![]() ![]() ![]() The computer mistakenly assumes the engine is cold, even when it is not. It is also common for a coolant temperature sensor to fail without warning and send permanently cold signals to the computer. And the response of the computer may unbalance the timing and fuel calculations. If the coolant temperature sensor malfunctions, it can transmit a false signal to the computer. Poor fuel economy is another symptom that indicates your coolant temperature sensor is malfunctioning. This causes the computer to erroneously counterbalance the signal, thereby causing the engine to misfire or overheat. At times, the coolant temperature switch may fail such that it starts transmitting hot signals permanently. If you notice that your engine overheats, the coolant temperature sensor could be the problem. Symptoms of a Bad Coolant Temperature Sensor Overheating Engine These symptoms should alert you of potential problems with your automobile and push you to have it checked out thoroughly. This post discusses some of the common symptoms of a bad coolant temperature sensor. And this implies that if the coolant temperature sensor malfunctions, it may translate very quickly to engine performance hiccups. This occurs to prevent overheating, which can damage the engine severely.Īs you can see, temperature plays such a crucial role in the performance calculations of your engine. If the computer detects that the engine’s temperature is too high, it will automatically scale back engine performance settings. Most automobile engines require more fuel when they are cold but require less when fully warmed up. This includes changing the engine’s timing as well as the fuel calculations for premium performance. The signal generated is automatically transmitted to the computer so that necessary changes can be made. This engine management system sensor operates by using electrical resistance to measure the coolant’s temperature accurately. The coolant temperature switch – otherwise known as the coolant temperature sensor – is primarily responsible for monitoring the engine coolant’s temperature. Retest system.A coolant temperature sensor remains one of the most vital engine management sensors. If resistance is greater than 5 ohms, repair open Red/White or Pink/Orange wire. If resistance is less than 5 ohms, repair/replace instrument cluster. Disconnect instrument cluster harness connector C237. ![]() Check Red/White Wire & Pink/Orange Wire For Open - Turn ignition off. ![]() If resistance is less than 10 k/ohms, repair short to ground in Red/White wire. If resistance is more than 10k/ohms, repair/replace instrument cluster. Measure resistance between instrument cluster harness connector C237 pin No. Check Red/White Wire For Short To Ground - Turn ignition off. If temperature gauge does not indicate hot, go to step 5). If temperature gauge indicates hot, replace coolant temperature sensor. By-Pass Temperature Sensor - Connect a jumper wire between the 2 pins of temperature sensor harness connector. If resistance is less than 10 k/ohms, repair Red/White wire. If resistance is more than 10 k/ohms, go to step 4). Measure resistance of Red/White wire between coolant temperature sender connector and ground. If temperature gauge indicates cold, go to step 3). If temperature gauge indicates does not indicate cold, go to next step. Disconnect Sensor - Ensure temperature sensor connector is in good condition. ![]()
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