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Torque » Torque OBD ECU Scanner » Torque Discussion / Ideas » Wrong Coolant Temperature

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Author Topic: Wrong Coolant Temperature
Sticks13
Member
Posts: 2
Post Wrong Coolant Temperature
on: July 18, 2018 (GMT)

Hi,

Torque Pro is incorrectly reading the engine coolant temperature, it’s roughly 20 degrees C too low. And it’s not a faulty sensor. I have verified the temperature using Forscan on my laptop via a usb OBD2 link, and using Forscan Lite with a Bluetooth OBD2. These both also match what my dash temperature gauge reads. I have also used 2 different phones to rule that out.

Has anyone else had this problem?

Capp777
Member
Posts: 2994
Post Re: Wrong Coolant Temperature
on: July 18, 2018 (GMT)

I would be curious if your vehicle is using
A-50 versus the earlier A-40 equation.

Try creating your own custom pid with the
A-50 °C equation using the same pid.

For example using byte A of 0x8c (140 decimal):

140 – 40 = 100°C = 212°F
140 – 50 = 90°C = 194°F

an 18°F difference.

What pid are you using to read ECT?

What are the details of your vehicle?
Sticks13
Member
Posts: 2
Post Re: Wrong Coolant Temperature
on: July 19, 2018 (GMT)

Hi Capp777,

I believe the PID is 05, the vehicle is 2010 Ford Mondeo 1.8tdci. I’ll have a look on the wiki page for setting a custom PID as this is new to me.

Thanks.
Capp777
Member
Posts: 2994
Post Re: Wrong Coolant Temperature
on: July 19, 2018 (GMT)

Torque gives you the ability to create your
own custom pids which then can be added to
the dashboard.

The long name must be unique though.

Long Name: Your Engine Coolant Temperature
Short: ECT
Header: Auto
Mode/PID: 0105
Equation: A-50
Units: °C
Min: -50
Max: 205
Scale: x1
Start/Stop Diagnostic Command: leave blank

After creating the new pid go back to the
dashboard to add using the new unique
long name.

While in the pid editor and connected to your
vehicle, you can test for the raw hex response
from your vehicle.

Would love to compare the hex reading to the
dash readout you mentioned. earlier.

After rereading your first post I am not sure this
will fix your 20°C too low issue?

Any chance that TFT is being mistakenly read?

Edited.
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