Search using your favorite search engine "technical service bulletins for ....." Look up the code and the type of manufacturer recommended repair. The fan that is not in front of the air conditioning condenser is the main cooling fan and the one to concentrate on initially. Eautorepair.net redraws factory wiring diagrams in color and includes the component, splice and ground locations right in their diagrams. Spin the fan with your finger (make sure the vehicle and key is off). 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. Video on how to diagnose dtc p1491, radiator fan control relay circuit malfunction on a 2003 jeep liberty sport. It is a generic code applying to all OBD II (on board diagnostics) vehicles. 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. The fan as well as other apparatus draws too much amperage to be safe in the cockpit, so it's kept under the hood. DIAGNOSTIC TROUBLE CODE (DTC) - P0481 HIGH SPEED COOLING FAN RELAY CIRCUIT FAULT (WITHOUT A/C) Details of the Circuit. Let the engine cool and put the ohmmeter on the 200,000 scale. Poor electrical connections in the cooling fan circuit 6. Open the fuse block and inspect the cooling fan relay fuses. Reconnect it and warm the engine. However, specific troubleshooting steps will vary depending on the vehicle. 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. Faulty VSS (vehicle speed sensor) 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. Most modern vehicles use electric cooling fans to help pull air through the radiator so that it can keep the engine cool. The operating components in the cooling fan circuit include the cooling fan fuse, relay, coolant temperature sensor and the computer. You just want to know if it's working. All information on this site is copyright protected. Set the … 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. The ground completes the circuit to the relay and switches power to the fan. Do not go any farther without consulting your service manual. Alldatadiy.com, on the other hand, uses the factory diagrams. 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. That saves a lot of time because you don’t have to refer back to the component locator or circuit locations. Anyone know where the relay for the cooling fan is? For precise readings consult a service manual. The vehicle's PCM's function is to act as a ground to operate components, not to supply power. Most late model vehicles use an electric fan to pull air through the radiator. But other Chrysler and Dodge vehicles use a more traditional radiator fan relay. By using a lower voltage signal to control the relay, there is less stress on the rest of the wiring and charging system. Repair if necessary and use dielectric grease on the terminals. This is a generic powertrain diagnostic trouble code (DTC) applicable to most 1996-newer vehicles. - The A/C clutch requested. Pull the connector apart and look for corrosion or bent pins. Some of the most common possible causes are: 1. Dodge Radiator Fan Wiring Diagram. This one turns on the fan when the circuit is closed. This will allow mounting of the fan(s) without compromising the core of the radiator. Contact Us The fan relays are nothing but a remote light switch. Open or shorted fan cooling fan harness 3. This is a generic powertrain diagnostic trouble code (DTC), which means it covers all makes/models, 1996-newer. Open or shorted fan control relay harness 4. If necessary, a replacement relay costs around $20.There are three ways to check for a bad terminal. cooling fan relay wiring diagram – You will need a comprehensive, expert, and easy to understand Wiring Diagram. 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. If it will not spin the fan bearings are shot and the fan is bad. However, Alldatadiy.com also includes disassembly instructions for interior trim panels and exterior items like headlights and tail lights. If the circuit has not closed or the relay has not clicked, the relay is bad. A switched terminal will be hot only when the key is on. Look at the side of the relay for the switched power terminal or just turn the key on. If they are good pull the cooling fan relays out. IAT (intake air temperature) failure 8. It does so by supplying the ground to the relay. 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 … If there was no switched power at the relay, the ignition switch is suspect. Open or shorted fan cooling fan harness 5. Published by Saum Hadi. The PCM controls the cooling fan by grounding the cooling fan control circuit which turns ON the cooling fan relay. Additionally, many vehicles have multi-speed fans requiring as many as three fan speed relays for low, medium and high. 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. When coolant temperature rises above acceptable limits, the computer provides ground to the fan relay. When you bring the car to a stop no air is passing through the radiator and the engine begins to increase in temperature. 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. NOTE: This information is presented for information purposes only. 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? When … Some Dodge vehicles have a solid state radiator fan controller that varies the fan speeds by pulsing the ground to the radiator fan motor. Use an ohmmeter to test that the constant battery terminal and the fan harness terminal have continuity meaning the circuit has closed. 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 (powertrain control module) senses the increase in engine temperature through the CTS (coolant temperature sensor) located near the thermostat. The cooling fan relay is the relay that controls the engine’s cooling fans. Cooling Fan 3 Relay Control Circuit High. If you’re tracking down a wiring issue, Eautorepair.net is the better choice. (Please call for fan shroud suggestions). A malfunctioning cooling fan relay can … 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. 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. 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. 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. A/C selector switch 9. With this sort of an illustrative manual, you’ll have the ability to troubleshoot, avoid, and complete your assignments without difficulty. 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. They include wiring diagrams and technical service bulletins. 