Oldsmobile 15326386 Sensor,Engine Coolant Temperature

You can find the ECT sensor behind the engine, the edge facing the firewall and below the EGR valve. The first step of removing the ECT sensor is unplugging its cable from the negative battery cable. It is important to empty part of engine coolant before taking out ECT sensor from the vehicle, as it helps in reducing cooling loss. Then disconnect electrical connector from ECT sensor and unscrew sensor from thermostat housing. Prepare that some coolant will come out when you remove this sensor if you never removed any coolant. Prior to fitting new ECT sensor wrap its threads with Teflon sealing tape to prevent leakages and corrosion of threads. It's a good idea if you have an old thread sealant on or rewrap threads with fresh teflon tape even if you plan on putting back your old ECT sensor. Fasten down and torque up until it gets tightened. Installation is otherwise a reverse of removal. Finally, check for necessary coolant level in relation to engine temperature. Begin running it until it reaches operating temperature as usual and then inspect for leaks where there might be some antifreeze dripping off somewhere at this point in time or is it just because of other reasons, Let's go back to expansion tank after engine has warmed up then cooled down.

The engine temperature sensor features two terminals, with twelve volts supplied to one terminal. The wire from the other terminal connects to the fast idle solenoid and the Housing Pressure Cold Advance solenoid within the injection pump. The switch contacts remain closed when the temperature is below 125°F (51°C), while at the calibration point, the contacts open, deactivating the solenoids. In scenarios above calibration, the circuit is closed, and similarly, it remains closed below calibration.

The coolant temperature indicator system includes an instrument panel lamp and a coolant temperature sensor or sender, situated at the left rear of the cylinder head on L4 engines, and at the rear of the right head on V6 engines. In place of a temperature sensor, the transducer replaces it if a temperature gauge is used on the instrument cluster. Where there is unusual indication or fault development, check first the coolant level in the system and then ensure that connecting wiring between gauge and sender unit is secure. When turning the ignition switch to the ON position with the starter motor turning, the indicator lamp should be illuminated (Overheated engine indication). The lamp may not be lit if; the bulb is burned out, the ignition switch is faulty or the circuit is open. Once the engine starts, the lamp should go out and remain so unless it overheats. The lamp may fail to go out because of a defective temperature sender unit or a faulty ignition switch or grounded wiring between the lamp and the sender unit. If you were going to change this Sensor unit, it would simply be unscrewed from the cylinder head after which another one could be installed in its place. There will be some loss of coolant so check levels after replacement has been installed.

The engine temperature sensor features two terminals, with twelve volts supplied to one terminal. The wire from the other terminal connects to the fast idle solenoid and the Housing Pressure Cold Advance solenoid within the injection pump. The switch contacts remain closed when the temperature is below 125°F (51°C), while at the calibration point, the contacts open, deactivating the solenoids. In scenarios above calibration, the circuit is closed, and similarly, it remains closed below calibration.

Never open, service, or drain the radiator or cooling system when hot, as serious burns can occur from steam and hot coolant. When draining engine coolant, be aware that ethylene glycol antifreeze can attract pets, which may ingest it from uncovered containers or puddles, leading to fatal consequences. Always drain coolant into a sealable container, and reuse it unless it is contaminated or several years old. The coolant temperature sensor, a thermistor, is mounted in the engine coolant stream, with low coolant temperature producing high resistance and high temperature causing low resistance. The PCM supplies a 5-volt signal to the ECT sensor and monitors the terminal voltage; high sensor resistance indicates low temperature, resulting in high PCM terminal voltage, while low sensor resistance indicates high temperature, lowering the terminal voltage. For 4.5L and 4.9L engines, relieve cooling system pressure, ensure the ignition is off, detach the electrical connector, and carefully remove the sensor. To install, coat the sensor threads with sealant, tighten to 15 ft.lbs., attach the connector, and check coolant levels. For the 4.6L engine, allow the cooling system to cool, partially drain it, disconnect the throttle control cable, remove the cruise control servo and bracket, detach the coolant sensor connector, and remove the sensor from the manifold. To install, apply a non-hardening sealer to the sensor threads, tighten to 106 inch lbs., reattach the connector, reinstall the cruise control servo and bracket, connect the throttle control cable, and fill the cooling system.

The engine coolant temperature sensor, a thermistor in the coolant stream, varies resistance with temperature. The PCM uses a 5-volt signal to determine the coolant temperature based on this resistance. Testing requires comparing resistance to a chart and checking against an automotive thermometer. If it's off-spec, replace the sensor. Located near the thermostat housing, ensure coolant is drained before removal. Coat the new sensor with thread sealant, tighten to the recommended torque, refill coolant, and reconnect the battery cable.

