crankshaft sensor v6 - Alfa Romeo Forum
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crankshaft sensor v6

So I appear to have fallen to p0335 syndrome.
Question, why does it not appear as a fault code stored on ecu straight away? It seems to only appear after several failed attempts to restart. Is this normal.? Also if I clear said fault when ecu detects it will car start without having to wait to cool down?
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If the TDC sensor is knackered then the car won't start, regardless of what the ECU says.

The error codes in the ECU don't stop the ECU working - they just record the various messages it gets back from the sensors, so that problems can be diagnosed.

Similarly the TDC sensor might be able to reply to the ECU but still not actually work, so you may not get an error message logged.

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The ecu checks various parameters on sensors such as voltage, current or impedance. That is all the sensor can send. When everything is ok it will start the engine with no problems but once a sensor falters it will remember that the sensor is out of range and not start for safety reasons until the faulty part is replaced and the code cleared. You can reset as the sensor only malfunctions when hot in some cases but that does not fix the problem. It just masks it until the sensor acts up again. Replace the faulty sensor and reset and all should be good as new. Sometimes the car will start when a sensor fails for example when you push it to start, and it will run in "closed loop" meaning it will not look at sensor data but rely on calculated data to determine fueling and spark advance.

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