What happens when a crank sensor goes bad?
Intermittent stalling Another symptom commonly associated with a problematic crankshaft position sensor is intermittent stalling. If the crankshaft position sensor or its wiring have any issues, it can cause the crankshaft signal to be cut off while the engine is running, which can cause the engine to stall.
What does the crank position sensor do?
The Crankshaft Position Sensor is attached to the engine block facing the timing rotor on the engine crankshaft. The sensor detects signals used by the engine ECU to calculate the crankshaft position, and the engine rotational speed. There are 2 types of the crankshaft position sensors.
Can you fix a crank sensor?
Place a door-panel remover on the side of the crankshaft sensor. Pry the sensor loose from the engine block and wiggle it around until it can be removed. If the crankshaft sensor is corroded, you will have to replace it with a new one.
What happens if the sensor on the crankshaft is missing?
If the signal from the sensor is missing, there will be no spark and fuel injectors won’t operate. The two most common types are the magnetic sensors with a pick-up coil that produce A/C voltage and the Hall-effect sensors that produce a digital square wave signal as in the photo above. Modern cars use the Hall-effect sensors.
What causes intermittent stalling on the crankshaft sensor?
In some cars (e.g. Mercedes-Benz, Nissan, Chevy, Hyundai, Kia) this code is often caused by a failed sensor itself, although there could be other reasons, such as wiring or connector issues, damaged reluctor ring, etc. In some cars, the intermittent stalling can also be caused by a problem with the crankshaft position sensor wiring.
What does a 5 volt reference signal mean?
Photo 2: The ECT sensor consists of a 5-volt reference, a variable thermistor, and a signal return wire to the ECM. As you might suspect, this was a no-code problem that had bewildered two previous shops. If I recall, one shop replaced the idle air control (IAC) and another replaced the oxygen sensor because the exhaust “smelled rich.”
What is the reference signal on a 1998 Jeep Sport?
Photo 1: The intermittent stalling condition on this 1998 Jeep Cherokee Sport had fooled two previous shops. Basic ECT sensor diagnostics include an open circuit displaying -40° F on the ECT data stream and between 250° and 300° F if the reference and signal return wires are shorted together.
https://www.youtube.com/watch?v=ICjgu71FYjc