Camshaft Position Sensor: Testing and Inspection

WIRING DIAGRAM





CIRCUIT DESCRIPTION
The CMP sensor located on the rearward of cylinder head consists of the signal generator (photo transistors) and signal rotor (slits plate).
The signal generator generates Reference signal and Position signal through two types of slits in the slit plate which turns together with the camshaft.

Reference signal
The CMP sensor generates 4 pulses of signals each of which has a different wave form while the camshaft makes one full rotation.
Based on these signals, ECM judges which cylinder piston is at the ignition BTDC 110°

Position signal
The CMP sensor generates 360 pulses of signals while the camshaft makes one full rotation (i.e., 1 pulse per 1° movement of the camshaft). Based on these signals, ECM judges the size of Reference signal, the engine speed and piston position.





DETECTING CONDITION AND TROUBLE AREA





DTC CONFIRMATION PROCEDURE
(1) Connect scan tool to DLC with ignition switch OFF.
(2) Turn ON ignition switch and clear DTC, pending DTC and freeze frame data by using scan tool.
(3) Crank engine for 5 seconds or more.
(4) Stop cranking and check DTC by using scan tool.





TROUBLESHOOTING