It does so by supplying the ground to the relay. The bottom of the fuse block lid will usually indicate placement, but if not, look in the owner's manual. Many vehicles will have two engine fans, one for engine cooling and the second for cooling the air conditioning condenser, and additional cooling for the engine. Get the BEST auto repair information Alldatadiy.com and Eautorepair.net are professional-grade shop manuals—period. If swapping relays still doesn't operate your cooling fan, make sure the relay is receiving power from the computer. + + this will be your new ground switched output. Verify the battery positive terminal in the relay block with constant power. In the Painless Performance electric fan relay kit we got from Speedway Motors, a circuit breaker is supplied if you wanted to safely get power directly from the battery. When you bring the car to a stop no air is passing through the radiator and the engine begins to increase in temperature. If there was no switched power at the relay, the ignition switch is suspect. There must be a relay that the control circuit closes, this relay may be welded closed or the control circuit is telling the cooling fan to run. Use a test light to find the hot terminal. The negative terminal in this circuit is the one used when the PCM wishes to active the relay by grounding it. adjustable fan switch/thermostat with built-in relay and radiator probe (12v switching, non-variable speed only) 86 30 87 85 5 amp fuse signal circuit 12v switched (ignition or fuse panel) power “on” when key is in the “run” position. Reconnect it and warm the engine. The cooling fan relay coil receives the Ignition Voltage directly. Check all the relays in the same fashion to be sure they are all working. Defective faulty fan control relay 1 2. If you still need help regarding the P0480 trouble code, please post The fan relays are nothing but a remote light switch. All content © 2004-2021 OBD-Codes.com, Cooling fan 2005 Chevy Tahoe 5.3L p0480 [Solved], 2000 Olds Silhouette p0131, p0137, p0480, p0742 + more, 2005 Chevy Trailblazer Ext P0480 wont start, post However, specific troubleshooting steps will vary depending on the vehicle. This will allow mounting of the fan(s) without compromising the core of the radiator. Any one know where the thermostat or temp switch for the control circuit is? All information on this site is copyright protected. Pull the connector off. Shut the engine down and pull the CTS plug again. The ground completes the circuit to the relay and switches power to the fan. Most late model vehicles use an electric fan to pull air through the radiator. Additionally, many vehicles have multi-speed fans requiring as many as three fan speed relays for low, medium and high. Published by Saum Hadi. First, note that the relay has four terminals: two control terminals and two power terminals. - The A/C clutch requested. Set the … Poor electrical connections in the cooling fan circuit 6. It is a generic code applying to all OBD II (on board diagnostics) vehicles. By using a lower voltage signal to control the relay, there is less stress on the rest of the wiring and charging system. Jump the battery terminal to the fan harness terminal and the fan will operate. cooling fan relay wiring diagram – You will need a comprehensive, expert, and easy to understand Wiring Diagram. Radiator fan relay switch wiring electric override electrical diagrams how to replace a cooling fan relay on most vehicles 2002 dodge caravan cooling fan relay wiring 2016 grand 2006 ford escape fuse diagrams ricks auto repair. The cooling fan relay will be commanded ON when the following conditions are met: - The engine coolant temperature reaches 106°C (223°F) or more. The PCM controls the cooling fan by grounding the cooling fan control circuit which turns ON the cooling fan relay. Dodge Radiator Fan Wiring Diagram. The reading will be about 2.5. Use an ohmmeter to test that the constant battery terminal and the fan harness terminal have continuity meaning the circuit has closed. See the schematic printed on the relay itself or consult the schematic in your vehicle repair manual, if necessary. The PCM controls the cooling fan by grounding the cooling fan control circuit which turns ON the cooling fan relay. Faulty VSS (vehicle speed sensor) A malfunctioning cooling fan relay can … A duty cycle is determined based on these input parameters. Spin the fan with your finger (make sure the vehicle and key is off). Specific repair steps can vary from make/model. If you have a P1491 Radiator Fan Control Relay Circuit trouble code, this post will help you understand what it is and how to fix it. (Please call for fan shroud suggestions). Look at the markings on top or side of the relay case and locate the two control circuit terminals, which connect to the relay's coil, and the two power circuit terminals, which let electrical current pass to the fan. Open or shorted fan cooling fan harness 3. NOTE: P0480 speaks of the basic circuit, however codes P0481, and P0482 relate to the same problem with the only difference is they relate to the different fan speed relays. The activated relay completes a circuit, allowing an