Checking the operation of a fan relay on your vehicle is an easy procedure. Fig 1; SSR bench test wiring diagram for a DC input / AC output SSR “Since the voltage and current produced by a multimeter is not sufficient enough to turn on the SCRs, the output of a solid state relay will remain in the off state; even with the input signal applied.” The same test setup can also be How to Test a Relay. Procedure. This is because, thanks to the information as mentioned earlier, you are more knowledgeable about the radiator fan as well as how to use a multimeter … 4. In this post, I am going to teach you how to test a relay with a multimeter . The cooling fan relay is the relay that controls the engine’s cooling fans. If there is continuity, replace the relay. TEST 3: Making Sure Both Fan Motor Relays Are Getting 12 Volts. To test continuity, all you have to do is stick 2 terminals on your multimeter against 2 ends of an electrical current. Engine Cooling Fan Issues. You will receive a link and will create a new password via email. Turn the ignition to the "ON" position and jump terminals 87 and 30 the relay is now jumped and the accessory should activate, if so the relay has failed. Here’s how to test the radiator fan fuses with a multimeter. Check the multimeter for a 0 reading to know the relay still functions. Take your multimeter and set it to ohms. TEST 1: Testing The Amperage Draw Of The Low Speed Radiator Fan Motor. if fuse OK switch the relay with the horn relay and test again. TEST 4: Bypassing The Low Speed Fan Motor Relay. MVB-137 will show you some AC system status/request info. Disconnect the negative battery terminal. How To Test A Relay With A Multimeter. Power Probe II will power up the relay, while the multimeter will test for continuity (ohms). If there’s an issue with the relay, the fan will be affected. ; If the multimeter does not beep, the coil is open & damaged.The relay needs to be replaced. Example: Testing the radiator cooling fan relay, the cooling fan should be operating. When the probes part the screen should read 1 or OL, also known as open circuit. Remove the cooling fan relay. The fan relay controls the power to the cooling fan. Multimeter and leads with alligator clips. Importantly, always make sure the tip of the thermocouple is directly in the pilot flame. These scales determine how much current the multimeter will use during the test. How do I test to see if the radiator fan relay is getting power or a signal. If your multimeter still doesn't show continuity, then the radiator fan relay … Just keep in mind that many modern cars use electronic relays. Look at the readout on the multimeter’s screen to see if it reads 0, meaning the circuit has no … 2. The Fastest Way to Test a Fuel Pump Relay or Other Automotive Relays. These steps only apply to electro-mechanical relays, which contain a coil and contact points as main components. The fan should 'ramp-up' from 0 to 100% and back to 0% speed. Take a resistance reading on the relay as follows: Terminals "30" to "87" - … The purpose of testing a relay is to find, whether it is good or bad . CASE 2: Your multimeter DID NOT show continuity.Recheck all of your test connections and retest. For example, my multimeter has scales for 200 ohms, 2 K ohms, 200 K ohms, 2 … Where To Buy The Radiator Fan Assembly And Save. Check/replace the radiator fan relay, which is usually located in the under hood fuse/relay box. The terminals are usually labeled on the case of the relay. Using a test light connect the lid to NEGATIVE and start the engine with A/C on.back probe the positive terminal on the fan.If no power test the fuse. Test your multimeter is working by pressing the probes together. Hello friends I'm having a jaguar xtype problem 2002 I bought the new model fan module 941.0138.01 940009402 and the adapter cable C2S46951, the motor of the fans continued the old, everything fit perfectly but the fans were turned on even with the cold car, I noticed that the adapter it receives two wires of the module but in the adapter cable goes a pro fan wire so I imagine that the … I have checked the relay and it's good. Once you locate the relay, you have three methods to test it. If you prefer to do some of the work yourself, you can actually troubleshoot a cooling fan to see where the problem lies and how to fix it. If no power is observed at either 87 or 30, the fusible link or maxi fuse has shorted. the millenia fan system is controlled by the pcm. In this article, we will show what resistance readings you should get when you measure various points of a relay. 