You can find the ECT sensor behind the engine, the edge facing the firewall and below the EGR valve. The first step of removing the ECT sensor is unplugging its cable from the negative battery cable. It is important to empty part of engine coolant before taking out ECT sensor from the vehicle, as it helps in reducing cooling loss. Then disconnect electrical connector from ECT sensor and unscrew sensor from thermostat housing. Prepare that some coolant will come out when you remove this sensor if you never removed any coolant. Prior to fitting new ECT sensor wrap its threads with Teflon sealing tape to prevent leakages and corrosion of threads. It's a good idea if you have an old thread sealant on or rewrap threads with fresh teflon tape even if you plan on putting back your old ECT sensor. Fasten down and torque up until it gets tightened. Installation is otherwise a reverse of removal. Finally, check for necessary coolant level in relation to engine temperature. Begin running it until it reaches operating temperature as usual and then inspect for leaks where there might be some antifreeze dripping off somewhere at this point in time or is it just because of other reasons, Let's go back to expansion tank after engine has warmed up then cooled down.

To test the Temperature Warning Light System, ensure the light turns on when the Ignition is on. If not, check the bulb. If the light remains on with a cold engine, disconnect the wire at the sending unit. If the light goes off, replace the unit. If it stays on, the wire is grounded in the harness. For the Temperature Gauge System, check the fuse if the gauge doesn't work. If the fuse is fine, disconnect the wire from the sending unit and ground it. Turn on the ignition; if the gauge registers at maximum, replace the unit. If not, the gauge or wiring may be faulty. To replace the sending unit, cool the engine, remove the cover, disconnect the wire, and unscrew the unit. Install the new unit, connect the wire, and replace the cover.

The coolant temperature indicator system includes a Cout and Temp light or gauge in the instrument panel and a coolant temperature sending unit connected to the engine; location varies according to type of engine. In the event that the light or gauge used to monitor the condition of the engine displays an indication of overheating, it is important to verify the fluid level of the engine especially that of the coolant further checking the wiring of the light or gauge and the sending unit and, checking all the fuses. An operating indicator light should come on in the cub if the engine of the automobile is overheating every time the ignition switch is turned on and the starter motor engaged. If it does not, there may be a problem with the light bulb, ignition switch or if there is an open circuit; to test the circuit put a ground on the wire while the ignition is on. Continued illumination of the light should make diagnose either faulty grounded wire, sending unit or ignition switch; it is also important to use the correct type of coolant as plain water may not properly switch on the sending unit. To replace the sending unit it simply requires to be unscrewed from the engine and a new one can be placed with a light coat of sealant on the screws so that it does not leak, it is also advisable to ensure the engine is cool so that little or no coolant is lost during the process, also the coolant level must be checked.

Ensure the engine is cool before removing the defective sending unit. Be prepared to catch some coolant loss as the unit is removed. Coat the threads of the new sending unit with sealant. Disconnect the electrical connector and unscrew the old sensor from the engine and install the replacement. After the replacement unit has been installed, check the coolant level and top up the system, if necessary. Now, check for proper operation of the gauge and sending unit.

The instrument panel contains a lamp and a sender unit. If the coolant level is normal after checking it, make sure that the wiring connecting to the gauge and sender unit is not loose. When turning on the ignition switch and the starter motor is set on motion, it should go off (overheated engine indication). In case it is not on then there might be a blown bulb, a defective ignition switch or an open circuit. Once started, the lamp should go out unless there is an overheating of the engine. The wire may have been grounded between the lamp and sender unit; temperature sender unit may be defective while in other cases ignition switch could be faulty leading to lamp failure to go out. One needs to unscrew it from left hand cylinder head and replace with new one if one wants to replace sender unit. There will be some loss of coolant hence check for its level after replacing.

The indicator system consists of a lamp mounted on the instrument panel and a sender unit which is located on the left-hand cylinder head. In case of unusual indication or developing fault, check the coolant level in the system and then ensure that the connecting wiring between the gauge and the sender unit is secure. When you turn your ignition switch ON and your starter motor rotates, your indicator lamp should be lit (over heated engine indications). If this lamp does not come on, it can be due to a burned bulb, faulty ignition switch or open circuit. As soon as you start your car engine, this lamp should go off and remain like that unless there is overheating of the engine. The lamp failing to go off may be because there is an earth leak between the lamp and sender unit, temperature senders defective ignition switch. To replace the sender unit it simply unscrews from left-hand cylinder head and replacement installed. There will be some loss of coolant so check level following fitting of new one.