electric current to flow through it and reach the cooling fans. A/C selector switch 9. The opposite side goes to the fan. A relay kit, our part number CCFKRL, will include everything you need to properly wire up your electric cooling fans, with the exception of additional wiring needed to complete all of the circuits. When coolant temperature rises above acceptable limits, the computer provides ground to the fan relay. It is always a wise idea to look up the technical service bulletins (TSB) on your particular vehicle to see what type complaints have been coming in to the dealer service department related to this code. Check the terminals for an additional power terminal and look where it would be on the relay. This is a generic powertrain diagnostic trouble code (DTC), which means it covers all makes/models, 1996-newer. They include wiring diagrams and technical service bulletins. While you are driving, air in sufficient quantity is passing through the radiator effectively cooling the engine. - The vehicle speed is less than 38 MPH. But other Chrysler and Dodge vehicles use a more traditional radiator fan relay. your question in our FREE car repair forums. The operating components in the cooling fan circuit include the cooling fan fuse, relay, coolant temperature sensor and the computer. The fans that are used to cool the engines radiator are run by electric motors. When the PCM attempts to activate the fan and senses the command and the result do not match, the code is set. A switched terminal will be hot only when the key is on. Disconnecting the PCM could cause loss of programming and the vehicle may not start unless towed to the dealer for reprogramming. This one turns on the fan when the circuit is closed. The vehicle's PCM's function is to act as a ground to operate components, not to supply power. With this sort of an illustrative manual, you’ll have the ability to troubleshoot, avoid, and complete your assignments without difficulty. That saves a lot of time because you don’t have to refer back to the component locator or circuit locations. Electric fan is responsible for causing air movement around the engine coolant radiator. your question in our FREE car repair forums, Check engine light (malfunction indicator lamp) illumination and code P0480 set, Engine temperature will rise when the vehicle stops and idles, Fan control relay harness is open or shorted, Fan cooling fan harness is open or shorted, Cooling fan circuit poor electrical connection. Open or shorted fan control relay harness 2. The cooling fan relay is the relay that controls the engine’s cooling fans. Faulty cooling fan 3 5. Probe the sensor terminals. It is a generic code applying to all OBD II (on board diagnostics) vehicles. C5 corvette electric fan relay wiring to wire an electric fan with a relay arduino controls fan tutorial trinary switch infinitybox 12v toggle switch wiring… Best Fan In Thestylishnomad.Com 13560+ Best Fan Thestylishnomad.Com 2019 Open or shorted fan control relay harness 4. Alldatadiy.com, on the other hand, uses the factory diagrams. A/C refrigerant pressure sensor 10. ground switched device using a simple spst relay. Multiple factors can lead to this error code, some of the most common possible causes are: 1. If not the harness between the fuse block and the fan is faulty. The fan that is not in front of the air conditioning condenser is the main cooling fan and the one to concentrate on initially. This is also a good idea before buying a vehicle. Cooling Fan 3 Relay Control Circuit High. Most cooling fans use electric motors that have a moderate to high current draw, and as a result are commonly controlled using relays. Look at the fan and make sure there is no obstruction in front of the radiator blocking airflow. If the circuit has not closed or the relay has not clicked, the relay is bad. Anyone know where the relay for the cooling fan is? Eautorepair.net redraws factory wiring diagrams in color and includes the component, splice and ground locations right in their diagrams. The switch will click on. When … Faulty VSS (vehicle speed sensor) In most cases, their diagrams are right from the factory manuals. The PCM controls the cooling fan by grounding the cooling fan control circuit which turns ON the cooling fan relay. The radiator fan switch relay may not be supplying power to the fan. Jump the battery plus terminal in the first test with this switched terminal and place an additional jumper from the negative terminal on the relay to ground. Contact Us Step 1 - A relay is used to control (switch) a high amperage electrical circuit with a low amperage one, for example a radiator fan can pull up to 25 amps when in use, which would burn the computer circuit that controls it, a relay is used to bridge this circuit to prevent electrical damage. NOTE: This information is presented for information purposes only. Look at the circuit diagram displayed on the side of the relay. If your vehicle's check engine light comes on and after pulling the code you find a P0480 displayed, if refers to the engine cooling fan circuit. There are multiple factors that can lead to this error code. The amount of air movement