Saturn 12160244 Sensor,Intake Air Temperature

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The sensor for Intake Manifold Temperature (IMT) stands right at the air cleaner on the air intake duct. To start with, one must remove the cable from a negative battery terminal. Next, detach the electrical connector from the MAF/IMT sensor. After that, it is important to unscrew the screws that hold MAF/IMT sensor to both the air filter housing and the air intake duct. It must be taken off from either place. Finally, reinstalling is a simple thing as described above.

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 vice versa. The PCM supplies a 5-volt signal to the sensor and measures the voltage to calculate the incoming air temperature. The sensor signal is used to adjust spark timing based on air density.

First of all, the key should be taken out from the ignition lock cylinder. The Intake Manifold Temperature Sensor on four-cylinder cars is placed in the intake air duct; it requires a disconnected electrical connector from the Intake Manifold Temperature Sensor before twisting and pulling it off the air duct. Inspect the rubber grommet and if damaged it needs to be replaced, as for the installation it is the reverse of the removal process. On the 2002 and 2003 V6 models, the Intake Manifold Temperature Sensor is actually integrated into the Mass Air Flow (MAF) sensor. On 2004 and later V6 models, the Intake Manifold Temperature Sensor is located on the front side of the air filter housing, unplugging the electrical connector and removing the sensor from the housing, checking the condition of the rubber grommet and replacing if necessary with reinstallation being the opposite of the removal process. Also, there is the other Intake Manifold Temperature Sensor located by the throttle body; pull the wiring harness connector using the button on the connector top, then unscrew the sensor from the intake manifold. Replace and throw away the previous Intake Manifold Temperature Sensor O-ring and install a new one and make sure it is well fixed by tightening the Intake Manifold Temperature Sensor.

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 coolant sensor is a thermistor and is a voltage that changes with temperature and a break in the circuit of this thermometer can cause Code 14 or Code 15 or a broken wire repair or replace the sensor. To uninstall the sensor, unlock it, disconnect the cable, and screw it out, albeit delicately for there is danger of causing some harm to the fuel injection system. Prior to the installation of the new sensor use Teflon sealing tape over the threads in order to avoid leakage and corrosion, to install undo this process in reversed manner. The Manifold Absolute Pressure (MAP) sensor measures intake manifold pressure changes and translates it to a voltage signal for the ECM to modulate the fuel flow and ignition timing; a bad one will produce Codes 33, 34, 63, or 64, and if diagnosed with a problem, the unit must be replaced. The second type of thermistor, also installed in the air cleaner housing is the Manifold Air Temperature (MAT) sensor that prompts the ECM to delay EGA until the MAT is 40-degrees F; failures are indicated by Code 23 or Code 25; removal involves unpin the connector and use a wrench. MAF sensor checks the quantity of air getting to the motor with a high frequency failure Code 33 and a low frequency failure or power loss setting Code 34 and may present Codes 44 or 45; replacement involves the removal of the connector then the clamps thus lifting it off the vehicle. This sensor migrates in the exhaust system and measures the oxygen content and sends signals to the ECM when necessary for the fuel mixture and when indicates a circuit problem with a code 13, 44 or 45. Throttle position sensor is found on the throttle body inlet or directly on the throttle shaft, and the voltage output is useful in programming of fuel delivery with reference to throttle angle; this can cause codes 21 or 22; if replacement is required then there is a detailed process provided. The Park/Neutral switch, also placed on the automatic transaxle, informs the ECM that it is in Park or Neutral and determines TCC, EGR, and IAC control; it should not be disconnected while driving to prevent idle quality problems and Code 24. The A/C On signal sends a message to the ECM that the A/C is turned on to enable it to correct the idle speed and any circuit diagnostics should be done with the help of a dealer. The VSS sends an intermittent voltage signal to ECM to sense the speed and the crank shaft sensor is used to sense the position of the engine in terms of rpm.