The Engine Coolant Temperature (ECT) sensor is a thermistor, a resistor which varies the value of its resistance in accordance with temperature changes. The change in the resistance values will directly affect the voltage signal from the sensor to the ECM/PCM. As the sensor temperature increases, the resistance values will decrease and vice versa. Performing the following test will set a diagnostic trouble code and illuminate the Service Engine Soon light. Clear the diagnostic trouble code after performing the tests and making the necessary repairs. The engine coolant temperature sensor threads into a coolant passage at the front of the engine near the thermostat housing. Check the terminals in the connector and the wires leading to the sensor for looseness and breaks. Repair as required. Before checking the engine coolant temperature sensor, check the voltage supply and ground circuits from the ECM/PCM. Disconnect the electrical connector from the engine coolant temperature sensor and connect a voltmeter to the two terminals of the harness connector. Turn the ignition key On-the voltage should read approximately 5.0 volts. If the voltage is incorrect, check the wiring from the engine coolant temperature sensor to the ECM/PCM. If the circuits are good, have the ECM/PCM checked at a dealer service department or other properly equipped repair facility. With the ignition switch OFF, disconnect the electrical connector from the engine coolant temperature sensor. Using an ohmmeter, measure the resistance between the two terminals on the sensor while it is completely cold. Reconnect the electrical connector to the sensor, start the engine and warm it up until it reaches operating temperature, disconnect the connector and check the resistance again. Compare your measurements to the resistance chart. If the sensor resistance test results are incorrect, replace the engine coolant temperature sensor. A more accurate check may be performed by removing the sensor and suspending the tip of the sensor in a container of water. Heat the water on the stove while you monitor the resistance of the sensor. Wait until the engine is completely cool before beginning this procedure. Drain the cooling system. Disconnect the electrical connector from the sensor and carefully unscrew the sensor. Before installing the new sensor, wrap the threads with Teflon sealing tape to prevent leakage and thread corrosion. Installation is the reverse of removal.

Various engine sensors and components have checking procedures,the engine coolant temperature (ECT) sensor is a thermistor that changes resistance with temperature, and a failure in the circuit can cause trouble codes. The resistance should be measured when cold and warm while ensuring reference voltage from PCM is around 5.0 volts for the verification. Manifold Absolute Pressure (MAP) Sensor monitors changes in intake manifold pressure then varies its voltage output accordingly. Look at the reference voltage and signal voltage with the ignition on and engine off, and observe voltage changes as the engine's vacuum changes. Intake Air Temperature (IAT) Sensor acts as a thermistor where you can measure its resistance at different temperatures to make sure it changes as expected. Also, use a scan tool to monitor the IAT sensor for performance. The oxygen sensor in exhaust detects oxygen content which you can check its millivolt signal while warming up your engine. Check whether the oxygen sensor heater has correct voltage or not. Vehicle Speed Sensor (VSS) provides speed data to PCM which can be checked for reference voltage. Depending on the type of engine, Camshaft Sensor and Crankshaft Sensor should be checked for resistance and proper signal output. Finally, Knock Sensors detect engine knock which should be checked for reference voltage and resistance. If any component fails these checks, replacement may be necessary.

The indicator system has a lamp on the panel and a sender unit near the thermostat housing. Inspect the coolant level as well as the wiring. If it stays on, the wiring might be grounded, the coolant temperature sensor defective, or the ignition switch faulty. If the coolant temperature sensor needs replacing, unscrew it from the intake manifold.

First, the coolant temperature indicator system has a light in the instrument panel and a temperature-sending unit. If there's a temperature gauge, a transducer lets you replace the sending unit. Inspect the coolant and the wiring between the light/gauge and the sending unit.

Drain the cooling system below the ECT sensor level. Disconnect the electrical connector from the ECT sensor. Unscrew and remove the ECT sensor. If you're installing the old sensor, wrap the threads of the new ECT sensor with Teflon tape and the threads of the new sensor should already be coated with sealant. Installation is the reverse of removal. Be sure to tighten the ECT sensor to the torque specifications. Refill the cooling system.

