Question about Ford F-350

1 Answer

Replaced ect sending unit and now temp gauge does not is running at operating temp and injectors are working fine, so there is a signal to computer, why no gauge?

Posted by on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Ford Master
  • 6,826 Answers

Maybe wiggle the wires around the harness and see if it's a bad connection to the temperature gauge.

In this case, I assume that it has more than 2 wires, and that one of the wires may not be connecting properly at the harness or the wire is broken inside of the insulation, or the gauge has gone bad (not as likeley).

Good luck on this repair.

Posted on Nov 09, 2010

  • Duane Wong
    Duane Wong Nov 09, 2010

    It's not as likely that the gauge has gone bad, rather.



1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

2 Answers

How do I check temp. Sensor?

it is a sender unit not a sensor unit
take the wire off it and see if the gauge falls to zero
put the wire back on and if it goes to hot ,replace the sender unit
the difference is that temp gauge sender units have 1 wire to it and work through the gauge to it then through a heat altered resistor in it to earth (ground)
A temp sensor has more wires to it and works from the ecm
it closes a circuit when the coolant reaches a preset temperature, sending a signal to the ECM which then closes a relay to make the fan/s run to cool the radiator

Oct 05, 2015 | 1997 Isuzu Hombre

1 Answer

How do I verify the ECT is working on my buick rendezvous

The only way to do it is to put it on a scanner and read the computer. But a good sign it isn't working is the temp gauge doesn't move. The ECT sends the signal to the computer(ECM), then the computer sends a signal to the gauge. Check engine light on?

Jan 16, 2015 | 2003 Buick Rendezvous

1 Answer

What is an OBD code 51 on 1990 toyota corolla 1.6L 4A-FE and how to test?

Well this answer is going to be a bit fuzzy.
Code 51 is for a switch signal issue. The possible causes are the throttle position switch, the neutral safety switch, and the ac compressor switch. One of those three is not sending a signal to the computer. So if its the ac switch, you know why.
But all three would need to be checked out.

Feb 06, 2014 | 1990 Toyota Corolla

1 Answer

Won t stay running when first started. runs fine once its warmed up

This sounds like the temp sending unit for the ecm is bad. There are 2 temp sensors, 1 for the light/gauge and 1 for the ecm. The sensor sends a signal to the ecm to tell it engine temp, the ecm them adjusts fuel mixture for cold or warm engine.This works much the same way as the choke does on a carb for cold starts

Jan 11, 2014 | Dodge Durango Cars & Trucks

1 Answer

Temp gauge 2004 Montana

There are two possible candidates here, both of which you claim to have "checked" as good. They are the ECT (Coolant Sensor) or the thermostat. As the gauge works "occasionally and when it does fuel mileage is much improved", I would take the cheap route and change the T-stat and see what happens. If the thermostat is intermittent sticking in a wide open condition, this will result in the inability of the engine to regulate its coolant temperature. Engines run more efficiently at higher block temps because it aids in the combustion process. Many DIYers often change out 180 degree thermostats for 195 degree ones because they see marked improvement in power and fuel mileage. The ECT samples the temperature of the coolant and sends a signal to the PCM. The PCM uses that to determine rate of fuel delivery and also sends the signal to the temperature gauge on the instrument panel. A cooler engine needs more fuel, thus the decrease in gas mileage. You don't mention anything about the vehicle running rough, so I'm assuming that the ECT has it right. If the ECT were faulty and the engine were warmer than the ECT says, you would probably start having running issues since the engine would be running too rich, and that could possible even set error codes and the Check Engine Light.

Nov 11, 2013 | Cars & Trucks

2 Answers

Looking for the temperature sensor on my 1999 honda Odyssey because the temp gauge has been stuck on high since I bought it 4 months ago. What else could be the problem?

USA answer, not in usa , ignore my post or post country?
it can only be 3 problems, covers the simple tests.
1: bad sender (if scan tool shows ECT reads right, its not this)
2: bad wires (conns) ECU/pcm to gauge.
3:bad gauge.
factory FSM or

here is your type system, its no longer independent like in older years
The coolant temperature information is conveyed to the instrument panel, through the PCM, from the Engine Coolant Temperature (ECT) gauge sending unit. To test the gauge sending unit, first test the gauge operation to make sure the problem is not in the gauge or gauge wiring.
end quote.

my guess ? bad connection to I/P gauge cluster (rear)
do this only after scanning (any scan tool works) the ECU OBD2 port to see if temperature is normal at the ECT but Guage lies.
that is it. only testing wires an gauge, works from this point.

Oct 16, 2013 | Cars & Trucks

1 Answer

1990 gmc K1500 5.7L, temp. gauge not working:

To review, you have two temp sensors, one for the gauge on the dash and one for the computer. If you unplug the sensor for the computer the reading will be minus 30 degrees or over 300 which will make it very hard to start. Unplugging the sensor for the gauge would have no effect on the computer.
According to the wiring diagram, the wire for the temp gauge is green, and the wires for the temp sensor for the computer are yellow and black.

Aug 24, 2012 | 1990 GMC Sierra

1 Answer

Temp gauge does not work

Is it a 4.0 v-6 engine? The sending unit is to the left of the thermostat housing.The one to the right(as you look at engine from the front)is the ECT that sends signal to computer.So replace the one to the left. don-ohio (:^)

Jan 16, 2012 | 1996 Ford Explorer

2 Answers

Fuel gage not working. Only a smsll light seen. Does the fuel pump need changing?

As long as the car is running fine it's safe to say the fuel pump does not need to be replaced. However the fuel tank sending unit may need to be replaced assuming the fuel gauge itself isn't at fault. First check your owners manual if available for your fuse block info and check fuses then I'd look into the sending unit. Let me know if you need help with that

Nov 29, 2010 | 1995 Volvo 940

3 Answers

Replaced complete fan assembly Two sensors. Fan

is the temp gauge working? sounds like coolant temp sending unit... or a possible engine coolant temp sensor or ect sensor.

Aug 05, 2009 | 1996 Ford Mustang

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

68 people viewed this question

Ask a Question

Usually answered in minutes!

Top Ford Experts


Level 3 Expert

76682 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22219 Answers


Level 3 Expert

5537 Answers

Are you a Ford Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides