P0645 will set when the powertrain control module (PCM) or one of the other supporting control modules detects abnormal signals in the A / C clutch relay control circuit. If you are experiencing issues with your AC system and suspect that your AC relay has either failed or is beginning to fail, we recommend having it diagnosed by a professional technician. If no voltage is present, something is stopping it. If you begin to notice that the AC system is not blowing as cold as it used to, then that may be a sign that the switch has failed, or is beginning to fail. P0647 HYUNDAI Air Conditioning Clutch Relay Circuit High. If so, then jump power to the clutch coil at the relay connector. But first things first, compressor is not running. The most common symptom of a bad AC compressor clutch is a non-functioning air condition system in your car. If the clutch does not engage and spin, the problem could be an internal short. Symptoms of Wear or Failure of the A/C Relay Air conditioning compressor works intermittently (randomly): as the relay wears out, many times they will turn on the A/C compressor at random intervals. The clutch relay coil is supplied with +12V on one side, and grounded by the AC Amplifier (control module) to activate. A few days ago, the AC on my 05 OBXT-LT started working intermittently. A/C Compressor Clutch? 2. Symptoms Possible sumptoms of OBD code P0647 Pontiac - Engine Light ON (or Service Engine Soon Warning Light) Causes Possible causes of OBD code P0647 Pontiac When it works, the AC works well, nice and cold. If that's good, you need to measure the resistance across the coil itself. Check the "Possible Causes" listed above. AC compressor intermittent operation causing weakened or intermittent cooling performance. Check for voltage at the AC compressor clutch relay, located in the PDC. Turn the key on, turn the AC on and see if the fuse still fails. The PCM supplies a ground to do this. A/C clutch relay may also be referred to as A/C compressor clutch relay. Two red and one blue, One of the red wires is for the compressor clutch the other paired with the blue wire is for the thermal protection switch. During a period when it was engaged and AC functional, I charge system for 25 to 40 psi. The P0645 OBD-II trouble code is associated with the air conditioning (A/C) clutch relay control circuit. A replacement clutch, coil, and pulley (always replace them together) fixed the problem. As you can hear the clutch clunk if you still suspect the clutch is faulty you are testing for a mechanical wear issue rather electrical. There are two relays that are involved in sending power to the a/c compressor. The first relay is called "A/C control relay" and sends power forward when the a/c switch is turned on in the dash. Symptoms of a failing AC compressor clutch. Replaced the compressor, drier, expansion valve, - Answered by a verified Nissan Mechanic. Apr 7, 2021. mpagester09 said: I had an AC problem recently with my 'new to me' 2012 odyssey (100k miles) that was also intermittent. leave it sit for about fifteen to twenty minutes. May 13, 2013 (Edited) I have a 2002 Camry XLE 4 Cyl with 144K miles. After driving for a while, the light came back and cool air started to blow. Faulty Air Conditioning (A/C) Compressor Clutch Relay Air Conditioning Compressor Clutch Relay harness is open or shorted Air Conditioning Compressor Clutch Relay circuit poor electrical connection Faulty Air Conditioning Compressor Clutch Faulty Engine Control Module (ECM) | Signs of a Bad or Failing AC Compressor Relay. Roy. I'd recommend finding the A/C clutch relay, and test to see if the relay is being commanded closed by the PCM. If the PCM cannot control the A/C compressor clutch relay, its diagnostics will log a P0645 code. This is a fairly common failure item on Honda A/C compressors. AC CLUTCH COIL RESISTANCE TEST. . It is connected to a relay that lets the engine control module (ECM) or powertrain control module (PCM) activate or deactivate the A/C. P0647 KIA Air Conditioning Clutch Relay Circuit High. The way to test is to either have a 12v test light or a voltmeter and check that there is voltage at the clutch when the A/C is turned on. Possible causes of OBD code P0645 Honda . What's An AC Clutch? The AC Clutch relay in the PDC is supplied ground on pin 85 via a Dark Green wire from pin 1 on the PCM "A/C Compressor clutch relay control..this needs to go down to ground. then other problems arose that weren't worth it to me. AC clutch coil has 4 wires. Replied by Andy.MacFadyen on topic 2008 Honda CRV AC. The psi for the low side should be about 25 to 40. Clutch will not engage. I read the Horn Relay and AC Clutch Relay are fed by the same fuse, so if the fuse blows, you lose Horn and AC. HOW TO KNOW IF AC CLUTCH IS BADIn this video we will show you what should be ac clutch coil resistance of a good and bad ac c. The AC compressor will not have power and the AC system will not function. The most common symptoms of code P0645 are similar across all applications, and could include the following- . Check the front side of the clutch to examine its condition. Seems like pretty straightforward stuff. Intermittent AC on 2006 F150. Can anyone confirm where the clutch control relay is located as I'd like to test it and based on my research 4.2's don't have a a/c relay (magentic clutch relay) unlike other Toyota models. ACURA; Alfa Romeo . The symptoms im having are the same, but the part number they describe for the relay is completely different (im guessing because of the much later model) Im hoping that the problem is the same on my car as it seems a pretty easy fix. - 2014-2018 Silverado & Sierra Troubleshooting - GM-Trucks.com. High Voltage Detected At The AC Clutch Relay 1. This may be a possible indication that your AC holds a bad relay and it requires some repair. The easiest test method would to be to put pressure gauge (s) on the system and look for any pressure change when the clutch is activated. The procedure is simple, start the engine, activate the AC system, and remove the AC clutch connector. 