Cadillac 12160244 Sensor,Intake Air Temperature

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The MAF/Intake Manifold Temperature Sensor is located on the air intake duct, next to the air cleaner, specifically at the air filter housing. Start by disconnecting the cable from the negative battery terminal. Then, disconnect the electrical connector from the MAF/Intake Manifold Temperature Sensor. Proceed to loosen the clamp screws that retain the MAF/Intake Manifold Temperature Sensor to the air filter housing and air intake duct. Detach the sensor from the housing and duct. The process of installation is simply the reverse of removal.

The Intake Manifold Temperature (IMT) sensor is a thermistor that measures the temperature of the air entering the engine. It has a high resistance at low temperatures and a low resistance at high temperatures. The PCM supplies a 5 volt signal to the sensor and measures the voltage to calculate the incoming air temperature. The IMT sensor signal is used to adjust spark timing based on air density. To test the sensor, connect a digital ohmmeter and compare the resistance to the ambient air temperature. Heat the sensor slightly and observe the temperature and resistance. If the sensor does not meet specifications, it should be replaced. To remove the sensor, disconnect the negative battery cable and remove the intake manifold cover. For a 4.6L engine, remove the IMT sensor from the fuel rail. For a 4.9L engine, unscrew the IMT sensor from the intake manifold. Installation is the reverse of the removal procedure, ensuring to coat the threads with a nonhardening sealant before installing the sensor.

The checking procedures for various engine sensors and components are as follows: The engine coolant temperature (ECT) sensor is a thermistor that changes resistance with temperature, and a failure in the circuit can trigger trouble codes. To check it, measure the resistance while cold and warm, and ensure the reference voltage from the PCM is around 5.0 volts. The manifold absolute pressure (MAP) sensor monitors intake manifold pressure changes and varies its voltage output accordingly. Check the reference voltage and signal voltage with the ignition on and engine off, and observe voltage changes as the engine's vacuum changes. The intake air temperature (IAT) sensor acts as a thermistor, and you can measure its resistance at different temperatures to ensure it changes as expected. Also, monitor the IAT sensor using a scan tool to verify its performance. The oxygen sensor in the exhaust monitors oxygen content, and you can check its millivolt signal while the engine warms up. Inspect the oxygen sensor heater and ensure it receives proper voltage. The vehicle speed sensor (VSS) provides speed data to the PCM and can be checked for reference voltage. The camshaft sensor and crankshaft sensor, depending on the engine type, should be checked for resistance and proper signal output. Finally, the knock sensors detect engine knock and should be checked for reference voltage and resistance. If any component fails these checks, replacement may be necessary.

Before checking the IAT sensor itself, you should check the voltage supply and ground circuits from the PCM. Additionally, inspect the connector terminals and wires leading to the sensor for looseness and breaks, and repair them if necessary.

The final step in the installation process is to reverse the steps of removal.

For these engines, it's important to note that on supercharged 6.2L (LS9) engines, the Intake Air Temperature (IAT) sensor is a separate sensor mounted on the charge air cooler. The MAF sensor is located on the side of the intake air duct portion of the air filter housing.

Disconnect the cable from the negative battery terminal. For 4.3L V6 and 5.0L, 5.7L and 7.4L V8 engines, note that the Intake Manifold Temperature Sensor is located on the air intake duct. Disconnect the electrical connector from the Intake Manifold Temperature Sensor. To remove the Intake Manifold Temperature Sensor from the air intake duct on a 4.3L V8 or a 5.0L, 5.7L or 7.4L V8 engine, simply disconnect the electrical connector, then grasp the sensor firmly and carefully pull it out of its mounting hole in the intake duct. To remove the Intake Manifold Temperature Sensor, grasp it firmly and carefully pull it out of the air intake duct. Inspect the Intake Manifold Temperature Sensor mounting hole in the air intake duct for cracks, tears and deterioration. If the mounting hole is damaged, replace the air intake duct. Installation is the reverse of removal. For 4.8L, 5.3L and 6.0L V8 engines, the Intake Manifold Temperature Sensor is an integral component of the Mass Air Flow (MAF) sensor.

The Intake Manifold Temperature (IMT) 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 PCM. As the sensor temperature increases, the resistance values will decrease. As the sensor temperature decreases, the resistance values will increase. Only 1996 through 2000 models are equipped with an IMT sensor. 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 Intake Manifold Temperature sensor is mounted either in the air intake duct near the air cleaner or in the air cleaner. Check the terminals in the connector and the wires leading to the sensor for looseness and breaks. Repair as required. Before checking the intake manifold temperature sensor, check the voltage supply and ground circuits from the PCM. Disconnect the electrical connector from the IMT sensor and connect the positive lead of a voltmeter to the tan wire terminal and the negative lead to the black wire terminal at 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 sensor to the PCM. If the circuits are good, have the PCM checked at a dealer service department or other properly equipped repair facility. With the ignition switch OFF, disconnect the electrical connector from the IMT sensor. Using an ohmmeter, measure the resistance between the two Intake Manifold Temperature sensor terminals on the sensor while it is completely cold (50 to 80-degrees F). Reconnect the electrical connector to the sensor, start the engine and warm it up until it reaches operating temperature (180 to 200-degrees F), 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 intake manifold temperature sensor. A more accurate check may be performed by removing the air intake duct and heating the sensor, with a heat gun or hair dryer while you monitor the resistance of the sensor. Disconnect the electrical connector from the sensor. Carefully remove the sensor from the air intake duct or the air cleaner assembly. Installation is the reverse of removal.

The Intake Manifold Temperature Sensor is a thermistor, a resistor which alters its resistance value in response to temperature changes. This change in resistance directly impacts the voltage signal sent from the sensor to the PCM. As the sensor temperature rises, the resistance values fall. Conversely, as the sensor temperature falls, the resistance values rise. To replace the Intake Manifold Temperature Sensor, first disconnect the sensor's electrical connector. Then, twist and pull the sensor out from the air intake duct. The installation process is simply the reverse of the removal process.

To remove the Intake Manifold Temperature Sensor on 2.0L supercharged models, start by turning the ignition key to OFF. Then, disconnect the electrical connector from the sensor located near the ECT, below it, and behind the snout of the supercharger drive. Next, remove the Intake Manifold Temperature Sensor mounting bolt and twist the sensor while withdrawing it. For 2.2L and 2.4L models, also turn the ignition key to OFF and disconnect the electrical connector from the sensor. Remove the Intake Manifold Temperature Sensor from the air intake duct and inspect the rubber insulator grommet for any damage. If it is cracked, torn, or deteriorated, replace it. To install, simply follow the reverse steps of removal.