Waveforms

Hall effect and MR (Magneto-Resistive) sensors

Application:

  • crankshaft position sensor;
  • camshaft position sensor;
  • transmission speed sensor;
  • vehicle speed sensor;
  • wheel speed sensor…
Typical waveform from a Hall effect rotational speed sensor
Typical waveform from a Hall effect rotational speed sensor

Typical waveform from a Hall effect rotational speed sensor

Signal from a Hall effect crankshaft position sensor on a VW Caddy 1.9SDI 2002.

Signal from a Hall effect crankshaft position sensor on a VW Caddy 1.9SDI 2002.

Output voltage waveform from the camshaft position sensor on a Nissan X-Trail 2.0 2003

Output voltage waveform from the camshaft position sensor on a Nissan X-Trail 2.0 2003

Output voltage waveforms from the crankshaft and camshaft position sensors on a Mitsubishi Pajero IV.

Output voltage waveforms from the crankshaft and camshaft position sensors on a Mitsubishi Pajero IV.
1 – signal from the camshaft sensor;
2 – signal from the crankshaft sensor.

Output voltage waveforms from a malfunctioning Hall effect crankshaft position sensor

Output voltage waveforms from a malfunctioning Hall effect crankshaft position sensor.
1 – signal from the camshaft sensor;
2 – signal from the crankshaft sensor.

Output voltage waveform from a malfunctioning Hall effect camshaft position sensor

Output voltage waveform from a malfunctioning Hall effect camshaft position sensor. The low or “on” voltage is too high at 4.3 V. The low voltage should be 0…0.2 V.

Signal from the crankshaft position sensor, the power supply circuit has an intermittent connection

Signal from the crankshaft position sensor, the power supply circuit has an intermittent connection

Signal from a properly functioning crankshaft position sensor, but the reluctor or interrupter teeth are physically damaged

Signal from a properly functioning crankshaft position sensor, but the reluctor or interrupter teeth are physically damaged

Signal from a malfunctioning camshaft position sensor

Signal from a malfunctioning camshaft position sensor.
1 – signal from the camshaft sensor 1;
2 – signal from the camshaft sensor 2.

Output voltage waveform from a malfunctioning Hall effect crankshaft position sensor

Output voltage waveform from a malfunctioning Hall effect crankshaft position sensor

Output voltage waveforms from a malfunctioning Hall effect sensor

Output voltage waveforms from a malfunctioning Hall effect sensor.
1 – signal from a Hall sensor;
2 – synchronization signal with the ignition spark in the cylinder 1.

Output voltage waveform from a malfunctioning crankshaft position sensor

Output voltage waveform from a malfunctioning crankshaft position sensor

Output voltage waveform from an MR wheel speed sensor

Output voltage waveform from an MR wheel speed sensor. The sensor itself is working properly, but the magnet in the wheel bearing assembly is cracked or broken. Note that these sensors are current mode versus voltage mode sensors. They output a varying current, Usually 7 and 14 mA.