Repair if necessary and use dielectric grease on the terminals. All information on this site is copyright protected. Some Dodge vehicles have a solid state radiator fan controller that varies the fan speeds by pulsing the ground to the radiator fan motor. 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. It is not intended as repair advice and we are not responsible for any actions 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. Specific repair steps can vary from make/model. Electric fan is responsible for causing air movement around the engine coolant radiator. You just want to know if it's working. A constant power supply from the battery is present on a terminal in each of the relays. your question in our FREE car repair forums. P1491 Radiator Fan Control Relay Circuit P1491 Radiator Fan Control Relay Circuit. + + this will be your new ground switched output. 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. The cooling fan relay is the relay that controls the engine’s cooling fans. Set the … 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. For precise readings consult a service manual. 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. This is also a good idea before buying a vehicle. Most modern vehicles use electric cooling fans to help pull air through the radiator so that it can keep the engine cool. Related. Most late model vehicles use an electric fan to pull air through the radiator. 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. By using a lower voltage signal to control the relay, there is less stress on the rest of the wiring and charging system. Open or shorted fan cooling fan harness 5. Look at the circuit diagram displayed on the side of the relay. However, specific troubleshooting steps will vary depending on the vehicle. The fan that is not in front of the air conditioning condenser is the main cooling fan and the one to concentrate on initially. The negative terminal in this circuit is the one used when the PCM wishes to active the relay by grounding it. When … The fan as well as other apparatus draws too much amperage to be safe in the cockpit, so it's kept under the hood. A code P1492 indicates a problem with the relay circuit. Disconnecting the PCM could cause loss of programming and the vehicle may not start unless towed to the dealer for reprogramming. What does that mean? But other Chrysler and Dodge vehicles use a more traditional radiator fan relay. This is a generic powertrain diagnostic trouble code (DTC), which means it covers all makes/models, 1996-newer. When you bring the car to a stop no air is passing through the radiator and the engine begins to increase in temperature. Open the hood and do a visual inspection. The vehicle's PCM's function is to act as a ground to operate components, not to supply power. The schematic will help you also when checking the fan cooling circuit. This will allow mounting of the fan(s) without compromising the core of the radiator. Additionally, many vehicles have multi-speed fans requiring as many as three fan speed relays for low, medium and high. 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. If it will not spin the fan bearings are shot and the fan is bad. Dodge Radiator Fan Wiring Diagram. 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. Verify the battery positive terminal in the relay block with constant power. A/C refrigerant pressure sensor 10. Defective coolant temperature sensor 7. While you are driving, air in sufficient quantity is passing through the radiator effectively cooling the engine. Mount the fan as high up on the core as possible. Any one know where the thermostat or temp switch for the control circuit is? A/C selector switch 9. If you’re tracking down a wiring issue, Eautorepair.net is the better choice. The fans that are used to cool the engines radiator are run by electric motors. However, specific troubleshooting steps will vary depending on the vehicle. If swapping relays still doesn't operate your cooling fan, make sure the relay is receiving power from the computer. Eautorepair.net redraws factory wiring diagrams in color and includes the component, splice and ground locations right in their diagrams. This is a generic powertrain diagnostic trouble code (DTC) applicable to most 1996-newer vehicles. Check the electrical connection at the fan. Faulty VSS (vehicle speed sensor) IAT (intake air temperature) failure 8. Look at the side of the relay for the switched power terminal or just turn the key on. 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. The first part of the installation is to install the electric fan to your radiator, and remove the mechanical fan. ground switched device using a simple spst relay. The switch will click on. The activated relay completes a circuit, allowing an electric current to flow through it and reach the cooling fans. 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. Faulty VSS (vehicle speed sensor) The opposite side goes to the fan. Spin the fan with your finger (make sure the vehicle and key is off). DIAGNOSTIC TROUBLE CODE (DTC) - P0481 HIGH SPEED COOLING FAN RELAY CIRCUIT FAULT (WITHOUT A/C) Details of the Circuit. The vehicle computer monitors coolant temperature with a sensor located near the thermostat. 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 you still need help regarding the P0480 trouble code, please post It is a generic code applying to all OBD II (on board diagnostics) vehicles. A switched terminal will be hot only when the key is on. 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. However, Alldatadiy.com also includes disassembly instructions for interior trim panels and exterior items like headlights and tail lights. A/C refrigerant pressure sensor 10. In most cases, their diagrams are right from the factory manuals. 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. A duty cycle is determined based on these input parameters. Reconnect it and warm the engine. They include wiring diagrams and technical service bulletins. The cooling fan relay coil receives the Ignition Voltage directly. It does so by supplying the ground to the relay. The PCM (powertrain control module) senses the increase in engine temperature through the CTS (coolant temperature sensor) located near the thermostat. If they are good pull the cooling fan relays out. 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. Cooling Fan 3 Relay Control Circuit High. 