![]() ![]() And, is usually not a failure of the sensor itself. Keep in mind that many (ECT) sensor problems, are often, due to wiring faults and loose or corroded connectors. Engine Coolant Temperature (ECT) Sensor Testing Made Easy That’s why, its job is extremely important, in stopping engine overheating. Subsequently, using input from the (ECT) sensor. The (PCM) will cycle the cooling fan on and off, to control engine cooling. Operation of the electric cooling fan Dual Engine Cooling Fan The (PCM) may not lockup up the torque converter, until the engine has warmed up, to improve cold driveability. ![]() Transmission torque converter clutch lockup, during warm-up Consequently, to prevent stalling and improve idle quality. The (PCM) will usually, increase idle speed when a cold engine is first started. Finally, this condition, may also lead to spark plug fouling. Then, once the engine is warm, the fuel mixture will be, too rich causing, pollution and fuel waste. But, if the (PCM) fails to go into “closed loop”. And, keep the fuel mixture rich, to improve idle quality and cold driveability. While the engine is cold, the (PCM) will remain in “open loop”. The (PCM) may ignore the oxygen sensor (O2) rich/lean feedback signal, until the coolant reaches a certain temperature. Open/closed loop feedback control of the air/fuel mixture In addition, to prevent drivability problems. Evaporative emissions control canister purgeįuel vapors stored in the charcoal canister, are not purged until the engine is warm. An open thermostat or the wrong thermostat, may be stopping the coolant from reaching, its normal operating temperature. Then, it may cause a rough idle, stalling and/or hesitation. But, if the (EGR) is allowed, with a cold engine. The (PCM) will not allow the (EGR) valve to open, until the engine has warmed up, to improve driveability. Exhaust gas recirculation (EGR) valve, during warm-up Exhaust Gas Recirculation (EGR) Valve This also affects, engine performance and fuel economy. Spark advance, is often limited for emission purposes, until the engine reaches, normal operating temperature. Including, stalling, hesitation and rough idle. Also, a (ECT) sensor that always reads hot, may cause cold driveability problems. Consequently, polluting air and waste fuel. So, a faulty (ECT) sensor that always reads cold, may cause the fuel control system to run rich. Then, the (PCM) leans out the fuel mixture, to reduce emissions and fuel consumption. But, as the engine nears normal operating temperature. This improves idle quality and prevents hesitation, while the cold engine is warming up. Then, it increases injector pulse width (on time), to create a richer fuel mixture. If the (PCM) receives a cold signal from the (ECT) sensor. Input from the engine coolant temperature (ECT) sensor, may be used, by the (PCM) for any control functions: Start up fuel enrichment, on fuel injected engines P0119….Engine Coolant Temperature Circuit Intermittent.P0118….Engine Coolant Temperature Circuit High Input.P0117….Engine Coolant Temperature Circuit Low Input.P0116….Engine Coolant Temperature Circuit Range/Performance.P0115….Engine Coolant Temperature Circuit.Also, you may see one of the following, diagnostic trouble codes: The (OBD II) system, should catch the fault and turn on the, c heck engine light or (MIL) lamp. Usually is an engine control system that fails to go into closed loop, once the engine is warm. Engine Coolant Temperature (ECT) The most common symptom that indicates a bad (ECT) sensor. But, less fuel, when they are fully warmed up. Engines require, more fuel when they are cold. As a result, the (ECU) uses this data, to adjust, the fuel injection and ignition timing. Because, its readings, play a key role in calculations, which affect engine performance. The engine coolant temperature (ECT) sensor, is one of the most important, engine management sensors. The readings from the engine coolant temperature (ECT) sensor, are then sent back to the engine control unit (ECU). So, most engine coolant temperature (ECT) sensors operate, using electrical resistance to measure, the temperature of the coolant. The engine coolant temperature (ECT) sensors function, is to monitor the temperature, of the engine’s coolant. Engine Coolant Temperature (ECT) Sensor - Function - Failure and testing. ![]()
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