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Location:
Parramatta
Registered:
July 2002
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how does air con run?
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Tue, 07 January 2003 01:35
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I need to know how the climate control is controled does it have its own ecu or is it all controled in the main ecu the reason i ask this is because i have my computer piggy backed to ems and want to have ems stand alone i just want to know what i will loose here? the car is an sw20 mr2 i have looked at wiring diagrams but the text isnt very clear i need some help urgently plz?!
thx in advanced
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Location:
Parramatta
Registered:
July 2002
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Re: how does air con run?
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Tue, 07 January 2003 04:18
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ok i have now narrowed it down to this the only wire that the ecu contorls of the a/c is the magnetic clutch what the f$%k is that? where do i find it and what the hell does it do? plz help
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Location:
Canberra
Registered:
December 2002
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Re: how does air con run?
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Tue, 07 January 2003 04:27
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The magnetic clutch is found on the front of the compressor its there so the compressor does not run all the time and constantly drag power from the engine. I cant help you with any of the ecu stuff as i have only had experience with steam driven a/c units (figure of speech).
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Location:
Parramatta
Registered:
July 2002
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Re: how does air con run?
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Tue, 07 January 2003 05:35
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thanx for that Jason. If u could tell me how you would wire this up to an aftermarket computer (EMS is the computer dual sport II) so that it would work properly?
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Location:
Brisbane
Registered:
May 2002
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Location:
Parramatta
Registered:
July 2002
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Re: how does air con run?
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Tue, 07 January 2003 05:52
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norbie the only reason i worry is that the one wire it is on the orginal ecu which makes me think its there for a reason, but if its an on/off switch, i know ems has a/c control id assume i would just connect that wire up? therefore the on /off should work well in theroy
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I supported Toymods
Banned User
Location:
Brisbane
Registered:
May 2002
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Re: how does air con run?
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Tue, 07 January 2003 06:56
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I thought that when the aircon is on, the idle speed on the engine is upped a little?
Or is this just a load of crap I have heard?
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Location:
1st street on the right
Registered:
November 2002
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Re: how does air con run?
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Tue, 07 January 2003 07:07
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I think you're right, the ecu doesn't control A/c function, it's to tell the ecu that A/c is on and adjusts idle speed accordingly. I just cut this wire out of the harness in my conversion with no A/c, 5M-GE into MS-55. The cressida wiring diagrams show it as switched from A/c control and it shoud either power or earth the wire to the ecu.
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Location:
Brisbane
Registered:
May 2002
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Re: how does air con run?
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Tue, 07 January 2003 13:55
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Yes, most cars have an idle-up function which engages when the compressor is engaged. On older cars it's just a bypass valve which lets a bit of air around the throttle body, but I guess newer cars are a bit more sophisticated than that (ie an input on the ECU). I wouldn't worry about it though; it's really only important on cars with automatic transmissions.
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Location:
North Sydney
Registered:
May 2002
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Re: how does air con run?
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Tue, 07 January 2003 14:14
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On newer cars the engine ECU does control the ac compressor. It wont let it engage until the car is running for atleast 5 seconds, also realises when you have fully got your foot planted and are overtaking for example and disengaged the magnetic clutch for more power. Also turns off compressor in limp mode and when engine gets way too hot.
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Location:
Parramatta
Registered:
July 2002
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Re: how does air con run?
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Wed, 08 January 2003 01:21
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so is there anyway that i can still make this work properly without useing the factory ecu once again i do have the EMS system and i know its able to contorl air con. if there is some way can some one let me know how?! plz
thanx in advanced
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