9473 1 Mercury VALVE, Throttle

Complete the procedure in the order in which the steps are listed.
Table 2
Troubleshooting Test Steps Values Results
1. Check for Associated Diagnostic Trouble Codes
A. Connect the electronic service tool to the diagnostic connector.
B. Turn the keyswitch to the ON position.
C. Use the electronic service tool to check for active diagnostic codes relating to the coolant diverter valve or the DEF tank temperature sensor. Diagnostic Trouble Codes
Result: An associated diagnostic trouble code is present.
Repair: Troubleshoot the associated code. Refer to Troubleshooting, "Diagnostic Trouble Codes".
Result: Diagnostic trouble code 3031-10 is present.
Proceed to Test Step 2.
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.
Repair: Add coolant to the system.
Repair: Determine the cause of low coolant. Refer to Systems Operation, Testing and Adjusting, "Cooling System" for additional information.
If adding coolant does not correct the fault, proceed to Test Step 3.
3. Check the Engine Coolant Temperature
A. Start the engine. Allow the engine to warm up to normal operating temperature.
B. Connect to the electronic service tool.
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 4.
Result: The coolant temperature is less than 50° C (122° F).
Repair: Refer to Troubleshooting, "Coolant Temperature Is Low" for troubleshooting information.
4. Check for Coolant Leaks
A. Check for coolant leaks in the supply and return lines to the DEF tank header.
Leaks
Result: There are no leaks in the supply or return lines.
Proceed to Test Step 5.
Result: There are leaks in the supply or return lines.
Repair: Repair the leaks and refill the coolant system.
If the fault is still present, proceed to Test Step 5.
5. Inspect the Coolant Lines for Restrictions and Obstructions
A. Check for a restriction or obstruction in the coolant lines between the engine and the DEF tank header.
Restrictions
Result: There is a restriction in a line.
Repair: Repair or replace the lines with the restrictions.
Proceed to Test Step 8.
Result: The coolant lines are OK.
Proceed to Test Step 6.
Illustration 1 g03716402
Table 3
Troubleshooting Test Steps Values Results
6. Check the Electrical Connection at the DEF Tank Header
A. Inspect electrical connector (1) for the DEF tank header. Refer to Troubleshooting, "Electrical Connectors - Inspect" for further information. Refer to Illustration 1.
Check for corrosion or loose wires.
Electrical connections
Result: The electrical connector is not corroded or loose.
Proceed to Test Step 7.
Result: The electrical connector is corroded and/or loose.
Repair: Make the necessary repairs to the connectors. Cycle the keyswitch.
Proceed to Test Step 8.
7. Check the Coolant Diverter Valve Operation
Note: The coolant diverter valve will only operate if the DEF tank temperature is less than 15° C (59° F).
A. Turn the keyswitch to the ON position.
B. Start the engine.
C. Connect to the electronic service tool.
D. Monitor the "DEF Tank Temperature" for at least 20 minutes. Make sure that there is a gradual rise in the DEF tank temperature.
Note: If the DEF tank temperature reaches 17° C (62.° F), the coolant diverter valve will close.
Temperature rise
Result: The DEF tank temperature increased.
The fault appears to be resolved.
If the active diagnostic code returns, contact the Dealer Solutions Network (DSN).
Result: The DEF tank temperature did not increase.
Replace the coolant diverter valve .