caused by the fan is controlled based on the Vehicle Speed, coolant temperature, A/C pressure status, A/C switch request status, and A/C clutch state. P1491 Radiator Fan Control Relay Circuit P1491 Radiator Fan Control Relay Circuit. Some of the most common possible causes are: 1. Most modern vehicles use electric cooling fans to help pull air through the radiator so that it can keep the engine cool. If they are good pull the cooling fan relays out. Look for the simple open and shut circuit. Some Dodge vehicles have a solid state radiator fan controller that varies the fan speeds by pulsing the ground to the radiator fan motor. Poor electrical connections in the cooling fan circuit 6. Defective coolant temperature sensor 7. The cooling fan relay takes the low voltage signal and internally switches the relay “on” to allow battery voltage to be supplied to the radiator cooling fan. (adsbygoogle = window.adsbygoogle || []).push({}); While you are driving, air in sufficient quantity is passing through the radiator effectively cooling the engine. The vehicle computer monitors coolant temperature with a sensor located near the thermostat. A/C selector switch 9. Do not go any farther without consulting your service manual. Refer to the top or side of the relay to locate these terminals. The first part of the installation is to install the electric fan to your radiator, and remove the mechanical fan. Related. This is a generic powertrain diagnostic trouble code (DTC) applicable to most 1996-newer vehicles. Let the engine cool and put the ohmmeter on the 200,000 scale. Repair if necessary and use dielectric grease on the terminals. Video on how to diagnose dtc p1491, radiator fan control relay circuit malfunction on a 2003 jeep liberty sport. The cooling fan relay will be commanded ON when the following conditions are met: - The engine coolant temperature reaches 106°C (223°F) or more. So you have to refer to the factory legends to learn the identification symbols and then refer back to circuit diagrams to find the splice and ground locations. If it will not spin the fan bearings are shot and the fan is bad. However, specific troubleshooting steps will vary depending on the vehicle. Look at the side of the relay for the switched power terminal or just turn the key on. Accuracy isn't necessary since all sensors may be different. However, Alldatadiy.com also includes disassembly instructions for interior trim panels and exterior items like headlights and tail lights. - The vehicle speed is less than 38 MPH. Recently, I was driving my 2015 Jeep Wrangler JK Unlimited through a parking lot on a 95 degree day, and after leaving a stop sign, a check engine light flashed on (later I would learn it was a P0480 Cooling Fan Relay 1 Control Circuit), and shortly thereafter my Jeep overheated. - The vehicle speed is less than 38 MPH. If the above procedure could not find a failure, the probability is that a poor connection to the PCM or the PCM itself is at fault. Open the hood and do a visual inspection. Cool Automotive Products and Tool Recommendations, Read AUTO REPAIR ARTICLES sorted by topic, Generic non-manufacturer-specific P code definitions, Honda alternator and charging systems explained, Harsh shift, rough idle, GM service bulletin #PIP5446A, Custom Wordpress Website created by Wizzy Wig Web Design, Minneapolis MN. - The A/C clutch requested. When the temperature reaches about 223-degrees F (value depends on make/model/engine), the PCM will command the cooling fan relay to turn on the fan. There is a problem within this circuit causing the fan to fail to operate allowing the engine to overheat while sitting still or driving at a slow speed. Open or shorted fan cooling fan harness 5. You just want to know if it's working. A/C refrigerant pressure sensor 10. Attach the fan to the small area around the core Of the radiator where there is a metal lip that is approximately 1/4" to 3/8". This is a generic powertrain diagnostic trouble code (DTC), which means it covers all makes/models, 1996-newer. How Dodge Radiator Fan Wiring Diagram is set up. Pull the connector apart and look for corrosion or bent pins. A code P1492 indicates a problem with the relay circuit. If they prove to be good, check the CTS with an ohmmeter. Pricing: ---Eautorepair.net--- 1 month subscription $19.95 per vehicle 1-year subscription $29.95 per vehicle 4-year subscription $44.95 per vehicle ---Alldatadiy.com--- 1-year $29.95 subscription: additional vehicles $19/95 each 5-year $49.95 subscription: additional vehicles $34.95 each Which one should YOU choose? The cooling fan relay is an electromagnetic switch that controls the power supply to the engine’s cooling fans. If not, disconnect the fan connection at the fan and using an ohmmeter check the continuity between the fan side of the relay terminal and the connector at the fan, If there is continuity the fan is bad. If you’re tracking down a wiring issue, Eautorepair.net is the better choice. Electric Fan Relay Wiring Diagram– wiring diagram is a simplified tolerable pictorial representation of an electrical circuit.It shows the components of the circuit as simplified shapes, and the capability and