CRANKSHAFT POSITION (CKP) SENSOR INSPECTION[L3 Turbo]

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Note
•  Before performing the following inspection, make sure to follow the procedure as indicated in the troubleshooting flowchart. (See HOW TO USE THIS MANUAL.)

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.

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•  If not within the specification, inspect the plate projections for cracks or bending.
―  If there is any malfunction, replace the plate.
―  If the monitor item condition/specification (reference) is not within the specification, even though there is no malfunction, carry out the “Circuit Open/Short Inspection”.
Air gap
0.5—1.5 mm {0.02—0.05 in}


Visual Inspection

1.  Disconnect the negative battery cable.

2.  Remove the CKP sensor. (See CRANKSHAFT POSITION (CKP) SENSOR REMOVAL/INSTALLATION[L3 Turbo].)

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

•  If the monitor item condition/specification (reference) is without the specification even though there is no malfunction, carry out the “Circuit Open/Short Inspection”.


Voltage Inspection

1.  Idle the engine.

Caution
•  Water penetrating the connector will cause sensor malfunction. To prevent this, be careful not to damage the wiring harnesses or the waterproof connector so as to cause water penetration.

2.  Measure the output voltage using an oscilloscope.

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•  If not within the specification, replace the CKP sensor.
•  If the monitor item condition/specification (reference) is without the specification, even though the voltage is within the specification, carry out the “Circuit Open/Short Inspection”.

Voltage

Terminal

Voltage (V)

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

*  :Output voltage varies with crankshaft rotation.


Circuit Open/Short Inspection

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1.  Inspect the following wiring harnesses for an open or short circuit. (Continuity check)


Open circuit

•  If there is no continuity, the circuit is open. Repair or replace the wiring harness.
―  CKP sensor terminal A and PCM terminal 2P
―  CKP sensor terminal B and PCM terminal 2W
―  CKP sensor terminal C and main relay terminal A


Short circuit

•  If there is continuity, the circuit is shorted. Repair or replace the wiring harness.
―  CKP sensor terminal A and power supply
―  CKP sensor terminal B and power supply
―  CKP sensor terminal B and body ground
―  CKP sensor terminal C and body ground