十一月 28th, 2009 13:05
keyword: 1 sensor signals, the computer power cord failures would worsen the performance of automobile engines, economic decline, the car carrying the replacement computer should be operational before the first examination of computer power cord. (Power cord should be included in the ground are integrity is the power cord). 2, if the oxygen sensor voltage signal is higher than standard value, the sensor may be contaminated, a lot of time in this case, it would Biannong the air-fuel ratio. 3, if the oxygen sensor voltage signal less than the standard value, the sensor failure may be that it would lead to the engine air-fuel ratio-thinning. 4, checking oxygen sensors to be used digital multimeter, or oscilloscope. 5, the heater if oxygen sensor malfunction, it is likely to extend the open-loop engine working hours so that the increased volume of fuel. 6, engine coolant temperature sensor can be digital or analog form table to check its performance. 7, some of the computer’s circuit ECT, in a temperature of the engine will control an internal resistor to change the voltage on the sensor, measurement, if met in this time of the abnormal voltage, the sensor does not mean that there are failures. 8, the test engine coolant temperature sensor and temperature sensor into the can use the same operating procedures, only need to pay attention to their temperature curve, at the same temperature so that there will not be the same voltage signal. 9, in the open throttle, check throttle position sensor voltage signal, through the appropriate intensity of the vibration sensors to check the stability of some of the virtual circuit then the fault in this way is very effective. 10, many of the four-wire throttle-position sensor contains an idle position switch to a throttle in the idle position when the engine control unit to provide engine work status information. 11, in some cases, you can let go of the throttle position sensor fixed screw, rotation sensors to adjust the shell at idle throttle position voltage signal. 12, if the intake manifold absolute pressure sensor output signal frequency that can not be an ordinary multimeter to test it. 13, many of the intake manifold absolute pressure sensor output by the atmospheric pressure into voltage signals, such signals can be connected to the ignition switch to check the way it’s good or bad. (This can only prove that sensors can work, if the output decline in accuracy in this way is not to check.) 14, checking in intake manifold absolute pressure sensor output voltage signals, the sensors should be within a certain The vacuum. In most cases every 10 kPa detect a signal of its output will be able to judge. 15, the slab measured wing air flow sensor voltage signal in the sensor from the wing to full-wide clearance in the process of inspection, observation of the output voltage and continuity. 16, some resistance or hot-air-flow sensors by the engine computer to provide the frequency of the voltage signal change, such sensors can only be used to test the frequency of the multimeter to check the voltage. 17, EGR valve position sensor voltage signal will close the valve when the valve 0.8V to 4.5V between the full-time change. 18, a computer with the speed sensor signals to control the torque converter clutch, when the exercise of the shift, and driving the computer data acquisition.