Where is the ECT Sensor located?

Tiny
KRITTER81
  • MEMBER
  • 2011 MAZDA B3000
  • 3.0L
  • 4 CYL
  • 4WD
  • MANUAL
  • 180,000 MILES
The temperature gauge is not working on my BT50. I am trying to troubleshoot but can't find the ECT Sensor. Where is it, please?
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Thursday, January 5th, 2023 AT 8:53 PM

5 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

The BT50 isn't offered in the US, but I will try my best to help. I need confirmation on the engine size. Is it a 4-cylinder or a 3.0L V6? Also, is it a diesel?

I will try cross-referencing it with the Ford Ranger to see if anything helps.

Take care,

Joe
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Saturday, January 7th, 2023 AT 8:23 PM
Tiny
KRITTER81
  • MEMBER
Hi Joe, it's a B3000 if that helps any. It is a 4 cylinder Diesel. Any help would be great.
Thank you
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Saturday, January 7th, 2023 AT 8:27 PM
Tiny
BORIS K
  • EXPERT
Hello,

The temperature gauge on instrument cluster receives its information from the ECM
(Engine Control Module) via CAN network
I would suggest first checking live data for the ECT (Engine Coolant Temperature) sensor in the ECM using a suitable diagnostic tool. This is to check that the ECM is receiving a plausible signal from the ECT sensor.

With ignition on and engine cold, stood over night, the ECT data should display ambient temperature.

Pin out from ECT sensor to ECM connector A

Pin 1, blue/orange wire to ECM pin A67
Pin 2, brown/yellow wire to ECM pin A56

I have looked in all my disposable technical information regarding the location of the ECT sensor.
None list the location. Below, in image 2, is where I believe the sensor to be at, near the outlet pipe to the radiator.

Input / Output Check Mode for instrument cluster
See image 1 below for related codes
This function allows checking the input and output circuits of the instrument cluster. It
can be activated in the following way:
1. Press and hold the odometer/tripmeter switch, and turn the ignition switch to the ON
position.
2. Continue holding the odometer/tripmeter switch for approx. 5 s. until test is
displayed on the LCD.
3. Release the odometer/tripmeter switch within 3 s after test is displayed.
4. When the odometer/tripmeter indicates check code 00, push the odometer/tripmeter
switch to select a check code.
5. Inspect the check codes according to the W/M.

Some related articles which might be of help:
https://www.2carpros.com/articles/coolant-temperature-sensor-cts-replacement
and
https://www.2carpros.com/articles/symptoms-of-a-bad-coolant-temperature-sensor

Also:
https://www.mazdabg.com/ftp-uploads/MAZDA%20material%20for%20technician/BT-50_en.pdf

This technical information covers the WL-C 2.5 16V engine but as the 3.0 engine is just a larger version so the information will be relevant

I hope this helps.

Cheers, Boris
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Sunday, January 8th, 2023 AT 1:24 AM
Tiny
KRITTER81
  • MEMBER
Thank you, Boris, I will look into it. Fingers are crossed this help.
Cheers,
Kristy
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Sunday, January 8th, 2023 AT 1:57 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Boris, thank you as well from me. It's great to know you are there to help with these.

Take care,

Joe
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Sunday, January 8th, 2023 AT 3:08 PM

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