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Old 06-24-2008, 08:23 PM   #1
jpb53
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Radiator Fan & A/C Pressure Transducer

Temp readings are from ECT (engine coolant temp sensor) Pressures are from A/C pressure transducer
Fan low speed 104 C (220 F) 1,724 Kpa (250 Psi)
High Speed 110 C (230 F) 2,068 Kpa ( 300 Psi )
Fan turns off at 101 C (214 F ) or when Pressure drops below 1,710 Kpa (241 Psi ) Low speed is at 30% speed and will increase from 31% up too 100% duty cycle depending on the temp or pressure inputs.

Transducer Voltage 0 Volts = transducer faulty or no voltage from PCM
.150 to .450 volts = Transducer Good/low pressure cut out condition
.451 to 4.519 volts = normal operating condition
4.520 to 4.850 volts =Transducer good High pressure cutout condition
5 volts = Transducer Faulty
Wire Colors Dark Blue = Switch output to PCM
Violet/ White tracer = 5volt supply from PCM to transducer
Black/ Lt Blue tracer = sensor ground
Hope this helps and clears up some problems for those trying to fix fan and A/C problems. Hope it makes sense.
Fan comes on with gauge at approx. 9/16 to 5/8 gauge reading.

Last edited by jpb53; 09-29-2008 at 06:16 PM. Reason: didn't work the way I wanted
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Old 06-25-2008, 02:41 AM   #2
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Re: Radiator Fan & A/C Pressure Transducer

And if we had a moderator it could be a sticky or permanent file at the top of the forum. Thanks for the info.
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Old 07-20-2008, 11:13 PM   #3
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Re: Radiator Fan & A/C Pressure Transducer

bump
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Old 09-29-2008, 06:18 PM   #4
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Re: Radiator Fan & A/C Pressure Transducer

bump
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Old 08-02-2016, 01:29 PM   #5
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Re: Radiator Fan & A/C Pressure Transducer

Please Bump! Might be related to P1491 in 2001 - 2002 minivans?
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