The Crankshaft Position Sensor is located on the transaxle housing, facing the gear teeth of the flywheel/flexplate. It detects the fluctuation of the engine revolution. The sensor consists of a permanent magnet, core and coil.
When the engine is running, the high and low parts of the teeth cause the gap with the sensor to change. This changing gap causes the magnetic field near the sensor to change. Due to the changing magnetic field, the voltage from the sensor changes.
The ECM receives this varying voltage signal and detects the fluctuation of the engine revolution.
See Figures 1 and 2
- Remove the sensor from the engine.
- Inspect the sensor tip. If damage to the tip is evident, replace the sensor.
- Plug in the sensor, but do not install it .
- Backprobe terminals 2 and 3 with a voltmeter. Using a screwdriver, touch it against the sensor core.
The voltmeter should read approximately 5 volts.
- Slowly pull the screwdriver away; the meter should remain at 5 volts.
- Touch the sensor core with the screwdriver; then quickly draw it away. The voltage should drop to approximately 0 volts.
- If the sensor does not respond accordingly, the sensor may be faulty.
See Figures 3 and 4