E40 AC Pressure Sensor/Wiring?
E40 AC Pressure Sensor/Wiring? My swap is an LS2 with an E40 PCM. Unlike the older ECM's, the E40 AC request signal is generated by the BCM, which I'm not using. I bought a custom Ardunio module that will provide the necessary serial information to the E40. The Arduino module is effectively a "stand in" for the original BCM. This should allow the E40 to fully control the fan, boost the idle, provide high RPM compressor cutout, etc. In other words, it should be 100% as it was in GM factory application.
With all of that said, I will need to install a GM pressure switch somewhere in the system. In my notes, I have written that the GM pressure switch (part# 92145716)? should be installed in the line running between the drier/accumulator and the condenser. Is this correct? If so, is this the only pressure sensor/switch needed?
I'd like to have lines made this week and I need to make sure I'm making all of the necessary accommodations.
Thanks!
With all of that said, I will need to install a GM pressure switch somewhere in the system. In my notes, I have written that the GM pressure switch (part# 92145716)? should be installed in the line running between the drier/accumulator and the condenser. Is this correct? If so, is this the only pressure sensor/switch needed?
I'd like to have lines made this week and I need to make sure I'm making all of the necessary accommodations.
Thanks!
Last edited by TipsyMcStagger; Oct 24, 2018 at 09:20 AM.
And now I'll complicate things a bit; although my E40 and engine came out of a 2006 GTO, I had the PCM flashed to a 2006 SSR OS (so I can have cruise control). I have AllData acess for both the 2006 GTO & SSR.
I'm surprised to see that the pressure sensors are different parts numbers. The GTO sensor is 92145716 and the SSR is 22664328. I found an old post - quoted below - which indicates that 22664328 was used '98-'02 and 92145716 was used in '06 and later, but given that the SSR is an '06 and uses 22664328, that doesn't seem to be entirely accurate.
Does anyone know what the differences are between the two sensors? I'm inclined to use the part number that aligns with the OS flash that's on my PCM (SSR OS) but I'm really just guessing.
EDIT: According to Rockauto, GPD 1711438 is interchangeable for both 92145716 & 22664328.
And why stop there with the convoluted questions? I also noticed in AllData that the SSR has an additional sensor not used on the GTO; a "Pressure Cycling Switch" part# 89040362. I can't find this switch anywhere in the schematic.
Any idea what it is and if I need to worry about it?
I'm surprised to see that the pressure sensors are different parts numbers. The GTO sensor is 92145716 and the SSR is 22664328. I found an old post - quoted below - which indicates that 22664328 was used '98-'02 and 92145716 was used in '06 and later, but given that the SSR is an '06 and uses 22664328, that doesn't seem to be entirely accurate.
Does anyone know what the differences are between the two sensors? I'm inclined to use the part number that aligns with the OS flash that's on my PCM (SSR OS) but I'm really just guessing.
EDIT: According to Rockauto, GPD 1711438 is interchangeable for both 92145716 & 22664328.
And why stop there with the convoluted questions? I also noticed in AllData that the SSR has an additional sensor not used on the GTO; a "Pressure Cycling Switch" part# 89040362. I can't find this switch anywhere in the schematic.
Any idea what it is and if I need to worry about it?
Last edited by TipsyMcStagger; Oct 24, 2018 at 03:17 PM.
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No cycling switch because the compressor is a variable as opposed to a fixed.
A pressure sensor is a pressure sensor is a pressure sensor. As long as it works why are you worried about the part number? GM supersedes numbers all the time.
A pressure sensor is a pressure sensor is a pressure sensor. As long as it works why are you worried about the part number? GM supersedes numbers all the time.
Thanks for the feedback. Always appreciated.
I'm guessing the OE SSR system used a fixed displacement compressor? If so, will the SSR OS settings be okay as they are for use the fixed displacement Sanden compressor?
Last edited by TipsyMcStagger; Oct 25, 2018 at 05:38 PM.
