AC not being commanded
I swapped my car to an LR4 and I wired it like the 99 F-car for the AC. So when you apply 12VDC to R17 it should bring pin R34 (I may be getting the numbers wrong since I don't have the book in front of me) low to enable the relay. If I jump the wires at the relay to work the compressor (I have the wire split for the compressor to go back to the ECM for compressor status) the compressor comes on and fan 2 comes on, as it should.
This ECM was for the LR4, but I re-flashed it to a 2002 manual Camaro tune, so the tune should match how it is wired. Anyone have any ideas? I double checked that I am getting 12VDC to the request pin and all the other wiring for the relay. |
Did you try jumping the pressure sensor/switch?
I think its pin 43, not 34, for relay ground from pcm. And you don't have the ground signal, correct? Quote:
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When I have the 12VDC on the request pin I do not have ground continuity on pin 43 for the relay. |
Nah I meant unplug the sensor and jump with paperclip. Is the system charged?
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System isn't charged yet, I wanted to make sure it worked before I brought it to Josh. I basically equalized to the ~110psi of the compressor, so it should mimic being "charged", no? |
Jump the plug of the low side switch. That way low side isn't seeing too low of a pressure and preventing compressor from engaging.
I've never done what you are attempting, I'd say grab a can or two of over the counter stuff but you are r12 so that won't work. If the low side switch is bypassed, you shouldn't have to worry about having enough psi to fool system and you won't have to worry about high side hitting cutoff obviously. |
I guess I see where you're going. 4th gens only have one switch though, on the high side. But maybe I am not getting enough compressed air into the system to hit that 30PSI mark.I wish I knew what the actual mV readings were. I guess this new aftermarket switch I bought could be a POS right out of the box.
That was my thought too that the system needs to see some pressure before it will kick on. |
Oh wait, its only one and its a sensor? Because my cliff notes say, "The A/C refrigerant pressure sensor is above 2826 kPa (410 psi ) or is less than 207 kPa (30 psi )." so its not as simple bypass and fool. I think you should just charge it :nod:
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This does bring me into my next question, my reverse lockout isn't being commanded by the ECM either, I mean I don't think it is. I am getting an error code for it, and I haven't gotten under the car to make sure I have 12VDC at the solenoid. The fuse I added looked fine, so I don't think that's it.
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Looks like stock the fuse is hot in run and start, feeds one side of noid, pin 44 c2 grounds internally in pcm. Maybe rig up a switch and try manually operating it?
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charging it seems to be the best bet lol
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Over here at JSP. Looks like I connected the wire to command the AC to the wrong wire on the HVAC controls. Disconnected the wire from the connector and jumped it to+12vdc and the AC was commanded as it should be!
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Nice man!
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