Dependence of the change in resistance of the temperature sensor of the air entering the engine on the temperature
The intake manifold absolute pressure sensor induces a signal from 4 V in the absence of vacuum to 0.5 V in the presence of vacuum.
 |  |
1. Turn on the ignition, but do not start the engine and check the voltage from the MAP sensor, which on the red wire should be about 5 V.
2. Remove the vacuum hose from the MAP sensor and connect a hand vacuum pump in its place.
3. Disconnect the electrical connector from the MAP sensor. Using a voltmeter, check the voltage induced by the MAP sensor on the black/yellow wire. With no vacuum, the voltage should be approximately 4 volts, and when vacuum is applied, it should decrease to 0.5 volts.
4. The engine air temperature sensor is located inside the air filter housing. The sensor's resistance changes depending on the amount of air entering the engine.
[The original can be found on this resource: www.toyotaman.ru]
5. To check the engine air temperature sensor, remove the electrical connector from the sensor, turn on the ignition, but do not start the engine.
6. Measure the voltage at the electrical connector, which should be 5 V.
7. Connect an ohmmeter to the engine air temperature sensor contacts and measure the sensor resistance at different temperatures.