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Old 09-11-2014, 03:06 PM
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PCM connection for Hydraulic Fan

2003 Jeep WJ Limited, 4.7 (non H.O.) with hydraulic cooling fan

Does anyone know which plug and pins are used to control the hydraulic fan solenoid?
I have tested the solenoid and it is good so I am now trying to determine if the wiring is bad or the PCM.
What I am trying to avoid is cutting into the wiring bundles at the plugs to reveal the wire colors.
Thanks
Will

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Old 09-11-2014, 05:49 PM
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Re: PCM connection for Hydraulic Fan

Cav circuit function
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1 f142 18or/dg (gas) fused auto shut down relay output
2 k173 18lg (diesel) hydraulic radiator fan solenoid control
2 k173 18lg (gas) radiator fan relay control
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Old 09-11-2014, 06:12 PM
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Re: PCM connection for Hydraulic Fan

Hang on a bit Will before you start ripping into pcm wiring! Do you have any codes especially o2 sensor related or a 1499? Check out this thread. Bad,Bad Week for Ole Silver
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Old 09-20-2014, 11:41 PM
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Re: PCM connection for Hydraulic Fan

My hydraulic fan sucks to,not literally. Engine temp is at 230 and fan is just idling i say b.s on that setup
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Old 09-21-2014, 08:24 AM
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Re: PCM connection for Hydraulic Fan

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Originally Posted by hoffmanestates View Post
My hydraulic fan sucks to,not literally. Engine temp is at 230 and fan is just idling i say b.s on that setup
As any man made product, also the hydraulic cooling fan can give a problem, not making it a bad design on itself.
Remove the coolant temperature sensor connector and check if the fan goes to high speed. If it does, then you know that the fan and solenoid are working.
If it doesn´t, then you will need to check the solenoid first. No DTC set?
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Old 09-21-2014, 09:10 AM
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Re: PCM connection for Hydraulic Fan

We talked about this before, it goes in high speed when its unplugged, and cel goes on. Some reason seems like no signal is being sent. Or the threshold is set to high. Im going to change the coolant temp sensor and see if that fixes.
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