If the vehicle intermittently stalls and after stalling you have no RPM signal and you have verified the wiring to the CKP sensor is good, then try replacing the sensor. Note: some reluctor rings are located in the bell housing of the transmission or behind the front engine cover and cannot be easily accessed. It should be stationary on the crankshaft. Make sure the reluctor ring isn’t dislodged. If it checks out okay, check the reluctor ring for damage, broken teeth, or debris lodged in the ring. Obtain a resistance spec for the Crank sensor. Check for loose connection or broken lock at the sensor connector. Make sure the wiring isn’t mis-routed near high voltage spark plug wires. Visually check the CKP harness for damage or cracking in the wiring insulation. Using a scope is best, but since most DIYers don’t have access to one you may be able to use a code reader or the tachometer to check for RPM signal. If there is no RPM reading, check for a signal coming out of the crank sensor. When engine stalls or if the engine will not start and continue to run, then crank engine while observing RPM reading. If the PCM senses a loss of CKP sensor signal (RPM signal) even momentarily, P0336 Audi may set.Ĭrankshaft sensor problems are at times intermittent and the vehicle may start and run for some time until problem occurs. In conjunction with the Camshaft position sensor (CMP) the PCM can determine timing of spark and fuel injection. The PCM uses this sensor to also determine cylinder misfires by measuring the reluctor teeth locations in the CKP sensor signal. The crankshaft reluctor has a specific number of teeth and the PCM can determine the position of the crankshaft using only this sensor’s signature pattern. I will focus on the former, since they are simpler design and more common. They too have a reluctor wheel with vanes and “windows” that change the voltage signal to the PCM, providing a RPM signal. These are three wire sensors, provided with voltage, ground, and signal. Some crank sensors are hall-effect sensors instead of permanent magnent sensors. The PCM (powertrain control module) uses this A/C signal to interpret engine RPM. As the reluctor wheel passes in front of the crank sensor, an A/C signal is produced that varies according to engine speed. The CKP sensor consists of (usually) a permanent magnent sensor that is mounted in front of a reluctor (toothed) wheel mounted to the crankshaft.
The crankshaft position sensor (CKP) is usually a two wire sensor: a signal and a ground.