Ok I have a 1993 Toyota tercel and on my wiring to the stock ECU on the 16 pin plug I have 3 pins I am not sure if I need to connect them to the MS II 3.57.
The pins are:
6 AC2 12v power to aircon computer
14 ACT A/C Cut Control System
15 AC1 A/C Switch Signal System (12v to Aircon Computer)
Should these be connected for the a/c to run properly?
If so How would I go about doing that?
Thanks,
Billy
Megasquirt and A/C
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Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0).
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
The full forum rules are here: Forum Rules, be sure to read them all regularly.
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Matt Cramer
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Re: Megasquirt and A/C
Not 100% sure but most Toyota A/C systems work fine on their own without being connected to the ECU.
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poordude2151
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Re: Megasquirt and A/C
If I was to have to run these to the MS how would I do that?
Re: Megasquirt and A/C
On my Toyota, when the AC is on, the idle is kicked up a couple hundred RPM. So...
I would hazard a guess that a FIDLE circuit would be appropriate. Should be the only reason the ECU knows the AC is on.
I would hazard a guess that a FIDLE circuit would be appropriate. Should be the only reason the ECU knows the AC is on.
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Matt Cramer
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Re: Megasquirt and A/C
You wouldn't.poordude2151 wrote:If I was to have to run these to the MS how would I do that?
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poordude2151
- MegaSquirt Newbie
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Re: Megasquirt and A/C
So another words I wouldn't be able to if I had to for the A/C to work?
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Matt Cramer
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Re: Megasquirt and A/C
The MegaSquirt does not control A/C with current release firmware. You would need to devise an alternate means of making the A/C work. As automotive A/C has been around a lot longer than workable EFI systems, it's not like you need anything very complicated, a few relays at most.
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drmiller100
- Helpful Squirter
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Re: Megasquirt and A/C
AC can be REALLY simple, or stupidly complicated.
ultimately, to make the AC come on, all you really have to do is energize the compressor clutch with 12 volts.
You might cycle that clutch to keep the inner evaporator (core under the dash which makes the air cold) above a certain temperature so that it does not ice up.
Or, you can just watch the pressure on the low side to keep the low side pressure above a certain point (more common.)
ultimately, to make the AC come on, all you really have to do is energize the compressor clutch with 12 volts.
You might cycle that clutch to keep the inner evaporator (core under the dash which makes the air cold) above a certain temperature so that it does not ice up.
Or, you can just watch the pressure on the low side to keep the low side pressure above a certain point (more common.)