Take the cable away from the negative battery terminal. This sensor is found on the air intake duct for 4.3L V6 and 5.0L, 5.7L, and 7.4L V8 engines as indicated below. Take off the Intake Manifold Temperature Sensor's electrical connector. In case of a vehicle with a 4.3L V8 or a 5.0L, 5.7L, or 7.4L V8 engine, you should just disconnect the electrical connector and pull it out of its mounting hole in the intake duct by holding firmly onto it. Grasp it firmly and carefully remove the Intake Manifold Temperature Sensor from the air intake duct of your vehicle with firmness and care to avoid any damage that might be caused to either the sensor or the air intake duct itself when removing it out of there by pulling gently but forcefully against resistance or twisting one way then another before lifting up off its mount point near where the other wires are attached nearby; you can also use pliers if necessary but make sure not to break anything while doing so! The Intake Manifold Temperature Sensor is removed by holding it tightly and pulling out of an air intake duct. All cracks, tears, and deteriorations are inspected around an Intake Manifold Temperature Sensor mounting hole in an air intake duct. Replace the intake duct if there is any damage on the mounting hole. Installation is done in reverse order as compared to removal operations: for example, what was removed first should now be installed last while what was installed last becomes the first part that should be removed prior to the installation process beginning all over again at each step along the way until everything has been put into the correct place exactly where needed which would require following the proper sequence according to the plan provided here within these instructions given previously such as referring back through one page only instead of going through the whole book all at once without any reference points whatsoever except those mentioned above concerning the order followed during the disassembly stage according to the schedule prepared from the original manufacturer's manual, etc. This is true for 4.8L, 5.3L, and 6.0L V8 engines wherein the Intake Manifold Temperature Sensor is one of the parts of the Mass Air Flow (MAF) sensor.

The Intake Manifold Temperature (IMT) sensor is a thermistor, a resistor that changes its resistance value with temperature. The voltage signal from the sensor to the PCM will be directly affected by this change in the resistance values. Resistance values decrease as the sensor temperature increases. The resistance values, however, increase as the sensor temperature goes down. It should be noted that only 1996 through 2000 models are equipped with an IMT sensor. This test sets a diagnostic trouble code and illuminates the Service Engine Soon light. Clearing the diagnostic trouble code after performing tests is mandatory together with making necessary repairs. One can find the Intake Manifold Temperature (IMT) sensor installed either in the air intake duct near the air cleaner or in it. Check that there are no loose terminals in the connector and breakages on wires leading to the sensor first of all. Make repairs where necessary. Before checking intake manifold temperature sensor, check PCM voltage supply and ground circuits. Disconnect electrical connector from IMT Sensor and connect positive lead of voltmeter to tan wire terminal and negative lead to black wire terminal at harness connector. Turn ignition switch ON- voltage reading should be approximately 5.0 volts. If voltage is not correct; check wiring between sensor and PCM. If circuits are good, then have PCM checked at dealer service department or other properly equipped repair facility. Disconnect electrical connector from IMT sensor with ignition switch OFF. With an ohmmeter measure resistance between two Intake Manifold Temperature sensor terminals on sensor while completely cold (50 to 80-degrees F). Reconnect electrical connector to sensor start engine and warm up until operating temperature is reached (180 to 200-degrees F), disconnect connector again, measure resistance. Compare your measurements against resistance chart for this vehicle. Should there be incorrect results of this test, replace intake manifold temperature sensor. A more accurate check may be performed by removing air intake duct and heating the sensor, with a heat gun or hair dryer while you monitor the resistance of the sensor. Disconnect electrical connector from sensor. Carefully remove sensor from air intake duct or air cleaner assembly. Installation is 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 Intake Manifold Temperature Sensor is a thermistor. This sensor changes its resistance values in correspondence with temperature. As the sensor's temperature increases, the sensor's resistance values decrease. On the contrary, as the sensor's temperature decreases, the resistance values of the sensor increase. First, remove the electrical connector to replace an Intake Manifold Temperature Sensor. Second, twist and pull out the unit from the air intake duct. The installation process is simple- just do opposite steps of the removal process.

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.

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.

To remove the Intake Manifold Temperature Sensor on 2.0L supercharged models, start by turning the ignition key to OFF. Disconnect the electrical connector from the sensor located near the ECT, below it, and behind the snout of the supercharger drive.

For four-cylinder models, ensure the ignition key is turned to OFF, then disconnect the electrical connector from the Intake Manifold Temperature Sensor and remove the sensor from the air intake duct. Inspect the rubber insulator grommet for any cracks, tears, or deterioration, and replace it if damaged. Installation follows the reverse order of removal. In V6 models, the Intake Manifold Temperature Sensor is an integral part of the Mass Air Flow (MAF) sensor.

