Why do I have two coolant temp sensors?

[Dshow]

I have a 2001 5.7L Mercruiser EFI with raw water cooling. I notice I have two temperature sensors on the thermostat housing. Service Manual 24 says they are the Engine Coolant Temperature Sensor and then Water Temperature Sender. Are these sensing the same temperature? Is one for the dash and one for the ECM?

Thanks-

 

[Reel Poor]

Re: Why do I have two coolant temp sensors?

Is one for the dash and one for the ECM?

Thanks-

You are correct in this assumption.

 

[Dshow]

Re: Why do I have two coolant temp sensors?

Then why is there not two oil pressure sensors?

Thanks-

 

[xltier]

Re: Why do I have two coolant temp sensors?

because the fuel injection is partially controlled by the coolant temp sensor