NG -- SECURELY REINSTALL CRANKSHAFT POSITION SENSOR See: Powertrain Management/Computers and Control
Systems/Crankshaft Position Sensor/Service and Repair/Removal
OK -- Continue to next step.
5. CHECK CRANKSHAFT (TEETH OF CRANK ANGLE SENSOR PLATE)
(a) Check the teeth of the crank angle sensor plate.
OK:
Crank angle sensor plate does not have any cracks or deformation.
NG -- REPLACE CRANKSHAFT See: Engine, Cooling and Exhaust/Engine/Cylinder Block Assembly/Service and
Repair/Overhaul/Disassembly
OK -- REPLACE ECM See: Powertrain Management/Computers and Control Systems/Engine Control Module/Service and
Repair/Removal
Up to 08/2009
2GR-FE ENGINE CONTROL: SFI SYSTEM: P0340,P0342,P0343,P0345,P0347,P0348: Camshaft Position Sensor Circuit Malfunction
DESCRIPTION
The intake camshaft's VVT sensor (VV1, VV2 signal) consists of a magnet and MRE (Magneto Resistive Element).
The VVT camshaft drive gear has a sensor plate with 3 teeth on its outer circumference. When the gear rotates, changes occur in the air gaps
between the sensor plate and MRE, which affects the magnetic field. As a result, the resistance of the MRE material fluctuates. The VVT sensor
converts the gear rotation data to pulse signals, uses the pulse signals to determine the camshaft angle, and sends it to the ECM.
The crank angle sensor plate has 34 teeth. The pickup coil generates 34 signals for each engine rotation. Based on combination of the VVT signals
and NE signal, the ECM detects the crankshaft angle. Then the ECM uses this data to control fuel injection time and injection timing. Also, based on
the NE signal, the ECM detects the engine speed.
- Reference: Inspection using an oscilloscope
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