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6nz catepillar where dies ecm read water temperature from

Customer Question
what sensor readings are changing...
6nz catepillar where dies ecm read water temperature from what sensor readings are changing in cat et when running when off numbers are stable
Submitted: 1 year ago.Category: Medium and Heavy Trucks
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Answered in 16 minutes by:
8/23/2016
Technician: Cat Man, Cat Engine Expert replied 1 year ago
Cat Man
Cat Man, Cat Engine Expert
Category: Medium and Heavy Trucks
Satisfied Customers: 9,082
Experience: I am ASE Master Truck Certified.
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Thanks for asking your question. I will try and help you out.

The ECM has a coolant temp sensor located in the front of the thermostat housing. This is how the ECM reads engine coolant temperature.

Please reply back if you need more help or have more questions. I am happy to assist.

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Customer reply replied 1 year ago
Even when unplugged its still reading temperature
Customer reply replied 1 year ago
It changes uo and down still
Technician: Cat Man, Cat Engine Expert replied 1 year ago

Yes it will continue to show a reading. That is called a default reading. When unplugged the coolant temp will read 194 degrees F, the ECM will also cut the fan on.

Does it change up and down with it unplugged? or when plugged up?

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Customer reply replied 1 year ago
No it reads 163 dies not show a fault like others
Customer reply replied 1 year ago
Changes when engine running
Customer reply replied 1 year ago
Up and diwn rapidly when off stays
Technician: Cat Man, Cat Engine Expert replied 1 year ago

Thanks for the information.

It sounds like you have a problem in the wiring harness or ECM. I would try pulling the coolant wires from the ECM. This would be pins 32 and 18 in the 70 pin connector. I have seen faulty wiring harness do this before on 2 wire temp sensors.

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Customer reply replied 1 year ago
Shoud i have 5volts on 1 and ground on other so i can test let me know thanks
Technician: Cat Man, Cat Engine Expert replied 1 year ago

Pin 2 is the ground. Pin 1 is the signal wire. If you test the wire it will have 5 volts on it. But the is s simple resister, you most likely have a wire in the harness touching something its not suppose to.

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Technician: Cat Man, Cat Engine Expert replied 1 year ago
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Customer reply replied 1 year ago
What temperature should ecm shut engine down at high water temperature
Technician: Cat Man, Cat Engine Expert replied 1 year ago
227 degrees F
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Customer reply replied 1 year ago
If it dontbaand waits until two thirty seven how do i adjust
Technician: Cat Man, Cat Engine Expert replied 1 year ago
The shut down temp is not adjustable.
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