Newest Automotive Air Conditioning Wiring Diagram AC Compressor Won'T Run - Ricks Free Auto Repair Advice Ricks Free - Engine off. Disconnect the electric connector at compressor clutch. Set meter at dc volts. Join wonderful result in one terminal in snatch electrical connector (1) , terrible result in battery ground. Start engine with a/c became to max. Look for battery voltage on meter. If voltage is 0, move wonderful result in the alternative terminal in electric connector. If nonetheless 0, continue to step 2. If the a/c to your automobile isn’t operating, step one is to peer if the compressor runs while the activate the a/c and the engine. In case you find out an ac compressor received’t run state of affairs, follow those diagnostic steps to discover what’s incorrect. You’ll want a digital multimeter and a wiring diagram or elements locator to find the excessive and low strain switches.
The pcm will now not provide ground to the compressor relay if the machine is low on refrigerant or the stress within the machine is too excessive because of a blocked condenser, awful orifice tube or tmx valve. Find the low strain and high stress switches. With meter still set on dc volts, disconnect the electric connector at the low pressure switch. Join the fantastic result in one terminal and the negative cause the alternative terminal. Start the engine and flip the a/c to max. Look for voltage on one of the two terminals (five). If you see volts, that means the pcm is supplying strength. Do the same test at the excessive stress transfer five). Of electricity is present at each switches, behavior a continuity test across the switch contacts step 4. If you see battery voltage on one terminal, go away the lead in that terminal and pass the bad lead to the alternative terminal. In case you see battery voltage with both leads related to the electrical connector, that confirms the compressor clutch is getting strength and ground. Meaning the grasp coil is awful. A few clutches are replaceable, others aren’t and also you have to update the whole compressor.
Find the compressor grasp relay and get rid of it from its socket. Connect the terrible meter lead to battery terrible terminal. Probe the relay socket terminals to locate battery power at terminals 2 & three. In case you don’t see battery voltage on each terminals, take a look at the fuses and wiring to the relay. If you have battery electricity on each terminals, join the tremendous lead to terminal three and the terrible cause terminal 4. You must see battery voltage. If you don’t, the pcm isn’t providing ground to the relay manage coil, flow to step 3.