Best automotive air conditioning wiring diagram - If the a/c on your vehicle isn’t running, the first step is to look if the compressor runs when the turn on the a/c and the engine. In case you find out an ac compressor gained’t run scenario, follow those diagnostic steps to find out what’s wrong. You’ll need a digital multimeter and a wiring diagram or components locator to locate the excessive and coffee strain switches.
The pcm will now not provide floor to the compressor relay if the gadget is low on refrigerant or the strain inside the device is simply too excessive because of a blocked condenser, awful orifice tube or tmx valve. Locate the low pressure and high stress switches. With meter still set on dc volts, disconnect the electrical connector at the low pressure transfer. Join the wonderful cause one terminal and the negative cause the alternative terminal. Begin the engine and flip the a/c to max. Search for voltage on one of the two terminals (five). If you see volts, meaning the pcm is imparting electricity. Do the same test at the excessive stress transfer five). Of strength is gift at both switches, behavior a continuity check across the transfer contacts step four.
Engine off. Disconnect the electric connector at compressor take hold of. Set meter at dc volts. Connect positive result in one terminal in grab electric connector (1) , negative result in battery floor. Begin engine with a/c grew to become to max. Look for battery voltage on meter. If voltage is zero, circulate fine cause the alternative terminal in electric connector. If nevertheless 0, continue to step 2.
In case you see battery voltage on one terminal, depart the lead in that terminal and move the bad result in the other terminal. In case you see battery voltage with each leads linked to the electric connector, that confirms the compressor grasp is getting strength and ground. Which means the seize coil is terrible. A few clutches are replaceable, others aren’t and you need to update the complete compressor.
Locate the compressor grasp relay and remove it from its socket. Connect the bad meter result in battery negative terminal. Probe the relay socket terminals to come across battery power at terminals 2 & three. In case you don’t see battery voltage on both terminals, take a look at the fuses and wiring to the relay. If you have battery electricity on both terminals, connect the superb cause terminal 3 and the terrible result in terminal four. You must see battery voltage. If you don’t, the pcm isn’t presenting ground to the relay control coil, flow to step three.