A car RuiHu 2007 annual chery, carrying SQR481 aeroengine, matching QR523 type manual gearbox, user reflect the vehicle in other garage to replace the timing tooth belt, after the engine has been lighted, warning light and acceleration engine speed cannot exceed 4000r/min.
    Pick up car after the determined, fault that such as user above. Maintenance personnel first connect the malfunction diagnosis machine of engine control system for testing, device display engine control units storage fault code "P0341 - camshaft position sensor signal is not correct". According to our experience, the car's maintenance in the car's engine control system control strategy, when the camshaft position sensor failure appear when a fault, launch opportunity to appear starting difficulties and engine with the highest speed super but 4000r/min fault symptoms, and engine control units will store P0341 fault code. By contrast, the camshaft position sensor failure found fault symptoms after simulation results with fault symptoms perfectly.
    After the author of fault code executed cleaning operation, but as long as move together engine, fault code will appear again, explain fault code for the current real fault. Cause this fault code appears the reason include: the gas distribution timing is not correct, CAM shaft position sensor line fault, CAM shaft position sensor fault, signal target wheel itself position incorrect and engine control unit interior fault.
    Because the car is in the replacement tooth belt after timing problems, the author doubt engine with gas timing institutions assembly is not correct. Then the author first according to the standard operation norm use a special tool to proofread the gas distribution timing, but the engine warning lights still couldn't extinguished. After consulting relevant circuit diagram knowable, camshaft position sensor three thread respectively, the 12V ground power and line. By using a multimeter measuring, sensor power supply, grounding and signal line all normal, did not appear breakers, short circuit and imaginary connect phenomenon. According to the principle of multiplying by Jane, the author first try to change the camshaft position sensor, but had no effect. In view of engine control unit, the possibility of damage was relatively small, it did not carry on the replacement. Will timing tool assembly
    In the replacement of inlet camshaft assembly and using malfunction diagnosis machine eliminate malfunction code, commissioning engine speed can reach about 6000r/min, fault eliminate.
    Summary: the car camshaft position sensor target wheel and camshaft inflammatory, coordination, general earnings will not happen position change. The camshaft position sensor target wheel position is changed, is most likely to school is always with repair plant a screwdriver to proofread timing target round orchard, cause. The vehicle exhaust camshaft front-end, in a 24mm open-end wrench rotating shaft neck, in six-party defuse timing tooth belt after, if required, turn the camshaft, only by this way realization. Other operations may produce negative consequences, hope maintenance colleagues attention.