Sep 172019

Hyundai Accent

I recently replaced the crankshaft position sensor. The tach began working again, brakes stopped being super touchy, and the car would shift fine again, problem solved. However, just 2 weeks later same exact problem again. My question is, would there be a cause for this part to repeatedly fail and how to prevent it failing again?

There are a few things to look at. The sensor of course. Next look at the connection to the sensor. Then check the wiring harness and connection at the PCM.

Crankshaft Position Sensor Description

A Crankshaft Position Sensor (CKPS) is a magnetic type sensor that generates voltage using a sensor and a target wheel mounted on the crankshaft. There are 58 slots in the target wheel where one is longer than the others. When the slot in the wheel aligns with the sensor, the sensor voltage outputs low. When the metal (tooth) in the wheel aligns with the sensor, the sensor voltage outputs high. During one crankshaft rotation there are 58 rectangular signals and one longer signal. The PCM calculates engine RPM by using the sensor’s signal and controls the injection duration and the ignition timing. Using the signal differences caused by the longer slot, the PCM identifies which cylinder is at top dead center.

Crankshaft Position Sensor Location


How to test the crankshaft position sensor

Using an ohm meter check for the Resistance. You are looking for it to read between 774 – 946. If it is not, replacement will be needed.

Crankshaft Position Sensor Wiring Diagram


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