1. Incorrect Position of Fuel Shut-off Valves
A. Make sure that any fuel shut-off valves in the feed lines between the fuel tank and the engine are open.
B. Make sure that any fuel shut-off valves in the return lines between the engine and the fuel tank are open.
   
Valve positions
   
Result: A fuel valve is closed or not fully open.
Move the valve to the fully open position.
Result: All fuel valves are fully open.
Proceed to Test Step 2.
   
2. Fuel Level in Tank
Note: If the level in the fuel tank is low, the hot return fuel can raise the temperature in the fuel tank.
A. Check the fuel level in the fuel tank.
   
Fuel level
   
Result: The fuel level in the tank is low.
Replenish the fuel tank at the earliest opportunity.
Result: The fuel level in the tank is sufficient to prevent excessive fuel heating.
Proceed to Test Step 3.
   
3. Return Fuel Cooler (If Equipped)
A. Check the fins on the return fuel cooler for blockage with dirt or debris. Check for fins that are bent or missing.
   
Fuel cooler
   
Result: The fins on the return fuel cooler are blocked with dirt or debris.
Clean the return fuel cooler.
Result The fins on the return fuel cooler are bent or missing.
Repair or replace the return fuel cooler.
Result The return fuel cooler is OK.
Proceed to Test Step 4.
   
4. Return Fuel Lines
A. Check the return fuel lines for blockage or restrictions.
   
Return fuel lines
   
Result: The return fuel lines are blocked or restricted.
Clear the blockage or restriction. If necessary, replace the return fuel line.
Result The return fuel lines are clear.
Proceed to Test Step 5.
   
5. Location of the Fuel Tank
A. Make sure that the fuel tank is not close to a