A33 demeanor sometimes difficult to start tempering starter interference

Troubleshooting: First fight starts authentication failure phenomenon, found that playing three or four times to start the engine, and sometimes tempered, sometimes it seems premature ignition, if the same disorder after high-voltage ignition plug wrong. But this engine is an independent ignition system, check the ignition coil plugs did not plug the wrong, read the fault code display system properly. Can have an renault clip impact on the ignition timing is mainly crankshaft position sensor, which is equipped with two engine crankshaft position sensor, a pulley mounted on the back, generating a signal point 120 ° TDC, a housing mounted on the flywheel, produces 360 ° signal. First with 120 ° signal oscilloscope test mentioned earlier, the measured waveform is shown in Figure 17, the arrow is part of the waveform at start, there has been a lot of clutter on top of the back part is no clutter waveform after the start, obviously when you start the 120 ° signal is disturbed. 120 ° sensor is an elm327 bluetooth electromagnetic signal, two lines into a computer, a grounding in the engine block. Start the machine at the time of launching the current large, if the grounding line contact, it might generate noise thereby affecting 120 ° signal. Then the oscilloscope probe to the engine block, the measured waveform shown clutter rate reached more than 18 1V, for grounding wire into the grinding process, and added a grounding line, test the fault persists. Re-adjust their thinking again 17 for analysis. The main source of interference on the car is a generator, ignition coil and car key programmer starter. Clutter is generated at startup, start the clutter disappear, indicating that the ignition coil and the generator is not the source of interference, the problem should be out on the starter. Remove the starter motor brush and commutator decomposition found serious erosion, should be a source of interference brush and commutator spark, after replacing starter troubleshooting.