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2008 - MX-5 - Engine

CRANKSHAFT POSITION (CKP) SENSOR INSPECTION [LF]

NOTE:

Air Gap Inspection

1. Verify that the CKP sensor is securely installed.
2. Using a thickness gauge, measure the air gap between the plate projections at the back of crankshaft pulley and the CKP sensor.

Visual inspection

1. Remove the battery cover.
2. Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [LF].)
3. Remove the CKP sensor. (See CRANKSHAFT POSITION (CKP) 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 crankshaft 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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