Difficulty Scale: 4 of 10. Fuse 23 (20 A) of the Power Distribution Center. GM  |   The correct and expected test result is for the fan motors to run in low speed when both terminals are jumpered together. This test result generally lets you know that the fan motors are bad and that the radiator fan assembly needs to be replaced. Watch this video to figure out how to diagnose problems with the cooling fan relay on a Chrysler. Once activated the relay connects an electrical supply to a particular accessory. As an Amazon Associate, I may earn a small commission from qualifying purchases from the Amazon product links from this website. Radiator fan relay by Bob O'Neill and Bob Lincoln Because the radiator fan requires a high level of current, a relay, managed by the logic module, turns the fan on and off. Swop with suspect and will switch on whatever you want to test . Coolant boiling in the radiator's overflow tank and the radiator fan motor does not activate. Female terminal 74 should also have 10 to 12 Volts present with the key ON. Ford  |   The both fan motors should run in low speed. Fuse 12 (40 A) of the Power Distribution Center. The filter is mounted in a hot area and tends to fail, preventing the cooling fan from operating. Part 2 -How to Test the Radiator Fan Relay (Honda 2.2L, 2.3L) IMPORTANT: Do not jumper any other terminals of the relay socket than the ones indicated! Do NOT follow this link or you will be banned from the site! I have a spare relay for test purposes . It is your power distribution control. Jeep  |   If You Think The Problem Is The Cooling Fan Relay, Test It ! The results of your tests will help you troubleshoot the reason your Honda Accord's radiator fan motor isn't working. As an Amazon Associate, I may earn a small commission from qualifying purchases from the Amazon product links from this website. How do I test to see if the radiator fan relay is getting power or a signal. If the car is already hot, should it be - Answered by a verified Jeep Mechanic. Jumpering any other female terminals can damage the fuel injection computer. If the fan clutch requires repair, take the vehicle to a qualified mechanic. They are designed to only run when needed. To replace the cooling fan relay… Your Honda will not re-start (once it has overheated). Honda  |   Reply. CASE 2: Both fan motors DID NOT run. verrilli. But to be sure they're bad, you need to make sure that the fan motors are getting power and Ground. You can conclude that fuse 12 and fuse 23, of the Power Distribution Center, are OK (not blown). If 10 to 12 Volts DC are present at female terminals 71 and 74, then we can conclude that the fuses are OK and we can also conclude that female terminals 76 and 79 (of the high speed radiator fan relay) are also receiving this voltage. 2003 A4, AMB. How To Test The Radiator Fan Relay (Honda 2.2L, 2.3L), START HERE: The Radiator Fan Motor Relay Tests, TEST 1: Checking The Radiator Fan Relay Power Circuits, TEST 3: Bypassing The Radiator Fan Switch, TEST 4: Bench Testing The Radiator Fan Relay. All Rights Reserved. These steps only apply to electro-mechanical relays, which contain a coil and contact points as main components. Checking the operation of a fan relay on your vehicle is an easy procedure. I have closed the contacts permanently somehow Cover back on and marked so I know it's the test relay. Most modern vehicles use electric cooling fans to help pull air through the Your Jeep Liberty‘s radiator fan has one of the most important jobs on the vehicle.It is the last line of defense between you and an overheating engine. MVB-137 will show you some AC system status/request info. Take a paper clip and unbend it (or preferably make a short test jumper with male spade terminals on each end: like this), and insert one end into the White terminal of the Radiator Fan Relay socket, insert the other end into the White/Blue terminal of the same socket. The problem here is the cooling fan circuit uses a radio frequency filter mounted on radiator fan shroud. The next step is to apply battery power to the high speed circuit of the radiator fan motors. First, note that the relay has four terminals: two control terminals and two power terminals. CASE 1: Both female terminals (71 and 74) have 10 to 12 Volts. How to test Radiator Fan, Control Modle, or relay with VCDS Lite audi a4 / b6. Your multimeter should read 10 to 12 Volts DC. Reinstall the Radiator Fan Main Relay. The low speed and high speed relays get power from the same 2 fuses (see image 2 of 3). Your purchase helps support my work in bringing you real diagnostic testing information to help you solve the problem on your vehicle. This is very rare but a lack of 10 to 12 Volts at female terminal 71 generally lets you know that fuse 23 of the Power Distribution Center is blown. This is the correct and expected test result. If necessary, a replacement relay costs around $20.There are three ways to check for a bad terminal. Hot (+) only with Key On Engine Off (KOEO) or Key On Engine Running (KOER). Your temperature gauge will max out (as you're driving around). The next step is to apply battery power to the low speed circuit of the radiator fan motors. Circuit that channels the battery power to the radiator fan motor when the relay closes. Tools  |   Coolant (or water) boiling in the radiator's overflow tank as the engine runs or when you turn off the engine. Each terminal provides a specific signal. If the radiator fan is not working, it’s a serious problem.. Just because the radiator fan is not on does not mean that it is not working. Find a spot to secure the relay with a screw or a bolt. CASE 3: Female terminal 74 DOES NOT have 10 to 12 Volts. CASE 1: The amperage draw is under 40 Amps. If the radiator fan is not working, it’s a serious problem.. Just because the radiator fan is not on does not mean that it is not working. Battery power for the radiator fan motor. Printable View. This lets you know that the high speed radiator fan motor has failed due to excessive wear and tear. For more information about how to test a fan clutch, such as other signs to look for which