Camshaft & Crankshaft Position Sensors
Cam Position Sensors Operation for 1UZ-FE VVT-i Engines
Camshaft position sensor (G2 signal) consist of a signal plate and pickup coil.
The G2 signal plate has 1 tooth, on its outer circumference and is mounted on the left bank camshafts. When the camshafts rotate, the protrusion on the signal plate and the air gap on the pickup coil change, causing fluctuations in the magnetic field and generating an electromotive force in the pickup coil. The NE signal plate has 34 teeth and is mounted on the crankshaft. The NE signal sensor generates 34 signals for every engine revolution. The ECM detects the standard crankshaft angle based on the G2 signal and the actual crankshaft angle and the engine speed by the NE signals.
Cam Position Sensors Operation for 1UZ-FE Non VVT-i Engines
The camshaft position sensors report camshaft rotation to the ECU. By overlapping the signal from the engine speed signal (NE) with that of the camshaft (G1 and G2) sensors, very accurate recording of cylinder position is possible.
Mounted inside both distributor housings.
Each sensor is a simple magnetic pickup.
Each sensor reads a protrusion on the camshaft drive sprocket. As the protrusion passes over the sensor tip, the sensors magnetic field collapses and causes a voltage spike. The spike is read by the ECU.
NOTE: “Cold” and “Hot” in these sentences express the temperature of the coils themselves. “Cold” is from -10 °C (14 °F) to 50 °C (122 °F) and “Hot” is from 50 °C (122 °F) to 100 °C (212 °F) .
INSPECT CRANKSHAFT POSITION SENSOR
- Remove the sensor.
- Using an ohmmeter, measure the resistance between the terminals.
If the resistance is not as specified, replace the sensor.
- Reinstall the sensor.