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Daniel Wilson
Daniel Wilson,
Category: Medium and Heavy Trucks
Satisfied Customers: 5570
Experience:  Owner at DJ Wilson
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Code 174-3 says fuel temp to gh replaced sensor and same

Customer Question

code 174-3 says fuel temp to high replaced sensor and same thing fan was not working changed air valve on frame now fan works but wont go off
Submitted: 1 year ago.
Category: Medium and Heavy Trucks
Expert:  Daniel Wilson replied 1 year ago.

Hi my name is***** will be glad to help.

1. Start and run the engine.2. Run the engine through its operating range with no-load for approximately

ve minutes,allowing the engine coolant to reach normal operating range.[a] If the engine coolant temperature is 82-105°C (180-221°F), no further troubleshootingis required. Shut down the engine. If the engine coolant temperature is not 82-105°C (180-221°F), shut down the engine.Check thermo-modulated fan; refer to section 15.15.12.

15.15.12 Troubleshooting Procedure for Inoperative Thermo-ModulatedFan

To determine if an inoperative thermo-modulated fan is causing high engine coolant temperature,test the thermo-modulated fan. Refer to OEM guidelines.1. If the thermo-modulated fan is functioning correctly, check thermostats; refer to section15.15.14.2. If the thermo-modulated fan is not functioning correctly, refer to section 15.15.13.

15.15.13 Thermo-Modulated Fan Replacement

Perform the following steps to replace inoperative thermo-modulated fan:1. Replace inoperative thermo-modulated fan; refer to OEM guidelines.2. Verify thermo-modulated fan replacement; refer to section 15.15.13.1.

15.15.13.1 Test Engine with Replaced Thermo-Modulated Fan

Perform the following steps to determine if thermo-modulated fan replacement resolved highengine coolant temperature:

1. Start and run the engine.2. Run the engine through its operating range with no-load for approximately

ve minutes,allowing the engine coolant to reach normal operating range.[a] If the engine coolant temperature is 82-105°C (180-221°F), no further troubleshootingis required. Shut down the engine. If the engine coolant temperature is not 82-105°C (180-221°F), shut down the engine.Check thermostats; refer to section 15.15.14.

15.15.14 Troubleshooting Procedures for Faulty Thermostats

To determine if faulty thermostats are causing high engine coolant temperature, perform thefollowing:1. Remove thermostat from the thermostat housing; refer to section 4.6.1.2. Inspect thermostat for correct operation; refer to section 4.6.1.1.[a] If thermostat is fully open at 95°C (203°F), check water pump; refer to section15.15.16. If thermostat is not fully open at 95°C (203°F), refer to section 15.15.15.

Customer: replied 1 year ago.
Let me start over truck came in with the fan not working we replaced fan switch on the frame now the fan runs all the time the only code i get is 128-174-3 we have replaced fuel temperature sender with no change coolant temp is around 120 after 5 minutes of running
Customer: replied 1 year ago.
Fan doesn't run before truck builds enough air to kick in. Its not getting hot and fuel temp is not high
Expert:  Daniel Wilson replied 1 year ago.

Is the AC working properly and fully charged?

Customer: replied 1 year ago.
it is
Expert:  Daniel Wilson replied 1 year ago.

Is the AC clutch engaged at the same time constantly? Another thing is be sure you have the right fan switch normally open or normally closed and the parts stor did not give you the wrong switch. Its been known to happen.

Customer: replied 1 year ago.
Ok was mistaken ac was not working properly its full of freon you can shoot power to clutch and it kicks in
Expert:  Daniel Wilson replied 1 year ago.

Thanks for the update. Check the AC pressure switches and the harness for damage. When the AC circuit commands the compressor clutch on the fan also should come on.

Customer: replied 1 year ago.
Why does it still code 128-174-3 fuel temp
Expert:  Daniel Wilson replied 1 year ago.

Click these links for further troubleshooting. Lets try to get that code resolved first and see if your problem still exists. http://www.ddcsn.com/cps/rde/xbcr/ddcsn/11-MBE900-03a.pdf

http://www.ddcsn.com/cps/rde/xbcr/ddcsn/1-mbe900-05a.pdf

Expert:  Daniel Wilson replied 1 year ago.

Hi David, did you get this resolved?

Customer: replied 1 year ago.
No they had to have truck going to bring back soon
Expert:  Daniel Wilson replied 1 year ago.

Thanks for the update David. Keep me posted.