Ac pressure switch wiring diagram - If the a/c on your car isn’t running, the first step is to look if the compressor runs while the switch on the a/c and the engine. In case you discover an ac compressor gained’t run state of affairs, follow those diagnostic steps to find out what’s incorrect. You’ll want a virtual multimeter and a wiring diagram or components locator to locate the high and coffee stress switches.
Locate the compressor take hold of relay and take away it from its socket. Connect the negative meter cause battery bad terminal. Probe the relay socket terminals to locate battery power at terminals 2 & 3. If you don’t see battery voltage on each terminals, test the fuses and wiring to the relay. If you have battery power on each terminals, join the high-quality cause terminal 3 and the bad result in terminal 4. You have to see battery voltage. If you don’t, the pcm isn’t supplying ground to the relay control coil, flow to step 3.
The pcm will not offer floor to the compressor relay if the device is low on refrigerant or the pressure within the gadget is just too excessive because of a blocked condenser, horrific orifice tube or tmx valve. Locate the low pressure and excessive stress switches. With meter nevertheless set on dc volts, disconnect the electric connector on the low stress switch. Join the effective result in one terminal and the poor cause the alternative terminal. Begin the engine and turn the a/c to max. Look for voltage on one of the two terminals (five). In case you see volts, meaning the pcm is supplying power. Do the equal test on the excessive pressure transfer five). Of strength is present at each switches, conduct a continuity test across the transfer contacts step 4.
You do no longer want to leap any wires at the stress sensor. Your compressor is laptop controlled and this will no longer be performed with out probable unfavorable the ecm. If you ought to pressure activate compressor. You best have a pair options. Find the energy twine on the compressor and tap into it with a 12 volt jumper or discover the ac compressor relay within the under hood fuse field relay r11.
Engine off. Disconnect the electrical connector at compressor grab. Set meter at dc volts. Join fine result in one terminal in snatch electrical connector (1) , negative result in battery ground. Begin engine with a/c turned to max. Look for battery voltage on meter. If voltage is 0, circulate effective result in the alternative terminal in electrical connector. If nevertheless zero, continue to step 2.
In case you see battery voltage on one terminal, depart the lead in that terminal and pass the poor result in the opposite terminal. In case you see battery voltage with each leads linked to the electric connector, that confirms the compressor take hold of is getting strength and ground. That means the grasp coil is awful. Some clutches are replaceable, others aren’t and also you have to replace the whole compressor.