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. This one turns on the fan when the circuit is closed. If the circuit has not closed or the relay has not clicked, the relay is bad. Some of the most common possible causes are: 1. Jump the battery terminal to the fan harness terminal and the fan will operate. Pull the connector off. Check the terminals for an additional power terminal and look where it would be on the relay. (adsbygoogle = window.adsbygoogle || []).push({}); While you are driving, air in sufficient quantity is passing through the radiator effectively cooling the engine. Faulty cooling fan 3 5. See the schematic printed on the relay itself or consult the schematic in your vehicle repair manual, if necessary. Faulty cooling fan 1 3. Pull the connector apart and look for corrosion or bent pins. If necessary, a replacement relay costs around $20.There are three ways to check for a bad terminal. 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. Shut the engine down and pull the CTS plug again. When the PCM attempts to activate the fan and senses the command and the result do not match, the code is set. 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 - The A/C clutch requested. Do not go any farther without consulting your service manual. The radiator fan switch relay may not be supplying power to the fan. Search using your favorite search engine "technical service bulletins for ....." Look up the code and the type of manufacturer recommended repair. Published by Saum Hadi. How Dodge Radiator Fan Wiring Diagram is set up. Look at the fan and make sure there is no obstruction in front of the radiator blocking airflow. NOTE: This information is presented for information purposes only. The PCM controls the cooling fan by grounding the cooling fan control circuit which turns ON the cooling fan relay. The cooling fan relay is an electromagnetic switch that controls the power supply to the engine’s cooling fans. The ground completes the circuit to the relay and switches power to the fan. If there was no switched power at the relay, the ignition switch is suspect. cooling fan relay wiring diagram – You will need a comprehensive, expert, and easy to understand Wiring Diagram. Look for the simple open and shut circuit. 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. IAT (intake air temperature) failure 8. 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. Multiple factors can lead to this error code, some of the most common possible causes are: 1. - The A/C clutch requested. 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. You can also refer to your owner's manual if the relay doesn't have any symbols.Resistance Test: 1. A malfunctioning cooling fan relay can … If the fan operated, check the relays. - The vehicle speed is less than 38 MPH. Get the BEST auto repair information Alldatadiy.com and Eautorepair.net are professional-grade shop manuals—period. Video on how to diagnose dtc p1491, radiator fan control relay circuit malfunction on a 2003 jeep liberty sport. Open or shorted fan control relay harness 4. - The vehicle speed is less than 38 MPH. This is a generic powertrain diagnostic trouble code (DTC), which means it covers all makes/models, 1996-newer. 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. Probe the sensor terminals. When coolant temperature rises above acceptable limits, the computer provides ground to the fan relay. There are multiple factors that can lead to this error code. The operating components in the cooling fan circuit include the cooling fan fuse, relay, coolant temperature sensor and the computer. Open the fuse block and inspect the cooling fan relay fuses. Accuracy isn't necessary since all sensors may be different. It is a generic code applying to all OBD II (on board diagnostics) vehicles. 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". Check all the relays in the same fashion to be sure they are all working. The fan relays are nothing but a remote light switch. 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. Most late model vehicles use an electric fan to pull air through the radiator. Check it with the ohmmeter, there should be a big change in resistance, if not the sensor is bad. Defective faulty fan control relay 1 2. A/C selector switch 9. Defective or faulty fan control relay 3 4. 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. 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? 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. Open or shorted fan control relay harness 2. The PCM controls the cooling fan by grounding the cooling fan control circuit which turns ON the cooling fan relay. The PCM controls the cooling fan by grounding the cooling fan control circuit which turns ON the cooling fan relay. Use a test light to find the hot terminal. Anyone know where the relay for the cooling fan is? Defective coolant temperature sensor 7. 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. Contact Us If not the harness between the fuse block and the fan is faulty. Poor electrical connections in the cooling fan circuit 6. 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. If they prove to be good, check the CTS with an ohmmeter. 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. 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. 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. 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. First, note that the relay has four terminals: two control terminals and two power terminals. Use an ohmmeter to test that the constant battery terminal and the fan harness terminal have continuity meaning the circuit has closed. 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 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. Let the engine cool and put the ohmmeter on the 200,000 scale. (Please call for fan shroud suggestions). Poor electrical connections in the cooling fan circuit 6. - The A/C clutch requested. 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. The reading will be about 2.5. 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. Alldatadiy.com, on the other hand, uses the factory diagrams. - The vehicle speed is less than 38 MPH. With this sort of an illustrative manual, you’ll have the ability to troubleshoot, avoid, and complete your assignments without difficulty. The bottom of the fuse block lid will usually indicate placement, but if not, look in the owner's manual. 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. Refer to the top or side of the relay to locate these terminals. Most cooling fans use electric motors that have a moderate to high current draw, and as a result are commonly controlled using relays. Open or shorted fan cooling fan harness 3. And key is off ) completes the circuit radiator fan relay circuit not closed or the itself... 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