The Engine Coolant Temperature (ECT) sensor is normally located near the thermostat or at any rate, wherever the thermostat is mounted; for the Luxgen 3.4L, the sensor is sited towards the rear of the right cylinder head on the lower intake manifold . It also works as a thermistor, that is, its resistance decreases or increases depending on the temperature. When you plan to install a new sensor, it is better to thread the wires with Teflon sealing tapes to avoid leakage and corrosion. In order to uninstall the sensor, one has to unlock the locking tab, disconnect the electrical connector and, carefully, unscrew the sensor as its damage might provoke a failure in the fuel injection system. Installation is done in the reverse sequence as well, and levels of coolant have to be checked afterward. MAF is an intake air sensor mounted in the air intake tube between throttle body and air cleaner housing or on the throttle body on 1995 and later 3800 models. It measures the air, getting into the engine and, in some engines, it could be supplemented by the MAP sensor. To remove the MAF sensor, one has to unplug the electrical connector, unscrew the clamps and then remove it. For the 1995 and later 3800 engines to remove the sensor one has to take out screws thus to interpolate it one has to reverse the procedure of removal. The Manifold Absolute Pressure (MAP) sensor is located at the front of the engine on 1995 and later 3800 engines, this is on the upper intake manifold or firewall. It also checks on changes in the intake manifold pressure occasioned by changes in the engine load and speed. To dismantle it, first, disconnect the vacuum hose, pull the electrical connector and then unbolt the mounting screws. On 3.4L models, the retaining bracket and bolt must be removed, then pull it straight up; On 1995 and later models, the retaining clips must be disengaged. The Intake Air Temperature or (IAT) sensor is located downstream of the air filter, or in the housing of the air cleaner and performs the thermistor role. To remove it, disconnect the electrical connect or unscrew or twist it from its place and for installation twisting or screwing the electrical connector in place is done. Instruments called oxygen sensors, fitted in the exhaust manifold or pipe, measure the oxygen in the exhaust emissions and supply a voltage signal to the PCM to regulate the mixture. These are the following special precautions for the pigtail and the electrical connector; no contact with contaminants, and must have ample airflow to the IP67 rating standard. To remove an oxygen sensor, you have to remove the battery, lift the car, remove any heat shields around the sensor, remove an electrical connector and then unscrew the sensor; before tightening the new sensor, apply anti seize to the threads. Tps is an electro-mechanical device positioned on the throttle shaft of the throttle body whereby its main function is to detect the position of the throttle valve. Crankshaft position sensors depends with the kind of engine as some may have a single sensor and others a dual sensor which are all used to monitor crankshaft position and speed for ignition control. Replacement entails removal of the battery, the electrical connector as well as the sensor, while installment is the process of the vice versa. This is typically found at the front of the engine block or may be mounted on the left cylinder head and generates a signal for the PCM for the intake stroke of number one piston. The Vehicle Speed Sensor (VSS) is installed at the rear of the transaxle housing which employs an electrical pulse and voltage signal to the PCM for the measurement of speed. In its stead, pull the retaining bolt and disconnect the sensor. Controls the park/neutral function when the automatic transaxle is engaged and controls various systems based on whether the transaxle is in 'Park' or 'Neutral'; should not be disconnected during driving. Part of the steering gear, the Power Steering Pressure Switch conveys information to the PCM about high hydraulic pressure and influences engine idle and air conditioning; to remove it, one has to detach the electrical connector and unscrew the sensor.

For four-cylinder models, ensure the ignition key is turned to OFF, then disconnect the electrical connector from the Intake Manifold Temperature Sensor and remove the sensor from the air intake duct. Inspect the rubber insulator grommet for any cracks, tears, or deterioration, and replace it if damaged. Installation follows the reverse order of removal. In V6 models, the Intake Manifold Temperature Sensor is an integral part of the Mass Air Flow (MAF) sensor.

It may be necessary to use pins or straightened paper clips to backprobe the sensor electrical connector wires, taking care not to short the probes.

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.

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.

The MAF/IAT sensor is applicable only to 2002 and 2003 V6 models.