Circuit Description

WARNING: This page is about a different car, the 2004 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.

The camshaft position sensor (G22+ signal) consists of a magnet, iron core and pickup coil.

The G22+ 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 changes, causing fluctuations in the magnetic field and generating an electromotive force in the pickup coil. The NE+ signal plate (crankshaft timing pulley) has 34 teeth and is installed to 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 G22+ and NE+ signals.

DTC DETECTION CONDITION

DTC No.	DTC Detection Condition	Trouble Area
P0340	No camshaft position sensor signal to ECM during cranking (2 trip detection logic) No camshaft position sensor signal to ECM with engine speed 600 rpm or more (1 trip detection logic)	Open or short in camshaft position sensor circuit Camshaft position sensor Camshaft timing pulley Timing chain has jumped a tooth ECM
P0341	While crankshaft rotates twice, camshaft position sensor signal is input to ECM 12 times or more (1 trip detection logic) Hint: Under normal condition, the camshaft position sensor is input into the ECM 3 times per 2 engine revolutions

Fig 1: Camshaft Position Sensor Waveform Graph

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Reference: Inspection using the oscilloscope.

HINT:

The correct waveform is as shown on the left.

ITEM DESCRIPTION

Item	Contents
Terminal	CH1:G22+-NE- CH2:NE+-NE-
Equipment Set	5V/DIV, 20ms/DIV
Condition	During cranking or idling