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2008 - MX-5 - Engine

CAMSHAFT POSITION (CMP) SENSOR INSPECTION [LF]

NOTE:

Visual Inspection

1. Remove the battery cover.
2. Disconnect the negative battery cable. (SeeBATTERY REMOVAL/INSTALLATION [LF].)
3. Remove the CMP sensor. (See CAMSHAFT POSITION (CMP) SENSOR REMOVAL/INSTALLATION [LF].)
4. Verify that there are no metal shavings on the sensor.

Voltage inspection

1. Install all removed parts.
2. Idle the engine.

CAUTION:

3. Measure the output voltage using an oscilloscope.

Voltage

Terminal

Voltage (V)

Condition

C

B+

Under any condition

B

4.8 or more

High output*

0.8 or less

Low output*

A

0

Under any condition


*
Output voltage varies with camshaft rotation.

Circuit Open/Short Inspection

1. Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION [LF].)
2. Inspect the following wiring harnesses for an open or short circuit. (Continuity Inspection)
Open circuit
Short circuit


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