Description

The Camshaft Position (CMP) sensor consists of a magnet and an iron core which is wrapped with copper wire, and is installed onto the cylinder head. When the camshaft rotates, each of 3 teeth on the camshaft passes through the CMP sensor. This activates the internal magnet in the sensor, generating a voltage in the copper wire. The camshaft rotation is synchronized with the crankshaft rotation. When the crankshaft turns twice the voltage is generated 3 times in the CMP sensor. The generated voltage in the sensor acts as a signal, allowing the ECM to locate the camshaft position. This signal is then used to control ignition timing, fuel injection timing, and the VVT system.

DTC No.

DTC Detection Conditions

Trouble Areas

• No Camshaft Position (CMP) sensor signal to ECM while cranking ( 2 trip detection logic)

Case 2

• No CMP sensor signal to ECM at engine speed of 600 rpm or more (1 trip detection logic)

• Open or short in CMP sensor circuit

• Jumped tooth of timing chain

• ECM

P0341

When crankshaft rotates twice, Camshaft Position (CMP) sensor signal input to ECM 12 times or more (1 trip detection logic)

• Open or short in CMP sensor circuit

• Jumped tooth of timing chain

• DTC P0340 indicates a malfunction relating to the CMP sensor (+) circuit (the wire harness between the ECM and CMP sensor, and the CMP sensor itself).

• DTC P0341 indicates a malfunction relating to the CMP sensor (-) circuit (the wire harness between the ECM and CMP sensor, and the CMP sensor itself).

Reference: Inspection using an oscilloscope

i i i i V-V

i i i i HHV-

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A063955E03

HINT:

• The correct waveform is as shown above.

• G2 stands for the CMP sensor signal, and NE+ stands for the Crankshaft Position (CKP) sensor signal.

Items

Contents

Terminals

CH1: G2 - NE-CH2: NE+ - NE-

Equipment Settings

5 V/Division, 20 ms/Division

Conditions

Cranking or idling

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