![]() The steps below demonstrate how to change a faulty coolant temperature sensor in your car. ![]() Replacing a coolant temperature sensor is a simple process for anyone who is familiar with the components of an engine, and can be done right on your drive. How to Replace a Coolant Temperature Sensor If in any doubt about which component is faulty beneath the bonnet, take your car to a professional mechanic for a complete diagnosis. Limited performance (caused by ECU miscalculating fuel rich mixture).Overheating engine (highlighted by dashboard gauge). ![]() Irregular reading of the dashboard gauge (should be 88-90☌ when the engine is warmed up).While a visual check can help to diagnose some faults, not all problems with a CTS show visible symptoms.īelow, we list the other signs and symptoms which could indicate a CTS issue: The CTS is usually found at the front of the car, near the thermostat housing, or on the radiator. Start by having a look at the unit itself to check its condition, as sensors/gaskets/connectors can develop cracks with extended use and continual temperature cycling. That’s why it’s important to know how to spot the signs of a faulty or failing temperature sensor, before it can cause further problems which could prove more expensive to fix. A faulty sensor can lead to a range of problems developing, including overheating and poor engine performance. Like any component under the bonnet, coolant temperature sensors can develop faults over time. How to Spot a Faulty Coolant Temperature Sensor This information is also used to send an accurate reading of the engine temperature to a gauge on the dashboard. The ECU uses this reading to calculate the coolant temperature, and from there adjusts the fuel injection, fuel mix, and ignition timing, and controls when the electric cooling fan is switched on and off. The resistance of the sensor varies with temperature, this is how the ECU can monitor temperature changes. To get an accurate reading of the current engine temperature, the ECU sends a regulated voltage to the CTS. The sensor works with the vehicle’s ECU, continually monitoring the coolant temperature to make sure the engine is running at the optimum temperature. ![]() I'm an electronics engineer and have many years of wiring and soldering experience, so am sure I could improvise a solution if the connector is corroded too.What is a Coolant Temperature Sensor and How Does It Work?Ī coolant temperature sensor (CTS) (also known as an ECT sensor or ECTS (engine coolant temperature sensor) is used to measure the temperature of the coolant/antifreeze mix in the cooling system, giving an indication of how much heat the engine is giving off. I am hoping that it's just the sensor that needs replacing and that the connector can just be cleaned up. I'd be grateful if someone could let me know the code for the radiator ECT sensor so I can get one in advance. The issue is that I'm having difficulty finding the correct Honda part code for this item and the many sensors listed on eBay and similar do not specify whether they're for ECT 1 or 2. I would like to order a new connector so that I can replace it at the same time as I service the car. I have read through the various posts on the forum about this fault and realise that the issue is most likely to be due to corrosion of the radiator sensor's pins, and possible also the connector. I have checked the coolant level and it's fine. Other than the fault warning, there are no other symptoms and the cooling fan is remaining off. I am assuming that this is the circuit's resistance rather than coolant temperature. I have read back the fault code via the OBD port and it's coming up as P2185 (ECT2 sensor circuit high). My wife's 2006 Civic 1.8ES, with 136k miles on the clock, has started throwing up engine occasional fault warnings. I'm new to this forum and have a question to ask about a part code.
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