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I don't feel the need to apologize for my lack of experience. I assume you weren't born knowing all of the answers either.
I appreciate the input from those who are here to help.
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Staging Lane
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I don't know about GM's ECU/OS, but in Dominator ECU, we need to plot the curve for the pressure sensor (volt vs pressure), so knowing the part number and its corresponding voltage/pressure curve helps.
If the SSR came factory with a fixed displacement compressor and had a pressure cycling switch as part of that system, will I have issues running the Sanden fixed displacement compressor with the SSR OS without the pressure cycling switch?
Is there a setting in the OS that can/needs to be adjusted?
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There are pressure sensor settings for fan on/off, etc but basically the system is 0-5 volts and it's scaled at 0-500psi at least that's what I remember when logging the data. The on/off pressures are a little different from a variable and a fixed but it will work fine. What I have found is that the pressure sensor really never turns on the high fans because they are set in the 325-350psi region and if you have dual with a low speed it's enough airflow to do the ac job no matter how hot it is. Secondary to that is if you modify the high fan temps to say 210-215 it will most likely kick those on from the coolant temp first.
Put a cycling switch in if you have a fixed compressor.
Put a cycling switch in if you have a fixed compressor.
Last edited by 69 Ghost; Oct 27, 2018 at 02:55 PM.
There are pressure sensor settings for fan on/off, etc but basically the system is 0-5 volts and it's scaled at 0-500psi at least that's what I remember when logging the data. The on/off pressures are a little different from a variable and a fixed but it will work fine.
What I have found is that the pressure sensor really never turns on the high fans because they are set in the 325-350psi region and if you have dual with a low speed it's enough airflow to do the ac job no matter how hot it is. Secondary to that is if you modify the high fan temps to say 210-215 it will most likely kick those on from the coolant temp first.
What I have found is that the pressure sensor really never turns on the high fans because they are set in the 325-350psi region and if you have dual with a low speed it's enough airflow to do the ac job no matter how hot it is. Secondary to that is if you modify the high fan temps to say 210-215 it will most likely kick those on from the coolant temp first.
The Sanden SD7B10 I'm using is a fixed displacement compressor. Seemingly, the OE SSR compressor was fixed displacement as well.
Where in the system would I place the cycling switch? I've looked at the SSR wiring diagram and I don't even see the pressure cycling switch depicted.
Thanks very much for the continued discussion.
Last edited by TipsyMcStagger; Oct 28, 2018 at 09:37 AM.
The factory BMW compressor was a Denso 10PA17C, which I believe is also a fixed displacement compressor.
The label on the Denso compressor has a Low Side and High Side pressure rating of 1.67 MPa and 3.53 MPa, which equate to approximately 242 PSI & 512 PSI, respectively.
There is a high-pressure switch in the original BMW system (that I'll replace with the GM pressure sensor) but I don't see a cycling switch anywhere.
I have a custom made Arduino module that will send the required serial A/C request signal to the E40, so the goal is for the E40 to have full control of the A/C system and fans.
Last edited by TipsyMcStagger; Nov 2, 2018 at 06:38 PM.
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Based on my experience with BMW's it probably has a TXV valve. If so it will have a temp probe on the evaporator that controls the cycling. You need to find the wiring for the Beemer and tie into that as needed.
Teching In
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Can you tell me where you got that module? I'm having a similar issue. Thanks.
EDIT: I think he's @Thaniel on LS1Tech as well, but I don't think he's very active here.
Last edited by TipsyMcStagger; Aug 19, 2019 at 11:39 AM.
Interesting. I didn't know that. Is there a thread about it somewhere? Is Thaniel no longer doing any Arduino work?
I never followed his E46 threads much but I know he was heavily involved in blazing the trail for CAN bus solution in those swaps.
I never followed his E46 threads much but I know he was heavily involved in blazing the trail for CAN bus solution in those swaps.