As a result, causing the computer to incorrectly compensate for a lean signal. The coolant temperature sensor can also fail in a manner, that causes it to send a permanently hot signal. Engine OverheatingĪnother symptom of a problem with the coolant temperature sensor is, an overheating engine. As a result, it will burn up in the exhaust pipes and cause black smoke. If the fuel mixture becomes excessively rich, the fuel cannot be adequately burned. Black Tailpipe SmokeĬonsequently, confusing the computer and causing it to, unnecessarily enrich the fuel mixture. A failed sensor can also send, a cold signal to the computer. Black Smoke From ExhaustĪnother symptom of a possible problem with the (ECT) sensor is, black smoke from the vehicle’s exhaust. A failed (ECT) sensor can prevent this change from happening, resulting in a rich-running engine and poor fuel economy. Once the engine is warm, it switches to relying on the oxygen (O2) sensors for a more precise reading. This will cause the computer to think the engine is cold, even when it is not. It is not uncommon for the coolant temperature sensor to fail and send a permanently cold signal to the computer. A failed (ECT) sensor can send a false signal to the computer and throw off the fuel and timing calculations. One of the first symptoms, associated with a problem with the (ECT) sensor is poor fuel economy. Common Failure Symptoms Usually a problem with the (ECT) sensor will show a few failure symptoms: But, a faulty engine coolant temperature (ECT) sensor can, cause havoc on an engine or its related systems. Ideally, the engine will run as hot as possible, without boiling its coolant or damaging its components. Testing Coolant Temperature Sensor (ECT)Įngine efficiency, power and fuel economy all improve, as the engine temperature rises. There are several ways to test the (ECT) sensor, you can find the correct way in the service manual. Next, the (ECT) sensor connector, must be checked for damaged pins or corrosion.
Consequently, a low coolant level inside the cooling system, can cause the signal from the sensor to be incorrect.Īlways check the coolant level first. So, the tip of the sensor, has to be immersed in coolant. Therefore, the problem must be properly diagnosed. Such as a bad thermostat or issues with the cooling system, including even a leaking head gasket. The engine may run in fail-safe mode:Ĭonsequently, many check engine light codes, referring to the (ECT) sensor, could also be caused by other reasons. In some vehicles, symptoms of this problem show up as, erratic readings of the temperature gauge. This causes interruptions in the signal to the (PCM) and the (PCM) sets the fault. One of the common problems is, when the sensor has a, poor connection inside or in the connector.
Chevy coolant temperature sensor symptoms code#
If the signal from the sensor is missing, or it is outside of the expected range, the (PCM) turns on the Check Engine light and, stores the related trouble code in its memory. (ECT) Sensor With O-Ring Type Of Mounting It also operates the electric radiator fans, when the temperature reaches, a predetermined level. Based on this signal, the (PCM) adjusts the engines performance. The (PCM) supplies a reference voltage (typically 5 Volt) and constantly monitors the (ECT) sensor signal. How Does It WorkĪn (ECT) sensor is connected to, the main computer (powertrain control module or (PCM). Therefore, any problem with the coolant temperature sensor, can quickly translate into an engine performance issues. Engine temperature plays, such a vital role in engine performance calculations.
So, it can protect the engine from possible damage, due to overheating. The computer will also scale back engine performance settings, if it detects that the engine temperature is too high. Consequently, engines need more fuel, when they are cold and less fuel, when they are warmed up. So, changes can be made to the engine’s timing and fuel calculations, for optimal performance. The engines computer receives this signal.
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