Toyota 89424-12010 Sensor, Inlet Air Temperature

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Almost all components are under a Federally required three-year / 36,000-mile warranty, and as a result, it's nearly impossible to test or swap them to check the effectiveness of the warranty. As you can see, it may be cheaper to do the checks or replacements once the free warranty has been used up. The oxygen sensor of the STL type, installed in the exhaust manifold, sensors the concentration of oxygen in the gases; the second sensor checks the emission level in the catalytic converter. An open or shorted oxygen circuit will endorse a code 21 or 27. The coolant temperature sensor, a thermistor in the thermostat housing or behind the distributor, will set code 22 if it goes bad. To confirm it, disconnect the connector, take resistance between terminals and if not at the right range replace it with a new one and solder it with Teflon tape or thread sealant. The intake AIR temperature sensor which is located in the air cleaner housing monitors the temperature of air entering intake manifold, consequently controls the fuel and sets a code 24 if the sensor is faulty. Diagnosis is something that should be conducted by the dealer. Air volume for fuel delivery control is measured by the air flow meter near the air cleaner, which may set a code 31 if faulty, and the diagnosis is suggested to be handled by a dealer. The vacuum sensor measures changes in intake manifold pressure converting them into voltage in the fuel delivery and ignition timing the code 31 also sets if it fails, in which case the vacuum sensor needs to be replaced if found faulty. This is located on the throttle body and assists the ECM calculate the fuel delivery that is proportional to the throttle angle; if this sets a code 41, it will require the help of the dealer or replacement. The transaxle position switch located on POS and NEU also affects the fuel injectors as well as the ISC solenoid valve on automatic transaxles. If A/C amplifier is absent, it puts out a code 51 and the dealer needs to diagnose when it signals the ECM that A/C is on and permits adjustments for load on the engine. The speedometer with VSS is the one that produces a pulsing voltage signal to the ECM to facilitate the display of speed, with a code 42 set if it is not available, and diagnosis recommended at the dealer. The distributor produces crank angle pulse signal for calculating the engine speed of the vehicle in turn control the speed. Cranking is informed to the ECM by the engine start signal from the starter circuit, while, pertaining to fuel injectors, code 43 is set if missing or is intermittent.

The coolant temperature sensor on four-cylinder engines is located on the rear of the cylinder head, while on the 3.0L V6 engine, it is found on the intake manifold beneath the air intake plenum at the rear, and on the 3.4L V6 engine, it is positioned behind the timing belt cover on the top of the intake manifold. Before installing a new sensor, wrap the threads with Teflon sealing tape to prevent leakage and corrosion. To remove the sensor, release the locking tab, unplug the electrical connector, and carefully unscrew it, taking care not to damage the sensor as it affects the fuel injection system. Install the new sensor quickly to minimize coolant loss and check the coolant level afterward. The Mass Airflow Sensor (MAF) is located on the air intake duct and measures the mass of air entering the engine; to replace it, disconnect the electrical connector, remove the air cleaner assembly, and lift the MAF sensor assembly from the air cleaner. The vane airflow sensor, found on 1993 and 1994 3.0L V6 engines, measures the volume of air entering the engine and is removed similarly. The Intake Air Temperature (IAT) sensor is located inside the air cleaner housing and is removed by unplugging the electrical connector and twisting it out of the rubber boot. Oxygen sensors, which monitor the oxygen content of exhaust gases, are located in the exhaust manifold or pipe; precautions include avoiding damage to the pigtail and ensuring air circulation to the sensor. Disconnect the battery before removing the oxygen sensor, and use anti-seize compound on the threads during installation. The Throttle Position Sensor (TPS) measures the throttle valve position and is located on the throttle body; it is removed by disconnecting the electrical connector and unscrewing it. The crankshaft position sensor is mounted in the timing cover for four-cylinder engines and on the oil pump for 3.4L V6 models, while the camshaft position sensor is located above the intake manifold for four-cylinder models and behind the timing belt cover for 3.4L V6 models. Knock sensors, located below the intake manifold, control spark knock by retarding ignition timing and require coolant drainage for access. The Vehicle Speed Sensor (VSS) is found at the rear of the transmission housing and sends a voltage signal to the ECM. Lastly, the EGR gas temperature sensor, mounted near the EGA valve, detects exhaust temperature and regulates EGA on/off time efficiently.

