Fault analysis: The ground wire of the intake air temperature sensor is in poor contact, the data flow will show abnormally low temperature, and the low temperature air density is high, which will increase the fuel injection pulse width and cause the mixed steam to be too dense. When the sensor is short-circuited, the data stream will show abnormally high temperature, and the high temperature air density will be low, which will reduce the fuel injection pulse width and cause the mixed steam to be too lean. The higher the temperature of the intake air temperature sensor, the richer the mixed steam, the sensor open circuit or poor grounding will cause the mixed steam to be too lean, resulting in difficulty in starting.
Resistance detection: During single-piece detection, turn the ignition switch to the OFF position, unplug the connector of the intake air temperature sensor wire, and remove the sensor, use an electric blower, infrared lamp or hot water to heat the intake air temperature sensor, and use a multimeter to ohmic Measure the resistance value between the two terminals at different temperatures, and compare the measured resistance value with the standard value. If it does not match the standard value, the intake air temperature sensor should be replaced.