Crankshaft position sensor connector checking

Tiny
MIN MYAT THU
  • MEMBER
  • 2007 PEUGEOT 207
  • 160,000 MILES
Measuring 3pin of Crankshaft Position Sensor connector socket, 2 wire have 5v and 2v respectively.
Is it normal?
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Sunday, August 8th, 2021 AT 9:55 AM

1 Reply

Tiny
KASEKENNY
  • EXPERT
It sounds normal but unfortunately we don't have a manual on this vehicle as it is not offered here in the USA to be sure.

However, the way these work is the ECM supplies voltage to power the sensor which is a 5 volt reference circuit. Next it has what is called a low reference which goes from the sensor back to the ECM. This is basically the ground.

The last wire is called the signal wire. This is the circuit that tells the ECM the position of the crank by changing the voltage in what is called a square wave pattern.

So the 5 volt reference should have pretty close to 5 volts and the low reference should have close to 0 but be the difference between the supply and 5 volts. So if the 5 volt reference is 4.5 volts then the low reference will be .5 volts.

https://www.2carpros.com/articles/symptoms-of-a-bad-crankshaft-sensor

https://www.2carpros.com/articles/crankshaft-angle-sensor-replacement

It is hard to watch a crank sensor when it is turning with a meter because it moves pretty fast so it may only pick up 2 volts as the meter does not display the actual changing voltage fast enough.

Please let us know if you have other questions and we can go from there.

Thanks
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Monday, August 9th, 2021 AT 6:08 PM

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