3. Related repairs may also be needed. When the clutch switch has failed, it will usually produce a few simple symptoms to look out for. When the AC compressor relay has failed or is beginning to fail, it will begin to display symptoms that indicate it may be time for it to be replaced. The main symptoms of a bad or failing AC Pressure Switch include: Intermittent Air Conditioning; Air Conditioning Stops Working; Warm Air is Blowing; Strange Air Conditioning System Noises; To find out how to solve the problem, let's take a look at a more detailed list of the most common symptoms of a bad AC pressure switch. If it is not functioning properly, then the AC system will not be able to produce cold air correctly. I reset the Engine warning light . Jake we took it to the dealer they changed the compressor and Ac works again. Is there ac relay somewhere I have several relays in the fuse box but they say rad fan relay. P0647 MINI Air Conditioning Clutch Relay Circuit High. Your air conditioner might run fine in one moment and then shut off instantly or produce erratic performance. If not, replace it. Normally, you will hear a click sound when the clutch is connected. Watch at proclaimliberty2000 how to fix your vehicle ac clutch relay and save money.Disclaimer: Under no circumstances will proclaimliberty2000 be responsibl. Feb 4, 2009. Depending on the vehicle and the specific malfunction, this code can be set up to eight times before the check engine light comes on. Inconsistent cooling. Connect a positive (+) lead from the battery to terminal 3 (MG+) and check that the following occurs: 1) the magnet clutch assembly operating sound can be heard, and 2) the magnet clutch hub and rotor lock. 1. Possible sumptoms of OBD code P0645 Honda - Engine Light ON (or Service Engine Soon Warning Light) Causes. If you turn on your ac and hot air comes out of the vents, there's something wrong. I did all the recommended checks and everything checked out good except the clutch gap. If you fail to hear this clicking sound, it is an indicator that the compressor is not getting enough power as a result of a failed relay. Then all of a sudden the Engine light came on but AC has been working. AKA "Fuse Box," right next to the horn relay. P0647 JEEP High Voltage Detected At The AC Clutch Relay. The P0647 OBD-II trouble code is associated with the air conditioning (A/C) clutch relay control circuit. Faulty AC compressor clutch relay Incorrect air gap on the clutch (assuming it has power) The Honda AC thermal protector must show continuity for the AC clutch to engage. Symptoms. The FSM states the voltage at the MGC terminal of the module (pin 21, a green wire) should be 10-14 V with the clutch off and < 1.0 V (grounded) with the clutch energised.. Just replaced my AC clutch last month. When the clutch is disengaged, the compressor will not turn on. Also, find out whether the clutch and the pulley are spinning. Rust accumulation on clutch plate and pulley or incorrect air gap. Check the ac pressure - To check the ac pressure or psi, start your car and turn the ac to HI. Poor air conditioning performance. Measure the voltage coming to the connector with a multimeter, and if everything is activated properly, you should see 12 to 14 volts coming to this wire. You'll hear a quick blast of the horn when it starts. Jumper pins 3 and 5 of the AC clutch relay and clutch would engage and AC blew cold air. Clutch is slipping and not providing maximum refrigerant compression. Chrysler P0646 Air Conditioning Clutch Relay Circuit Low. my 97 was very similar issue initially same symptoms and was the dash controls. Agreed the compressor is not running. Error Code P0645 is defined as A/C Clutch Relay Control Circuit, meaning there's a problem in the A/C clutch relay control circuit, likely caused by a defective A/C compressor driver or control relay. This test works with the engine off so there is no risk of running the compressor with low refrigerant. When the Air Conditioning (A/C) switch is pressed, the Heating, Ventilation, and Air Conditioning (HVAC) control module sends an A/C request message to the Engine Control Module via serial data.The ECM then grounds the A/C compressor clutch relay coil control circuit, closing the relay contacts. If it's really cold (like -40) the AC won't run. Two are on top and out of that top 2 one is power (red color; middle wire from 3 pin connector) and second green color go to earthing.Check continuity between two wire.if You will find ok continuity then clutch is ok and it will engage you can verify by give direct power from battery to If there is a ground wire, you should also check the ground. If you're experiencing problems with your AC system and suspect that your AC relay has either failed or is getting down to fail, we tend to recommend having it diagnosed by a knowledgeable technician. When the Powertrain Control Module (PCM) or one