The coolant temperature sensor on four-cylinder engines is located on the rear of the cylinder head, while on the 3.0L V6 engine, it is found on the intake manifold beneath the air intake plenum at the rear, and on the 3.4L V6 engine, it is positioned behind the timing belt cover on the top of the intake manifold. Before installing a new sensor, wrap the threads with Teflon sealing tape to prevent leakage and corrosion. To remove the sensor, release the locking tab, unplug the electrical connector, and carefully unscrew it, taking care not to damage the sensor as it affects the fuel injection system. Install the new sensor quickly to minimize coolant loss and check the coolant level afterward. The Mass Airflow Sensor (MAF) is located on the air intake duct and measures the mass of air entering the engine; to replace it, disconnect the electrical connector, remove the air cleaner assembly, and lift the MAF sensor assembly from the air cleaner. The vane airflow sensor, found on 1993 and 1994 3.0L V6 engines, measures the volume of air entering the engine and is removed similarly. The Intake Air Temperature (IAT) sensor is located inside the air cleaner housing and is removed by unplugging the electrical connector and twisting it out of the rubber boot. Oxygen sensors, which monitor the oxygen content of exhaust gases, are located in the exhaust manifold or pipe; precautions include avoiding damage to the pigtail and ensuring air circulation to the sensor. Disconnect the battery before removing the oxygen sensor, and use anti-seize compound on the threads during installation. The Throttle Position Sensor (TPS) measures the throttle valve position and is located on the throttle body; it is removed by disconnecting the electrical connector and unscrewing it. The crankshaft position sensor is mounted in the timing cover for four-cylinder engines and on the oil pump for 3.4L V6 models, while the camshaft position sensor is located above the intake manifold for four-cylinder models and behind the timing belt cover for 3.4L V6 models. Knock sensors, located below the intake manifold, control spark knock by retarding ignition timing and require coolant drainage for access. The Vehicle Speed Sensor (VSS) is found at the rear of the transmission housing and sends a voltage signal to the ECM. Lastly, the EGR gas temperature sensor, mounted near the EGA valve, detects exhaust temperature and regulates EGA on/off time efficiently.

The intake manifold temperature sensor is a thermistor that changes its resistance values in accordance with temperature changes, directly affecting the voltage signal from the sensor to the PCM. Any problem in the intake manifold temperature sensor circuits will set a diagnostic trouble code. On four-cylinder models, the intake manifold temperature sensor is located in the air cleaner assembly and can be disconnected from its electrical connector to measure the resistance between the two terminals using an ohmmeter. To replace the intake manifold temperature sensor, ensure the ignition key is in the OFF position, disconnect the electrical connector, and remove the sensor from the air cleaner. Installation is the reverse of removal.

The coolant temperature sensor on four-cylinder engines is located on the rear of the cylinder head, while on the 3.0L V6 engine, it is found on the intake manifold beneath the air intake plenum at the rear, and on the 3.4L V6 engine, it is positioned behind the timing belt cover on the top of the intake manifold. Before installing a new sensor, wrap the threads with Teflon sealing tape to prevent leakage and corrosion. To remove the sensor, release the locking tab, unplug the electrical connector, and carefully unscrew it, taking care not to damage the sensor as it affects the fuel injection system. Install the new sensor quickly to minimize coolant loss and check the coolant level afterward. The Mass Airflow Sensor (MAF) is located on the air intake duct and measures the mass of air entering the engine; to replace it, disconnect the electrical connector, remove the air cleaner assembly, and lift the MAF sensor assembly from the air cleaner. The vane airflow sensor, found on 1993 and 1994 3.0L V6 engines, measures the volume of air entering the engine and is removed similarly. The Intake Air Temperature (IAT) sensor is located inside the air cleaner housing and is removed by unplugging the electrical connector and twisting it out of the rubber boot. Oxygen sensors, which monitor the oxygen content of exhaust gases, are located in the exhaust manifold or pipe; precautions include avoiding damage to the pigtail and ensuring air circulation to the sensor. Disconnect the battery before removing the oxygen sensor, and use anti-seize compound on the threads during installation. The Throttle Position Sensor (TPS) measures the throttle valve position and is located on the throttle body; it is removed by disconnecting the electrical connector and unscrewing it. The crankshaft position sensor is mounted in the timing cover for four-cylinder engines and on the oil pump for 3.4L V6 models, while the camshaft position sensor is located above the intake manifold for four-cylinder models and behind the timing belt cover for 3.4L V6 models. Knock sensors, located below the intake manifold, control spark knock by retarding ignition timing and require coolant drainage for access. The Vehicle Speed Sensor (VSS) is found at the rear of the transmission housing and sends a voltage signal to the ECM. Lastly, the EGR gas temperature sensor, mounted near the EGA valve, detects exhaust temperature and regulates EGA on/off time efficiently.