P0346

DTC P0346 CAMSHAFT POSITION SENSOR "A" CIRCUIT RANGE/PERFORMANCE (BANK 2)

CIRCUIT DESCRIPTION

DTC Detection Condition:

The Variable Valve Timing (VVT) sensor consists of a magnet, iron core and pickup coil. The VVT signal plate has 3 teeth on its outer circumference and is installed on the camshaft timing pulley. When the camshafts rotates, changes occur on the camshaft protrusions and the pickup coil air gaps. These changes cause fluctuation in the magnetic field and generate voltage in the pickup coil.

Each sensor monitors its timing rotor, which is located on the camshaft. The ECM uses the sensor to detect the camshaft angle.The camshaft rotation synchronizes with the crankshaft rotation, and this sensor communicates the rotation of the camshaft timing rotor as a pulse signal to the ECM. Based on the signal, the ECM controls the camshaft timing.

HINT:
- DTC P0340 and P0345 indicate a malfunction related to the VVT sensor (+) circuit (wire harness from ECM to VVT sensor bank 1, and from ECM to VVT sensor bank 2).
- DTC P0341 and P0346 indicate a malfunction related to the VVT sensor (-) circuit (wire harness from ECM to VVT sensor bank 1, and from ECM to VVT sensor bank 2).




Reference: VVT sensors and crankshaft position sensor waveforms.

Using an oscilloscope, confirm the VVT sensor condition at the engine idling.Correct waveform is as shown in the illustration.




a. VVT sensor (Bank 1)
b. VVT sensor (Bank 2)
c. Crankshaft position sensor

MONITOR DESCRIPTION

Monitor Strategy:

Typical Enabling Conditions:

Typical Malfunction Thresholds:

Component Operating Range:

If there is no signal from the VVT sensor even though the engine is revolving, 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:

Step 1 - 2:

Step 3 - 4:

INSPECTION PROCEDURE

HINT:
- If DTC P0340 and P0341 are displayed, check the left bank VVT sensor.
- If DTC P0345 and P0346 are displayed, check the right bank VVT sensor.
- Read freeze frame data using the hand-held tester. 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.