129743476857656250_76Symptom: the China-made Audi A6 (quotes pictures parameter) 2.4L, petrol table no, hands indicate the oil is sometimes more and sometimes less, gasoline oil level warning light sometimes light and warning light lit that is pointed at a table full of gasoline. Pentium decodes them with gold first meter reading meter system for fault codes, display system is functioning properly. Perform functional testing, Fuel Level IndicatorLocation full of needles from empty to full swing, description normal petrol table itself. Check and repair: find a circuit diagram. Under the roadmap, the car has an oil level sensor not only, also has an oil level switch. But in the actual disassembly process, liquid level switch and didn't find this component may be models do not match. Only a four wire plug on the fuel tank. 2 of them areFuel pump power supply line, the rest of the 2 is the oil level sensor.
Estimated meter computer calculated using sensor signal voltage alert. First suspect is the fuel float has failed. Apart from the reserve compartment cover, disconnect the fuel pump plug, turn the ignition switch, measuring voltage plug 2, 3 feet, 1. Swing more than 35V. Then, with the view of oscilloscope measurements andCha sensor plugs on the waveform, not when you plug the sensor, voltage waveform for a 5V square wave, frequency is 100HZ. With the decrease of float resistance
rs items for sale, the amplitude of the wave gradually declined. Measurement of float resistance 345 ohms. Based on the experience to judge, higher than normal. Later broken out of the car after the float, the measured resistance of 53 ohms when empty; 285 ohms when full. ThisContrary to General resistance coefficient of the vehicle, General car oil is smaller the higher the resistance, the location in the middle of the sensor is approximately 160 ohms. Try using analog resistive instead of the original car's oil level sensor and found petrol gauge pointer does not change as the change of resistance. Petrol table only after opening the keys shut once again the key is changing, estimates are computer signals to make anti-jammingFunction. Then, remove the sensor, sensor resistance measurement with multimeter and flipping by hand from the lowest to the highest position float, resistance is not continuous. Mutation occurs in one location, look, wear resistance does not
runescape items, but has a lot of dirt on the surface, sliding contact there was no bright metallic luster. Polished carefully clean this 2 components, and speedCompression spring elasticity. Resistance found a loose plug with leads, after cleaning and calibration of elastic, measurement of resistance with multimeter and remove float from the lowest to the highest positions, observation from 53 ohms continuous resistance to change to 285-ohm stable, without a break in the Middle, indicate the repair was successful. Loading test and found normal meter display oil warning lamp does not light up. YuIs the car to remind drivers of the fault may be caused because the fuel quality, adding fuel to pay attention to fuel grade. After 1 month of driving the vehicle, petrol table does not display exceptions, fault completely ruled out. (HC auto maintenance network)
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