1. To test a relay to see whether it is good or defective, the simplest way to do would be to use a multimeter set to the ohmmeter setting and measure various resistance values of the relay. Take the black multimeter standard test lead and touch the white wire with it. If the fan does not operate check the Measuring Value Block(MVB) Group 135, field 2 will show you in (%) the current fan output speed from the ECM. The Relay in the TIPM (K11) labeled “Radiator Fan Low” The dual relays over by the brake master cylinder labeled “Fan Relays” on the internet (Mopar Part 56055666AB) The lack of a P069X style code being thrown led me to believe this was a unique problem with only the “high” speed part of running the fan. 1. pcm gets info from the coolant temp switch, in the block. There are typically a few spots where the problem is originating from, such as the fan motor, thermo switch, wire, or relay. The multimeter screen should read 0.00 also known as short circuit (inexpensive meters may read close to this from resistance of their leads). Please enter your email address. After doing some research, I have done the following. Faulty wiring could be to blame. I checked the radiator fan by turn the a/c on and max the fans out the radiator fans will not turn on. It may cause the fan to cut in and out, or not come on at all. We use cookies to give you the best possible experience on our website. Testing continuity in a wire, current, or fuse is a good idea if you’re installing or repairing any electrical components in an outlet, fuse box, car, or appliance. Reinstall the Radiator Fan Main Relay. How to Test a Thermocouple with a MultiMeter. Choose the most convenient. Make sure that the motherboard isn’t connected to any power source before you begin doing this. To be a little more specific: We're gonna' jumper terminal number 72 and terminal number 74 of the relay socket in the Power Distribution Center (under-hood fuse box). if the a/c is turned on, this overrides the temp sensor, and pcm turns on both fans. The most important thing to look out for if you want to test a capacitor with a multimeter that is still connected to the motherboard is the space. Bought a new temperature sensor from eBay. 2. By far, the easiest way to test a suspect fuel pump relay — or some other automotive relay — is to swap the suspect relay … IV. hi negative (goes to ground on M/T, switched on/off to ground by the 5th radiator fan relay LO2 on A/T) = blue/green So, I'd wire the 12v wires for both the high and low fan circuits together. Lost your password? It's easiest to use a Power Probe II, in conjunction with a multimeter. Check the fuses one by one. When the circuit inside the relay has power, the prongs should not have any resistance between them. And one of the best ways to do this is to use a multimeter with an ohmmeter setting and then measuring the resistance values. Set the multimeter to the "Ohms" setting and test the continuity of the relay's power terminals. The white wire is called the run wire. The multimeter should have an infinite, or "OL," reading. If you test the thermocouple with the multimeter and you get a reading above 25, then you have another issue. TEST 2: Testing The Amperage Draw Of The High Speed Radiator Fan Motor. If the car is already hot, should it be - Answered by a verified Jeep Mechanic. You have to check the voltage of a few fuses in the under-dash fuse box (number 3, 15, and 20) and under-hood fuse box (number 47 and 50). On applications that have variable fan speeds; the engine may also overheat if fan speed fails to increase when additional cooling is needed. In this test step we're gonna' apply battery power to the low speed circuit of the radiator fan motors by bypassing the low speed radiator fan relay with a jumper wire. ; Place the probes of the multimeter on the coil terminals; If the multimeter beeps (or show any sign of continuity), the coil is electrically closed (good). Defective fan relay. CASE 1: Your multimeter showed continuity.This test result tells you that the radiator fan relay is good. Set the multimeter in continuity test mode. if a/c is not on, the temp switch sends input to the pcm, and the pcm then decides when to trip the relay, which then powers the fan. A wiring issue. Radiator Fan Motor Test Basics. Then, wire those to the relay coil so that anytime either the high or low circuit sees power, it will trigger the relay. How to test a capacitor with a multimeter on a motherboard? Troubleshooting Your Radiator Fan . Test If Your Radiator Fan Has Actually Failed The most … A fan failure; or a failure of the fan relay or control circuit is bad news; because it can allow the engine to overheat. Based on the above information, you can now successfully run a test on your radiator fan with a multimeter. You should be able to conduct an Output Test with the ECM (key-on, engine-off). How to Test a Fan Motor With a Multimeter Test the first set of wires: Now is the time to test the white – brown and white wires. Multimeter’S screen to see if it reads 0, meaning the circuit inside relay. To 0 % Speed the car is already hot, should it be - Answered by a verified Jeep.. You some AC system status/request info be affected the test take a resistance reading on above... 'S good showed continuity.This test result tells you that the radiator cooling fan should 'ramp-up ' from 0 to %! The continuity of the relay and it 's easiest to use a.... 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