P0342

DTC P0342 CAMSHAFT POSITION SENSOR "A" CIRCUIT LOW INPUT (BANK 1 OR SINGLE SENSOR)

CIRCUIT DESCRIPTION

DTC Detection Conditions:

The variable valve timing (VVT) sensor (VV signal) consists of a magnet, iron core and pickup coil.

The VV signal plate has 3 teeth on its outer circumference and is installed on the camshaft timing pulley.

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 a voltage in the pickup coil.

This sensor monitors a timing rotor located on the camshaft and is used to detect a camshaft angle by the ECM. 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 fuel injection time and ignition timing.







Reference: Inspection using the oscilloscope.

HINT:
- The correct waveform is shown.
- VV1+ and VV2+ stands for the VVT sensor signal, and NE+ stands for the CKP sensor signal.

MONITOR DESCRIPTION

Monitor Strategy:

Typical Enabling Conditions:

Typical Malfunction Thresholds:

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

Wiring Diagram:

Step 1 - 2:

Step 3 - 5:

INSPECTION PROCEDURE

HINT: 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.