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Does the ECT sensor control high speed fan operation?

 
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Old 17 Aug 2013, 06:41 pm
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Default Does the ECT sensor control high speed fan operation?

06 PT Cruiser.... trouble shooting problem with fans not operating. Have bypassed the relays and both hi/lo speed fans work. At the harness connector leading to the relays, I get no energizer signal to the relays, with A/C on and engine at operating temperature. This leads me to believe that it could be a PCM issue, as I believe the ECT sensor only has to do with low speed fan operation for engine cooling, and the high speed fan should come on whenever the compressor is running.

Is this correct...??

thanks for the input.
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Old 17 Aug 2013, 06:51 pm
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Post Re: Does the ECT sensor control high speed fan operation?

ECT sends the signal/temperature to the PCM/ECU which then sends the signal thru the proper fan relay(s) to the cooling fan......2006 and up PT's use Can-Bus system where everything electrical 'talks' (in a sense) to each other.
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Old 17 Aug 2013, 07:03 pm
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Default Re: Does the ECT sensor control high speed fan operation?

thanks....

so, the answer is yes, the ECT sensor controls high speed fan operation for A/C, and not just the low speed side for engine cooling..??
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Old 17 Aug 2013, 07:09 pm
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Default Re: Does the ECT sensor control high speed fan operation?

Quote:
Originally Posted by bigvinnie View Post
thanks....

so, the answer is yes, the ECT sensor controls high speed fan operation for A/C, and not just the low speed side for engine cooling..??
No It sends temp readings to the the ECM Everything else is done through the ECM. Fan runs when you turn AC on.
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Old 17 Aug 2013, 10:06 pm
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Default Re: Does the ECT sensor control high speed fan operation?

I wasn't clear... I realize the signal goes from the sensor to the ecm, not directly to the fan... the question is if the high speed relay depends on info received by the ecm from the ect sensor...

I'm thinking the high speed fan relay is energized independent of any ect info, such that the only thing necessary for it to be energized is having the compressor running.... can anyone confirm this...??

Trying to determine whether replacing the ect sensor will have any bearing on high speed fan operation.

Does anyone know the threshold temperature for low speed fan relay activation...??

thanks for any input.
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Old 19 Aug 2013, 12:34 am
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Default Re: Does the ECT sensor control high speed fan operation?

Bigv; When the coolant reaches about 200 degrees the low speed of the fan kicks on. When the coolant reaches about 215 degrees the high speed of the fan kicks on. This is about half-way on the dash temp gage.

The a/c turns on the fan [independently of the coolant temp] when certain conditions are met.
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