P1340

DTC P1340 Camshaft Position Sensor "A" (Bank 1 Sensor 2)
DTC P1342 Camshaft Position Sensor "A" Low Input (MRE)
DTC P1343 Camshaft Position Sensor "A" High Input (MRE)

DESCRIPTION

DTC Detection Condition:

The camshaft position sensor system consists of a signal plate (installed on the camshaft timing gear RH) and Magnetic Resistance Element (MRE) type cam position sensor. The signal plate has 3 protrusions. When it rotates, the magnetic vector (direction of magnetic field) applied to the camshaft's MRE varies, which causes its resistance to vary. This varying resistance is converted to voltage, and then modified into a rectangular waveform with Hi (approximately 4 V) and Lo (approximately 1 V) outputs. As a result, the G2 signal is output to the ECM. The ECM uses the G2 signal to distinguish between the cylinders and detect the camshaft position.




Reference: Inspection using an oscilloscope.






HINT:
- The correct waveform is as shown.
- VV1+ and VV2+ stand for the VVT sensor (for intake side) signal, and NE+ stands for the CKP sensor signal.

MONITOR DESCRIPTION

Monitor Strategy:

Typical Enabling Conditions:

Typical Malfunction Thresholds:

Component Operating Range:

If there is no signal from the camshaft position sensor even though the engine is turning, or if the rotation of the camshaft and the crankshaft is not synchronized, the ECM interprets this as a malfunction of the sensor.

When the sensor output voltage remains less than 0.3 V, or more than 4.7 V for more than 5 seconds, the ECM sets a DTC.

Wiring Diagram:

Step 1-2:

Step 3-7:

Step 7(Continued)-8:

INSPECTION PROCEDURE

HINT: Read freeze frame data using the intelligent tester or Techstream. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich and other data from the time the malfunction occurred.