Engine Coolant Temperature Sensor Circuit Diagram
The engine coolant temperature sensor is temperature variable resistor which usually has a negative temperature coefficient. The engine cooling fan system is made up of the following parts.
As with the 4 cylinder engines this 4 pin sensor is also a combination sensor but the circuit is shared with the after run coolant fan control.
Engine coolant temperature sensor circuit diagram. A defective sensor can also produce black smoke from the exhaust pipe since more gas is being used than necessary. Engine coolant temperature sensor is usually located near the thermostat housing. Engine coolant temperature sensor circuit diagram.
One for the computer and a second one for the temperature gauge. The sensor for the computer will have at least two wires while the sensor for the gauge often has just one wire. When the engine is cold the sensor thermistor resistance is high therefore the ecm will see high signal voltage.
In many case you may find two sensors. It is a two wire thermistor immersed in coolant and measures its temperature. If your coolant temperature sensor isnt working efficiently your check engine light usually warns you of the hazardous heat thats affecting your vehicle.
Engine coolant temp sensor wires cut. The coolant temperature sensor can also fail in a manner that causes it to send a permanently hot signal. The ect is a thermistor device with a negative temperature coefficient.
The ect sensor is critical to many ecm functions such as fuel injection ignition timing variable valve timing fuel and emission controls function transmission shifting. On vr6 engines the coolant temperature gauge sensor terminals are 2 signal which is bluewhite and terminal 4 ground which is brown. The less common options were the 50 liter v8 74 liter v8 and some kind of a diesel engine.
The ect is connected to the thw terminal on the ecm. As the engine warms the sensor resistance becomes less and the voltage drops. At normal engine operating temperature 85 c to 95 c the voltage will measure about 15 to 20 volts at the ecm.
Another symptom of a problem with the coolant temperature sensor is an overheating engine. The following article discuss the 1996 peugeot 306 cooling fan circuit and wiring diagramherein you will find also detail explanation of peugeot 306 cooling fan basic principle. Perhaps somebody could post a schematic for a 1998 57 liter gm v8.
The ect usually located in a coolant passage just before the thermostat. Ops truck most likely has a 57 liter v8 or a 43 liter v6. The ect is one of the main inputs to the ecm.
This can cause the computer to incorrectly compensate for a lean signal which can result in overheating and even misfires or engine ping. 2 fan motors 3 relays control unit and the coolant temperature thermistor ntc. It operation has a huge effect on performance.
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