![]() The engine is getting poor fuel economy: when the coolant temperature sensor is not functioning correctly, it tends to relay false information to the engine control module. Noted below are a few of the warning signs that will alert you that the coolant temperature sensor is damaged and needs to be replaced. Before you make the decision to replace the coolant temperature sensor, make sure diagnose some of the warning signs of a faulty coolant temperature sensor. Taking time to properly diagnose the precise cause of the overheating situation is very important to providing a solution and actually fixing what is broken. When a problem occurs with engine heating or overheating, it may be due to one or multiple broken parts. The coolant system on today's cars, trucks, and SUV's is comprised of multiple components that work together to keep your engine running well. Part 1 of 3: Diagnosing a problem with the coolant temperature sensor If you discover that the sensor is failing, you'll have to replace this device by following the step-by-step instructions noted below. When the signal is sent to the ECM, the computer adjusts the vehicles ignition timing, fuel flow, and other factors that trim or enhance performance based on the coolant temperature.ĭue to the fact that engine temperature plays a vital role in the overall performance of any vehicle, having a properly functioning coolant temperature sensor is essential. The coolant temperature sensor (switch) utilizes electrical resistance to measure the coolant's temperature. ![]() When the sensor is functioning properly, it will tell your on board computer if the temperature is too high, alerting the driver that a problem exists by illuminating a warning light on the dashboard. The coolant temperature sensor, also known as the coolant temperature switch, is the engine management system that monitors the temperature of the coolant and relays this information to the ECM. One of the most important systems to monitor is the cooling system, which includes the radiator, water pump, radiator fan, coolant lines, and overflow tank. It may work for other fuel injected Jeeps as well.Today's engines monitor virtually every function to ensure your vehicle runs strongly and efficiently every day. See YouTube video at the bottom of the page.īelow is the Temp to resistance chart for the Jeep YJ & XJ. Not the water temp as you measure the resistance and compare it to the chart below. Use a thermometer to measure the water temp as it climbs. Something like a pan of water on the stove top over low heat. Also a way to vary the temperature of the sensor. But test that rascal anyway!Īll you need is a multimeter to measure resistance of the contacts at different temperature levels. ![]() More cases than not you may find it being a wiring issue than the sensor its self. It's really not a sensor that fails often. Cracks in the plastic where the harness connects on to it. Leaking around where it screws in or where the electrical connections. Click here to see how to get the DTC code from the Jeeps computer. If there is a code it will be code 22 per the light flashes. If its just reading out of range it may not turn on the check engine light, but the PCM could actually be storing the code. Especially if the sensor is under a direct short or completely open circuit condition. Will it trigger the check engine light if the sensor is faulty? For poor performance issues and testing we are going to look at the two wire up front. The two wire sensor located in the thermostat housing sends its signal to the PCM. If you temp gauge isn't acting right, replace the one wire. The one wire sensor in the back sends temp readings to the gauge in the Jeeps dash. Then there is another at the back drivers topside of the engine cylinder head just to the right of the valve cover, this one has one wire. There is one at the front of the engine in the thermostat housing, this one has two wires. Coolant Temperature Sensor test for the Jeep Wrangler YJ
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