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Crankshaft Sensor Code, Sensor replaced but no still doesn't start.
Good day, trying to solve a crank no start issue on my R56. The car suddenly stopped, was towed back and scanned, got the P0335 code which is a crankshaft sensor. Replaced it, still didn't start so got another, believing the first was just faulty, however car still won't start. RPMs go up by a little when cranking but just won't get spark at all. Anyone has an ideas on what could cause this. Code still appears even when cleared.
According to Mitchell1, your engine uses a three wire Hall effect sensor.
One wire is going to be a 5 VDC reference signal from the DME (engine computer). A second wire is going to be a ground wire; this wire should have less than 300 mv. The third wire is a square wave signal wire back to the PCM. The waveform on the signal wire should look like this, but you need a lab scope to see it.
A lot of the time when you get a crankshaft position sensor fault, it is the sensor, but that's not always the case. If the DME isn't sending the 5VDC reference signal to the sensor, the sensor wont' work. Likewise, if any of the wires to the sensor are cut, or shorted out. the sensor won't work properly.
Now, that leaves us with the reluctor wheel. If the wheel is damaged (unlikely, but possible), there's nothing for the sensor to pick up, or the signal will look wrong to the engine computer.
All of these situations will keep the car from starting.
Here is a lab scope wave form from my '09 Justa showing the crankshaft (blue) and intake and exhaust camshaft signals. You need to find out if your sensor is producing the signal as show below.
Its not my car with the issue... But thanks for taking the time to put up such a great post !!
Originally Posted by mkov608
According to Mitchell1, your engine uses a three wire Hall effect sensor.
One wire is going to be a 5 VDC reference signal from the DME (engine computer). A second wire is going to be a ground wire; this wire should have less than 300 mv. The third wire is a square wave signal wire back to the PCM. The waveform on the signal wire should look like this, but you need a lab scope to see it.
A lot of the time when you get a crankshaft position sensor fault, it is the sensor, but that's not always the case. If the DME isn't sending the 5VDC reference signal to the sensor, the sensor wont' work. Likewise, if any of the wires to the sensor are cut, or shorted out. the sensor won't work properly.
Now, that leaves us with the reluctor wheel. If the wheel is damaged (unlikely, but possible), there's nothing for the sensor to pick up, or the signal will look wrong to the engine computer.
All of these situations will keep the car from starting.
Here is a lab scope wave form from my '09 Justa showing the crankshaft (blue) and intake and exhaust camshaft signals. You need to find out if your sensor is producing the signal as show below.
