P0340

Wiring Diagram:

SYSTEM DESCRIPTION
The CMP sensor located on the transmission side 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 while has a different wave form length while the camshaft makes one full rotation.

Based on these signals, ECM judges which cylinder piston is in the compression stroke.

Position signal
The CMP sensor generates 360 pulses of signals while the camshaft makes one full rotation (i.e., 1 pulse per 10 movement of the camshaft).
Based on these signals, ECM judges the waveform length of Reference signal, the engine speed and piston position.

Detecting Condition / Trouble Area:

DTC CONFIRMATION PROCEDURE

NOTE:
Check to make sure that the following conditions are satisfied when using this DTC CONFIRMATION PROCEDURE.
- Intake air temp.: -14 °C, 6.8 °F or higher
- Altitude (barometric pressure): 2400 m, 8000 ft or less (560 mm Hg, 75 kPa or more)

1. With ignition switch OFF, connect scan tool.
2. Turn ON ignition switch and clear DTC using scan tool.
3. Crank engine for 5 sec. or more.
4. Check DTC and pending DTC.

Troubleshooting (Steps 1 - 6):

REFERENCE




Connect oscilloscope between C20-10 (Reference signal) or C20-22 (Position signal) and E92-35 and check CMP sensor signals.