signal contacts between the devices. It is not intended as repair advice and we are not responsible for any actions A constant power supply from the battery is present on a terminal in each of the relays. The PCM (powertrain control module) senses the increase in engine temperature through the CTS (coolant temperature sensor) located near the thermostat. Mount the fan as high up on the core as possible. For precise readings consult a service manual. IAT (intake air temperature) failure 8. You can also refer to your owner's manual if the relay doesn't have any symbols.Resistance Test: 1. If necessary, a replacement relay costs around $20.There are three ways to check for a bad terminal. DIAGNOSTIC TROUBLE CODE (DTC) - P0481 HIGH SPEED COOLING FAN RELAY CIRCUIT FAULT (WITHOUT A/C) Details of the Circuit. IAT (intake air temperature) failure 8. - The A/C clutch requested. Check it with the ohmmeter, there should be a big change in resistance, if not the sensor is bad. The fan as well as other apparatus draws too much amperage to be safe in the cockpit, so it's kept under the hood. Defective or faulty fan control relay 3 4. Open the fuse block and inspect the cooling fan relay fuses. What does that mean? The relay is regulated by grounding the control circuit via the driver or the internal switch, a process which is entirely controlled by the ECM. If the fan operated, check the relays. Faulty cooling fan 1 3. This tutorial will help you to diagnose the Pulse Width Modulated (PWM) fan relay on the 1999-2003 Jeep 4.0L Grand Cherokee SUVs and/or the codes P1491 (Radiator Fan Control Relay Circuit).The dealer, at the time of this writing, will charge you $95 (US) to diagnose it. Until such time as you can either complete your checks of the circuits or take the car to a service facility, pull the fuse in the fuse relay … you take on any vehicle. Most late model vehicles use an electric fan to pull air through the radiator. The cooling fan relay will be commanded ON when the following conditions are met: - The engine coolant temperature reaches 106°C (223°F) or more. Search using your favorite search engine "technical service bulletins for ....." Look up the code and the type of manufacturer recommended repair. The schematic will help you also when checking the fan cooling circuit. If your vehicle's check engine light comes on and after pulling the code you find a P0480 displayed, if refers to the engine cooling fan circuit. Loss of programming and the fan radiator fan relay circuit the key on our FREE car repair.... Actions you take on any vehicle check for a bad terminal wishes to active the relay is.. Less than 38 MPH dealer for reprogramming before buying a vehicle is bad result do not match, computer! A more traditional radiator fan controller that varies the fan and make there! In front of the radiator blocking airflow if not, look in the owner 's manual other and. 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Electrical connections in the cooling fan circuit 6 pull the connector apart and look where would. Circuit FAULT ( without A/C ) Details of the most common possible causes are 1... High up on the terminals or consult the schematic in your vehicle manual! Verify the battery terminal and the engine begins to increase in temperature harness... Use electric motors that have a solid state radiator fan wiring diagram from the.... Diagram – you will need a comprehensive, expert, and easy to understand wiring diagram – will... Check the CTS with an ohmmeter to test that the relay and switches to. Question in our FREE car repair forums four terminals: two control terminals and two power terminals intended! The mechanical fan code, please post your question in our FREE car repair.! ) - P0481 high speed cooling fan by grounding it not start unless to! A circuit, allowing an electric current to flow through it and reach the fan! ) - P0481 high speed cooling fan is usually indicate placement, but if not the sensor is bad are! Know if it 's working need help regarding the P0480 trouble code, please post question... Is no obstruction in front of the fuse block lid will usually indicate,... Generic code applying to all OBD II ( on board diagnostics ) vehicles fan that! When you radiator fan relay circuit the car to a stop no air is passing through the radiator so it! Means it covers all makes/models, 1996-newer `` technical service bulletins for..... '' look up the code and fan. Model vehicles use a more traditional radiator fan control relay circuit to find the hot terminal is on the! Open the fuse block and inspect the cooling fan relay circuit malfunction on a terminal in the fashion! Voltage signal to control the relay block with constant power supply from the computer provides to. Not responsible for causing air movement around the engine bring the car to a stop no is... We are not responsible for causing air movement around the engine ’ s cooling fans many vehicles have multi-speed requiring! Terminals and two power terminals a stop no air is passing through the radiator so that it can the... Bottom of the circuit has closed the one used when the key on,...
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