Fuel System > Engine Control System > Camshaft Position Sensor (CMPS)

INSPECTION

FUNCTION AND OPERATION PRINCIPLE

Camshaft Position Sensor (CMPS) is a hall sensor and detects the camshaft position by using a hall element. It is related with Crankshaft Position Sensor (CKPS) and detects the piston position of each cylinder which the CKPS can't detect. The two CMPS are installed on engine head cover of bank 1 and 2 and uses a target wheel installed on the camshaft. This sensor has a hall-effect IC which output voltage changes when magnetic field is made on the IC with current flow. So the sequential injection of the 6 cylinders is impossible without CMPS signal.

SPECIFICATION

Item	Specification
Output Voltage (V)	High : 5.0V
Output Voltage (V)	Low : 0 ~ 0.7V
Air Gap (mm)	0.5 ~ 1.5

WAVEFORM

This example shows a typical Crankshaft Position Sensor (CKPS) and Camshaft Position Sensor (CMPS) waveform at idle. If the 17th signal of the CKPS after missing tooth is aligned with the high signal of the CMPS at idle, PCM recognizes that Synchronization between CKPS and CMPS is completed.

SCHEMATIC DIAGRAM

COMPONENT INSPECTION

Check signal waveform of CMPS and CKPS using a scantool.

Specification: Refer to "WAVE FORM"