P0340

DTC P0340 Camshaft Position Sensor "A" Circuit (Bank 1 or Single Sensor)

CIRCUIT DESCRIPTION

DTC Detecting Condition:

The camshaft position sensor (G2 signal) consists of a magnet iron core and pickup coil.

The G signal plate has 3 teeth on its outer circumference and is installed on the camshaft timing pulley. When the camshafts rotate, protrusion on the signal plate and air gap on the pickup coil change, causing fluctuations in the magnetic field and generating a voltage in the pickup coil.

The NE signal plate has 34 teeth and is mounted on the crankshaft. The NE signal sensor generates 34 signals at every engine revolution. The ECM detects the crankshaft angle and the engine revolution based on the NE+ signals, and the cylinder and the angle of the VVT based on the combination of the G2 and NE signals.




Reference: INSPECTION USING OSCILLOSCOPE
During cranking or idling, check the waveforms between terminals G2 and NE-, and NE and NE- of the ECM connector.

HINT: The correct waveforms are as shown in the illustration.

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.

Wiring Diagram:

INSPECTION PROCEDURE

Step 1 - 3:

Step 4:

HINT: Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, 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.