indicate damage, read on. NOTE: Be careful when probing the female terminals of the relay socket with your multimeter test lead. Ground the black multimeter test lead on the battery negative (-) access point (on the left-side strut tower). They are designed to only run when needed. For this test go to: TEST 3: Making Sure Both Fan Motor Relays Are Getting 12 Volts. The cooler/ radiator fan driver relay is located in the black box just behind your drivers side headlight assy under the hood. The fan should 'ramp-up' from 0 to 100% and back to 0% speed. The logic module uses the temperature switch on the radiator for 1984 models; the radiator is turned on when the coolant temperature reaches 210 degrees and turned off when the coolant temperature cools to 180 degrees. Gently probe female terminal number 71 with the red multimeter test lead. You can follow the printed diagram on the cover to locate the relay you are in need of replacing. Locate female terminals #72 and #74 of the relay socket (see illustration 2 of 2). These accessories can range from the main computer PCM (powertrian control module), radiator fan, fuel pump, door locks etc. You can also conclude that female terminals 76 and 79 of the high speed radiator fan relay are also receiving these 10 to 12 Volts DC. © 2011-2020 Abraham Torres-Arredondo move your test light to the battery posistive terminal and test the dark blue / pink wire, if the test light turns on than you have a bad radiator fan relay, you can pick one up at your local parts store for about $85.00 just make sure you get a high quality one the cheap ones have a hard time with the amprege consumption of that fan. On most Chrysler vehicles, the cooling fan relay must be engaged before power can go to … Also, verify connectivity from the relay socket to the other connection on the fan … Terms of Use Save Share. This test result generally lets you know that fuse 12 of the Power Distribution Center is blown. If you have tested the amperage draw of the low and high speed circuits of the fan motors, then your next step is: TEST 4: Bypassing The Low Speed Fan Motor Relay. Remove the low speed radiator fan motor relay from the Power Distribution Center. ", Home  |   Since in this tutorial we're only troubleshooting the fan relay and its circuits, you'll find the radiator fan motor test here: How To Test The Radiator Fan Motor (Honda 2.2L, 2.3L). Your next step is to check the fuse and if it's blown, replace it with a new one (of the same rating). GM  |   Chrysler  |   TEST 3: Making Sure Both Fan Motor Relays Are Getting 12 Volts, TEST 4: Bypassing The Low Speed Fan Motor Relay, TEST 1: Testing The Amperage Draw Of The Low Speed Radiator Fan Motor, TEST 5: Bypassing The High Speed Fan Motor Relay, TEST 6: Making Sure The Radiator Fan Assembly Is Getting Power From The Low Speed Relay. 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). You should be able to conduct an Output Test with the ECM (key-on, engine-off). If the radiator fan motor relay fails, the most obvious symptom that your Honda Accord will experience is overheating due to radiator fan not coming on. This is the correct and expected test result. Your purchase helps support my work in bringing you real diagnostic testing information to help you solve the problem! Turn the key ON but don't start the engine. You'll also see one (or more) of the following symptoms: The radiator fan relay is located in the under-hood fuse box (see the illustrations in the image viewer). Copyright © 2009-2020 Abraham Torres-Arredondo All Rights Reserved. Power provided by fuse #4 (7.5 Amp) of the left side dash fuse box (see image 4 of 4). Easy step by step procedure to test an automotive relay, this information pertains to all relay controlled circuits. Mitsubishi Disclaimer. Here we're gonna' bypass the radiator fan switch with a jumper wire and see if the radiator fan motor comes on. Show 40 post(s) from this thread on one page. The cooling fans on Chrysler cars are not particularly well-made, but that doesn't mean you can assume that they are broken the second the cooling system stops working. Purchase a 4-post relay with a 30-amp rating. We use cookies to … Connect the other end of the jumper to the terminal labeled with the number 74 (see illustration 2 of 2). The radiator fan switch relay may not be supplying power to the fan. Your next step is to go to: TEST 6: Making Sure The Radiator Fan Assembly Is Getting Power From The Low Speed Relay. Save Share. CASE 2: The amperage draw is over 40 Amps. Isuzu  |   To be a bit more specific: We're gonna' jumper female terminals 77 and 79 of the high speed radiator fan relay socket in the Power Distribution Center. The cooling fan relay is normally located in either the underhood fuse and relay center or mounted to the electric fan assembly behind the radiator. This material may not be reproduced without the author's consent. This socket is on the Power Distribution Center (see image 3 of 3 above). Reply. The cooling fan relay is the relay that controls the engine’s cooling fans. Jeep  |   Honda  |   You can also refer to your owner's manual if the relay doesn't have any symbols.Resistance Test: 1. 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. Your next step is to go to: TEST 4: Bypassing The Low Speed Fan Motor Relay. Then test the fan clutch by giving it a good push. Disconnect the fan connector and make sure you have a good ground (the other connection goes to the relay). The next step is to make sure that both radiator fan motor relays are getting power. This last test is optional and shows you how to bench test the fan motor relay. Set th… 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. Diagnosing a 3.6L "Pentastar" Jeep JK Radiator Fan Issue (Code: … Hello, I'm posting here because it seems related to the problem I'm having. CASE 1: Both fan motors ran. Page 2 of 3 First 1 2 3 Last. Install a 10-gauge wire to the battery positive terminal with the use of a round electrical connector. After replacing the fuse check that terminal 71 has 10 to 12 Volts. 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