radiator fan relay circuit

Shut the engine down and pull the CTS plug again. 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. Do not go any farther without consulting your service manual. Poor electrical connections in the cooling fan circuit 6. Anyone know where the relay for the cooling fan is? Faulty VSS (vehicle speed sensor) Most late model vehicles use an electric fan to pull air through the radiator. 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. The PCM (powertrain control module) senses the increase in engine temperature through the CTS (coolant temperature sensor) located near the thermostat. Most late model vehicles use an electric fan to pull air through the radiator. If necessary, a replacement relay costs around $20.There are three ways to check for a bad terminal. ground switched device using a simple spst relay. If not the harness between the fuse block and the fan is faulty. Open or shorted fan cooling fan harness 3. In most cases, their diagrams are right from the factory manuals. Use a test light to find the hot terminal. The opposite side goes to the fan. The reading will be about 2.5. - The A/C clutch requested. Related. Most modern vehicles use electric cooling fans to help pull air through the radiator so that it can keep the engine cool. The fan that is not in front of the air conditioning condenser is the main cooling fan and the one to concentrate on initially. 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. A/C refrigerant pressure sensor 10. The activated relay completes a circuit, allowing an electric current to flow through it and reach the cooling fans. When … If they prove to be good, check the CTS with an ohmmeter. Open or shorted fan control relay harness 4. Some Dodge vehicles have a solid state radiator fan controller that varies the fan speeds by pulsing the ground to the radiator fan motor. If you’re tracking down a wiring issue, Eautorepair.net is the better choice. However, Alldatadiy.com also includes disassembly instructions for interior trim panels and exterior items like headlights and tail lights. Video on how to diagnose dtc p1491, radiator fan control relay circuit malfunction on a 2003 jeep liberty sport. The schematic will help you also when checking the fan cooling circuit. 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. (Please call for fan shroud suggestions). That saves a lot of time because you don’t have to refer back to the component locator or circuit locations. 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. Use an ohmmeter to test that the constant battery terminal and the fan harness terminal have continuity meaning the circuit has closed. It does so by supplying the ground to the 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. Defective coolant temperature sensor 7. The bottom of the fuse block lid will usually indicate placement, but if not, look in the owner's manual. P1491 Radiator Fan Control Relay Circuit P1491 Radiator Fan Control Relay Circuit. The fan relays are nothing but a remote light switch. 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. Check it with the ohmmeter, there should be a big change in resistance, if not the sensor is bad. A code P1492 indicates a problem with the relay circuit. The radiator fan switch relay may not be supplying power to the fan. Some of the most common possible causes are: 1. However, specific troubleshooting steps will vary depending on the vehicle. A switched terminal will be hot only when the key is on. The negative terminal in this circuit is the one used when the PCM wishes to active the relay by grounding it. If the circuit has not closed or the relay has not clicked, the relay is bad. Accuracy isn't necessary since all sensors may be different. Most cooling fans use electric motors that have a moderate to high current draw, and as a result are commonly controlled using relays. How Dodge Radiator Fan Wiring Diagram is set up. Faulty cooling fan 1 3. The PCM controls the cooling fan by grounding the cooling fan control circuit which turns ON the cooling fan relay. First, note that the relay has four terminals: two control terminals and two power terminals. When the PCM attempts to activate the fan and senses the command and the result do not match, the code is set. 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. you take on any vehicle. 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. The cooling fan relay coil receives the Ignition Voltage directly. With this sort of an illustrative manual, you’ll have the ability to troubleshoot, avoid, and complete your assignments without difficulty. It is a generic code applying to all OBD II (on board diagnostics) vehicles. The vehicle computer monitors coolant temperature with a sensor located near the thermostat. It is not intended as repair advice and we are not responsible for any actions 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. 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. Check the electrical connection at the fan. Defective coolant temperature sensor 7. your question in our FREE car repair forums. 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. For precise readings consult a service manual. This is a generic powertrain diagnostic trouble code (DTC) applicable to most 1996-newer vehicles. The first part of the installation is to install the electric fan to your radiator, and remove the mechanical fan. What does that mean? But other Chrysler and Dodge vehicles use a more traditional radiator fan relay. Defective faulty fan control relay 1 2. Faulty cooling fan 3 5. Look at the circuit diagram displayed on the side of 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 … Multiple factors can lead to this error code, some of the most common possible causes are: 1. While you are driving, air in sufficient quantity is passing through the radiator effectively cooling the engine. This one turns on the fan when the circuit is closed. - The vehicle speed is less than 38 MPH. Look at the side of the relay for the switched power terminal or just turn the key on. If it will not spin the fan bearings are shot and the fan is bad. + + this will be your new ground switched output. Get the BEST auto repair information Alldatadiy.com and Eautorepair.net are professional-grade shop manuals—period. Eautorepair.net redraws factory wiring diagrams in color and includes the component, splice and ground locations right in their diagrams. ( make sure there is no obstruction in front of the wiring and system. Bent pins, look in the cooling fan by grounding the cooling fan relay diagram... Is not intended as repair advice and we are not responsible for any actions you take on vehicle... To find the hot terminal commonly controlled using relays on initially makes/models, 1996-newer 3. Result do not go any farther without consulting your service manual to be they. The 200,000 scale terminal will be your new ground switched output itself or consult the schematic printed the. Passing through the radiator fan relay this error code code P1492 indicates problem. 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