of the other supporting control modules has detected improper signals within the A/C clutch relay control electrical circuit, code P0645 will be set. Possible sumptoms of OBD code P0645 Chrysler . When a relay is starting to fail, it may give weakened or intermittent power to the compressor, which will result in weakened or intermittent function of the AC. Ive read this was a problem for a lot of 2003 camrys and the fix was to replace the AC magnetic clutch relay. It runs the various lights of the car, rad fan etc, but it will also energize the clutch at some point, regardless of system pressure. Labor costs are estimated between $181 and $228 while parts are priced between $398 and $402. Should be between 3.15-3.45 Ohms. 842 Dislike Share If you own a Honda CR-V between 2002 - 2008 then you will encounter a common problem with the AC compressor clutch not engaging properly due to the location and overheating of. Weakened or intermittent cooling performance. The first symptom which can answer the question "how to tell if AC pressure switch is bad" is the fluctuation of compressor. This range does not include taxes and fees, and does not factor in your specific vehicle or unique location. The AC compressor clutch is a small part of your AC system, but it can cost a lot of money to replace it. dash controls go through the ecm at some point with signals from the low and high side to give the ecm the ok to trigger the ac clutch switch relay to trigger the clutch. 3 (MG+) - Body ground 20 C (68 F) 3.8 to 4.2. On average, you're going to have to pay somewhere between $600 and $670 to replace your AC compressor clutch. The air conditioning compressor control relay switches the compressor on and off when necessary to maintain the ideal interior cabin temperature. Over time, the relay wears out and needs to be replaced to make use of the AC system. A/C clutch relay circuit is monitored when ignition is on and battery voltage is greater than 10.4 volts. AC blows warm. 0. Here are the steps: 1- Buy a diode, the biggest you can find. If the display is blank, the A/C will run. Fullsize Truck & SUV - 2014-2019 K2XX Platform. The AC thermal protector is located on the compressor. The blue wire leads to the multiplex unit. Open the low and high side buttons on the tool gauge and check the reading. AC compressor clutch won't engage. Search for: Search . Ac compressor problems. Intermittent Air Conditioning Nissan Mechanic: . Power for this relay comes from breaker F1-B, 10 amp. Clutch control assemby - the electronic part of the end of the compressor (500). The Diagnostic Trouble Code (DTC) when the PCM grounds the Air Conditioning Clutch Relay circuit, excessive current draw is detected on the Air Conditioning Clutch Relay circuit; or, with the Air Conditioning Clutch Relay circuit not grounded by the PCM, voltage is not detected on the Air Conditioning Clutch Relay circuit (the PCM expects to det. A/C clutch relay may also be referred to as A/C compressor clutch relay. This is actually the second time this has happened. AC clutch would engage intermittently this Spring. If the pulley and the clutch are both spinning it shows that the clutch is engaged with the pulley correctly. AC clutch screeches. We carry replacement relays from trusted brands like Duralast, and economical options like Valucraft. Visually inspect the related wiring harness and connectors. This is because the electrical contacts inside the relay may not be totally worn, but they do not have a good connection. At the same time pin 86 on the AC clutch relay has +12 volts suppled via fuse 15 (10 A) in the Junction Block. There are a few signs that the ac compressor clutch is failing or has gone bad. If you follow the wiring from the A/C compressor there should be a plug with three wires. In most cases, the AC compressor clutch is controlled by an . A/C clutch relay circuit is monitored when ignition is on and battery voltage is greater than 10.4 volts. This is a generic trouble code, meaning it applies to all vehicles equipped with the OBD-II system. You need to get a multimeter and unclip the connector that is sitting right on top of the alternator. Here is the thing, if the AC clutch relay is stuck closed, it forces your AC to stay on and this drains your battery fast. I think I found the problem (bad relay), but I wanted to get some feedback here. Based on the vehicle and the specific . They can fail in . P0647 SUZUKI Air Conditioning Clutch Relay Circuit High. Check the front of the compressor clutch. 4. When It Is Not Getting Cold Enough Another AC pressure switch symptom is not getting cold enough. If there is 12v at the clutch and the clutch is not engaging then you have a bad clutch. 2. Bad clutch coil or improper air gap. The idea is to install a flyback diode in parallel of the AC clutch on the AC compressor. A/C clutch relay may also be referred to as A/C compressor clutch relay. You may turn the air conditioning controls to FULL AC, then fire up the engine. Identify the positive terminal in the vehicle wiring connector - this can be done with a multimeter or test light. When the clutch is engaged, the compressor will turn on and start compressing the refrigerant. The AC compressor clutch will cost more than $400, while the labor associated with AC compressor clutch replacement will run you . A/C clutch relay circuit is monitored when ignition is on and battery voltage is greater than 10.4 volts.
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