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. 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. If you need to dig into your doors, dash or console, Alldatadiy.com is the better choice because Eautorepair.net doesn’t any interior or exterior trim or body part removal. Specific repair steps can vary from make/model. - 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. (adsbygoogle = window.adsbygoogle || []).push({}); While you are driving, air in sufficient quantity is passing through the radiator effectively cooling the engine. your question in our FREE car repair forums. If they prove to be good, check the CTS with an ohmmeter. 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. Use a test light to find the hot terminal. A/C refrigerant pressure sensor 10. Multiple factors can lead to this error code, some of the most common possible causes are: 1. The opposite side goes to the fan. Mount the fan as high up on the core as possible. The vehicle computer monitors coolant temperature with a sensor located near the thermostat. Disconnecting the PCM could cause loss of programming and the vehicle may not start unless towed to the dealer for reprogramming. The bottom of the fuse block lid will usually indicate placement, but if not, look in the owner's manual. A duty cycle is determined based on these input parameters. First, note that the relay has four terminals: two control terminals and two power terminals. Accuracy isn't necessary since all sensors may be different. What does that mean? A code P1492 indicates a problem with the relay circuit. P1491 Radiator Fan Control Relay Circuit P1491 Radiator Fan Control Relay Circuit. Any one know where the thermostat or temp switch for the control circuit is? 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. Open or shorted fan control relay harness 2. The negative terminal in this circuit is the one used when the PCM wishes to active the relay by grounding it. 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 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. Look at the fan and make sure there is no obstruction in front of the radiator blocking airflow. 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". IAT (intake air temperature) failure 8. Poor electrical connections in the cooling fan circuit 6. Refer to the top or side of the relay to locate these terminals. The switch will click on. It is a generic code applying to all OBD II (on board diagnostics) vehicles. The cooling fan relay coil receives the Ignition Voltage directly. This is also a good idea before buying a vehicle. Shut the engine down and pull the CTS plug again. It is not intended as repair advice and we are not responsible for any actions 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 cooling fan relay is an electromagnetic switch that controls the power supply to the engine’s cooling fans. A/C selector switch 9. The radiator fan switch relay may not be supplying power to the fan. Check the terminals for an additional power terminal and look where it would be on the relay. + + this will be your new ground switched output. This is a generic powertrain diagnostic trouble code (DTC), which means it covers all makes/models, 1996-newer. In most cases, their diagrams are right from the factory manuals. Jump the battery terminal to the fan harness terminal and the fan will operate. If not the harness between the fuse block and the fan is faulty. 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. Look for the simple open and shut circuit. - The vehicle speed is less than 38 MPH. While you are driving, air in sufficient quantity is passing through the radiator effectively cooling the engine. The schematic will help you also when checking the fan cooling circuit. 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. Electric fan is responsible for causing air movement around the engine coolant 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. A constant power supply from the battery is present on a terminal in each of the relays. Look at the circuit diagram displayed on the side of the relay. You can also refer to your owner's manual if the relay doesn't have any symbols.Resistance Test: 1. The fans that are used to cool the engines radiator are run by electric motors. 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. Check all the relays in the same fashion to be sure they are all working. Defective or faulty fan control relay 3 4. There are multiple factors that can lead to this error code. The reading will be about 2.5. If you still need help regarding the P0480 trouble code, please post Open the hood and do a visual inspection. The first part of the installation is to install the electric fan to your radiator, and remove the mechanical fan. Verify the battery positive terminal in the relay block with constant power. However, specific troubleshooting steps will vary depending on the vehicle. Check it with the ohmmeter, there should be a big change in resistance, if not the sensor is bad. Probe the sensor terminals. The activated relay completes a circuit, allowing an electric current to flow through it and reach the cooling fans. 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. A/C refrigerant pressure sensor 10. 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 Defective faulty fan control relay 1 2. - The A/C clutch requested. Most cooling fans use electric motors that have a moderate to high current draw, and as a result are commonly controlled using relays. Most late model vehicles use an electric fan to pull air through the radiator. you take on any vehicle. Faulty cooling fan 3 5. 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. If the fan operated, check the relays. The PCM controls the cooling fan by grounding the cooling fan control circuit which turns ON the cooling fan relay. When the PCM attempts to activate the fan and senses the command and the result do not match, the code is set. Faulty cooling fan 1 3. 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. How Dodge Radiator Fan Wiring Diagram is set up. Faulty VSS (vehicle speed sensor) Related. - The vehicle speed is less than 38 MPH. ground switched device using a simple spst relay. 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. 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