Ok guys i have an 00 integra ls supercharged , my compressor kicks on at idle but when i begin to drive anything over idle it blows hot air... now we checked the gauge and it looked good ...i plan to leave lines connected and test drive the car to see if pressure changes... any ideas

 

Are you saying the A/C works, [A/C compressor clutch engages] but the A/C clutch does not engage when driving, or are you saying it engages but you do not get cold air?

What gauge did you check that "looked good"?94

 

sorry it took so long... Now the clutch doesn't engage at all.. I tested the relay and it had continuity the relay block in pin 4 and 2 have 12 volts... when i jump one relay block one and two the clutch engages... test both wires blk/red and blu/ red on ecu for voltage... still no a/c

 

If the clutch engages when you jump the relay terminals, then reinstall the relay and find and unplug the A/C pressure switch and jump it, if clutch engages and A/C blows cold air, replace the the pressure switch, if A/C does not blow cold air you have a low A/C refrigerant charge. 94

 

I when the relay is in place the clutch doesn't come on even if i jump the a/c pressure switch on the condenser fan comes on... The charge is perfect hooked up gagged and all numbers are good

 

I will assume English is a second language for you because your last post is very hard to understand.

So I understand, are you saying...

If you jump the compressor clutch relay, the compressor clutch will engage, is that correct?

If you jump the compressor clutch relay with the engine running, [and A/C switch on] do you get cold air from the vents and does the condensor fan turn on?

If the engine is running with the A/C switch on and you jump the pressure switch, the compressor clutch does not engauge but the condensor fan does turn on, is that correct?

Please answer with a yes or no to all three (3) questions. 94

 

yes,yes,yes. I think the issue is my 31 pin harness white and red number five pin is putting out only 1.5 volts instead of 12v... I will check the wire all the way back to the ac diode... When i applied 12v to that wire it turned on compressor and cycled but didn't raise my rpm.

 

Ok so i came to the conclusion i need to test my ecu... after testing everything that on demand 5 requested , all looks good but ac is not working .

1: tested clutch relay for continuity, checked ok
2: tested relay slot pin hole # 4 for 12v, checked ok
3: tested relay slot pin hole # 2 for 12v, checked ok
4: jumped relay slot pin hole #2 and #1 , which engaged the clutch.. checked ok
5: test 32 pin ecu # 17 blk/red for 12v, test 31 pin ecu #5 blu/red for 12v... now this is the issue when i tested the 31 pin for 12v there was only 1.5v. But the wire was not blu/red but white/red... I looked it up and on the 99 integras pin C5 blu/red, but 00-01 the blue/red wire is A27. When i measure voltage is 12v.. SO ONLY STEP LEFT IS ANOTHER ECU.. ANY IDEAS GUYS

 

If everything else checks out then it has to be the ECU/ECM.

Try "rebooting" the ECU/ECM, disconnect the batt. NEG.(-) cable, leave it off for 15 min., reconnect ad try the A/C.

You can also plug in a OBD2 scanner and check A/C functions, and clear any codes. 94

 

Ok .. Ill try the battery disconnect.. My question i have hondata s300 v2 if ecu is bad in that section for some reason can it be transferred to different ecu? Also since im supercharged can i put a stock ecu just to try the ac without harming anything even though the charger is there? or look for a chipped ecu with a basic charger program and try that

 

I can't see installing a stock ECU/ECM just to test the A/C would hurt anything, you do not need WOT to test the A/C, or even have the car in gear, idle will work just fine. 94

 

So as stupid as this may sound i figured it out.. if you have a hondata on your car and your a/c just decides to stop working.. check your chart and make sure your tps even if its stock and never been touched , its at 0%.. Mine was at 40% and that's why a/c did not work, changed the part and we are all good now