Various engine sensors and components have checking procedures,the engine coolant temperature (ECT) sensor is a thermistor that changes resistance with temperature, and a failure in the circuit can cause trouble codes. The resistance should be measured when cold and warm while ensuring reference voltage from PCM is around 5.0 volts for the verification. Manifold Absolute Pressure (MAP) Sensor monitors changes in intake manifold pressure then varies its voltage output accordingly. Look at the reference voltage and signal voltage with the ignition on and engine off, and observe voltage changes as the engine's vacuum changes. Intake Air Temperature (IAT) Sensor acts as a thermistor where you can measure its resistance at different temperatures to make sure it changes as expected. Also, use a scan tool to monitor the IAT sensor for performance. The oxygen sensor in exhaust detects oxygen content which you can check its millivolt signal while warming up your engine. Check whether the oxygen sensor heater has correct voltage or not. Vehicle Speed Sensor (VSS) provides speed data to PCM which can be checked for reference voltage. Depending on the type of engine, Camshaft Sensor and Crankshaft Sensor should be checked for resistance and proper signal output. Finally, Knock Sensors detect engine knock which should be checked for reference voltage and resistance. If any component fails these checks, replacement may be necessary.

If a coolant temperature sensor wire circuit provides a flawed reading it may signal Code 14 or Code 15 to need wiring repair or sensor to be changed. To remove the sensor, the locking tab on the connector should be released and the connector disconnected from the sensor, the screw of the sensor should be unscrewed very slowly. Lay hands on the coolant sensor delicately since normal impacts can interfere with the operation of the fuel injection system. To improve its anti leakage and anti corrosion capability, wind round some Teflon sealing tape around the threads of the new sensor before installing and finally tightening it. Cases where the Manifold Air Temperature (MAT) sensor fixed at the air cleaner housing will cause Code 23 or Code 25. To remove it, disconnect the wire harness and unscrew the sensor; to install it follow the inverse procedure. The Manifold Absolute Pressure (MAP) sensor monitors pressure fluctuations in the intake manifold due to load or speed of the engine; failure results to code 33 or code 34 and affects fuel supply and timing of the ignition. Exhaust oxygen sensor, installed in the exhaust manifold, controls oxygen content and assists ECM to modify the fuel mix. The presence of an open oxygen sensor triggers Code 13 while low and high voltage conditions trigger both Code 44 and Code 45, the symptoms of which can also be associated with fuel system problems. The Turbocharger Boost Control Solenoid is a solenoid located in the intercooler pipe and is controlled by the ECM with reference to boost pressure and engine speed; a faulty Turbocharger Boost Control Solenoid may cause Code 23 which can result in turbocharger lag and richness in fuel delivery. The Park/Neutral switch informs the ECM when the transaxle is in Park or Neutral, which affects Transaxle Converter Clutch and idle air control valve; if this switch is disconnected while driving, it will cause idle quality problems and false codes. The ECM is connected to the starter solenoid to monitor engine cranking while the A/C 'On' signal in turn helps the A/C selector switch position for change in idle speed. The vehicle speed sensor transmits a pulse voltage signal to the ECM and this is converted into miles per hour to control TCC system, the distributor incorporates signals to ECM concerning the rpm and crankshaft position of the engine.

The coolant temperature indicator system has a light or gauge in the instrument panel and a temperature sending unit on the engine. The location varies by engine size. Some vehicles have a low coolant warning system with a light and sensor on the radiator. If overheating or low coolant is indicated, check coolant levels and wiring. Ensure fuses are intact. When ignition is on, indicators should light up for overheating or low coolant. If not, possible issues include a burned-out bulb, faulty ignition switch, or open circuit. To test, ground the sender wire with ignition on; if the gauge responds, replace the sending unit. Once the engine starts, the light should remain off unless there's an issue. If it stays on, possible causes are a grounded wire, defective sender, or faulty ignition switch. When replacing sending units, ensure the engine is cool and check coolant type. Replace sensors by draining some coolant and disconnecting connectors. Refill coolant after installation.

The coolant temperature indicator system comprises a dashboard-mounted gauge and an engine-mounted sensor, which also informs the fuel and emissions systems. If overheating is indicated, check the coolant level and sensor operation. A defective sensor should be replaced. If the sensor is functional, the temperature gauge should be assessed by a dealer using a scan tool, as the onboard computer processes the data.

The engine coolant temperature sensor threads into a coolant passage at the front of the engine near the thermostat housing.

Wrap the threads of the sensor with Teflon sealing tape to prevent leakage.

After draining the cooling system, you should disconnect the electrical connector and unscrew the sensor.

If any component fails these checks, replacement may be necessary.

If the gauge needle deflects to full hot during the test, it means that the gauge is okay.