HOW TO DO AN ADVANCED SEARCH.

Mon Jul 08, 2013 3:56 pm by Admin


For the benefit of 944Hybrids users there are two search functions available for you to use.
The purpose of this sticky is to explain the "Advanced Search" function because it is much more powerful and is the best choice when researching information.

When you log on to the site a list of options is shown in a line at the top of the page. One option is labelled "Search", use this option (NOT the search box lower down on the right).

After you click on the upper search option, a drop down box appears. At the bottom of this box is a radio button marked "Advanced …

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cooling fans always on

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cooling fans always on

Post  948inVA on Thu Jun 28, 2012 5:40 pm

Having an issue with my fans - when I connected the battery for my first startup, the fans started up immediately with no key in the ignition. The only way I can get them to stop is by pulling the porsche cooling fan relay. For the wiring, I connected the GM PCM fan triggers to the wires going to the thermoswitch and kept the stock fan wiring. Any idea why they would be running with the engine off and key out?

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Re: cooling fans always on

Post  Arthropraxis on Thu Jun 28, 2012 6:13 pm

If the wiring isn't wrong it could be a bad relay. I may be reading this wrong "I connected the GM PCM fan triggers to the wires going to the thermoswitch". The PCM connects to the wires from the fan relay that go to the thermofan switch, cutting the thermofan switch out of the loop.
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Re: cooling fans always on

Post  948inVA on Thu Jun 28, 2012 6:21 pm

I cut the harness going to the thermoswitch, and routed the red/wht and brn/yel wires back under the dash to connect to the pcm harness.
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Re: cooling fans always on

Post  Admin on Thu Jun 28, 2012 6:22 pm

Did you unplug them from the thermal switch? ( the original Porsche wires)
Disconnect the GM wires from the Porsche wires and see if they come on, if so Bad relay or short in wiring. If they do not come on check the GM wiring output for negative out puts while everything is off. Maybe the ECU is sending out a trigger. Have you had the ECU reprogrammed?

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Re: cooling fans always on

Post  948inVA on Thu Jun 28, 2012 6:30 pm

Thanks for the help.. thermoswitch is not connected, I will try with the pcm harness disconnected. The ECU was reprogrammed by TPC!
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Re: cooling fans always on

Post  Arthropraxis on Thu Jun 28, 2012 6:33 pm

If the relay is bad, which it sounds like, inspect the solder joints for cracks before buying a new one.
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Fans running

Post  fliermike45 on Thu Jun 28, 2012 6:43 pm

I had this same problem.
Give me time to find the required info and I will report back. You have to cut one wire to the PCM.

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Re: cooling fans always on

Post  948inVA on Thu Jun 28, 2012 6:53 pm

I would be surprised if the relay is bad, it worked fine when I pulled the old motor.
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Fans running

Post  fliermike45 on Thu Jun 28, 2012 6:53 pm

I have cut the wire at Red Pin 14, The AC pressure sense signal, and the fans do not run when the engine is started. (PCM thinks AC is on)

It seems that when SSP wiring modified my loom they connected this wire within the loom as my pcm ac wiring is not used in my car.


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Re: cooling fans always on

Post  948inVA on Thu Jun 28, 2012 9:59 pm

Thanks Mike.. I will look into that wire. Although my harness may be different because it's from a GTO.
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Re: cooling fans always on

Post  948inVA on Fri Jun 29, 2012 4:52 pm

OK, I tried disconnecting the PCM and the fans didn't come on. I double checked my wiring back to the PCM and everything is straight. So it seems like a problem with the PCM programming.

Red/white wire (from porsche thermoswitch harness) is going to pin 33 on C2 "High speed cooling fan relay control".

The brown/yellow wire is going to pin 41 on C1.. this was supposed to be reprogrammed as low speed fan relay control.
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Wiring

Post  fliermike45 on Fri Jun 29, 2012 5:50 pm

"Fan relay control" I believe are the high and low fan speed triggers FROM the PCM to the fan relays.
Need a GTO Guru to identify the fan trigger connections.

Where is the "Porsche thermoswitch located"

There is lots of info in other threads on this site that address the fan wiring and how the PCM connects to the relays.

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Re: cooling fans always on

Post  948inVA on Fri Jun 29, 2012 5:57 pm

Found the problem.. I had told Eric to program low fans on pin 42, and somehow had used pin 41 in my wiring notes. So I moved the wire to pin 42 and everything works! Engine runs great and fans seem to be working normally..
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Re: cooling fans always on

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