CRANKSHAFT POSITION (CKP) SENSOR INSPECTION [MZR 1.6]

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Visual Inspection

Caution
•  When replacing the CKP sensor, make sure there is no foreign matter on it such as metal shavings. If it is installed with foreign matter, the sensor output signal will malfunction resulting from fluctuation in magnetic flux and cause a deterioration in engine control.

1.  Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].)

2.  Lift up the vehicle.

3.  Perform the following procedure for easier access.

(1)  Remove the front under cover No.2. (See FRONT UNDER COVER No.2 REMOVAL/INSTALLATION.)
(2)  Remove the front splash shield (RH). (See SPLASH SHIELD REMOVAL/INSTALLATION.)

4.  Disconnect the CKP sensor connector.

5.  Remove the CKP sensor. (See CRANKSHAFT POSITION (CKP) SENSOR REMOVAL/INSTALLATION [MZR 1.6].)

6.  Verify that there are no metal shavings on the sensor.

•  If there is a malfunction, remove any metal shavings that are adhering.


Air Gap Inspection

1.  Verify that the CKP sensor is securely installed. (See CRANKSHAFT POSITION (CKP) SENSOR REMOVAL/INSTALLATION [MZR 1.6].)

2.  Using a thickness gauge, measure the air gap between the plate projections at the back of crankshaft pulley and the CKP sensor.

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•  If not within the specification, inspect the plate projections for cracks or bending.
―  If there is any malfunction, replace the crankshaft pulley. (See FRONT OIL SEAL REPLACEMENT [MZR 1.6].)
Air gap
0.5—1.5 mm {0.02—0.05 in}


Voltage Inspection

Caution
•  When replacing the CKP sensor, make sure there is no foreign matter on it such as metal shavings. If it is installed with foreign matter, the sensor output signal will malfunction resulting from fluctuation in magnetic flux and cause a deterioration in engine control.
•  If the wiring harnesses or waterproof connectors are damaged, water penetrating the connector will cause a sensor malfunction. To prevent this, be careful not to damage wiring harnesses or waterproof connectors.

1.  Idle the engine.

2.  Measure the CKP sensor output voltage using the oscilloscope.

•  If not as specified, replace the CKP sensor. (See CRANKSHAFT POSITION (CKP) SENSOR REMOVAL/INSTALLATION [MZR 1.6].)
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Terminal

Voltage (V)

Condition
A
B+
Under any condition
B
Above 4.8
High output*
Below 0.8
Low output*
C
Below 1.0
Under any condition

*  :Output voltage varies with crankshaft rotation.