CRANKSHAFT POSITION (CKP) SENSOR INSPECTION [WL-3]
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Note
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• Before performing the following inspection, make sure to follow the procedure as indicated in the troubleshooting flowchart. (See
HOW TO USE THIS MANUAL.)
Visual Inspection
1. Remove the CKP sensor. (See CRANKSHAFT POSITION (CKP) SENSOR REMOVAL/INSTALLATION [WL-3].)
2. Verify that there are no metal shavings on the sensor.
3. Install the CKP sensor. (See CRANKSHAFT POSITION (CKP) SENSOR REMOVAL/INSTALLATION [WL-3].)
Voltage Inspection
1. Idle the engine.
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Caution
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• 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 a oscilloscope.
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• If as specified, carry out the “Circuit Open/Short Inspection”.
CMP sensor voltage
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Terminal
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Voltage (V)
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Condition
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A
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B+
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Under any condition
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B
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4.8 or more
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High output*
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0.8 or less
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Low output*
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C
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0
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Under any condition
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* :Output voltage varies with camshaft rotation.
Circuit Open/Short Inspection
1. Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION [WL-3].)
2. Disconnect the CKP connector.
3. Inspect the following wiring harness for open or short circuit (continuity check).
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• If there is an open or short circuit, repair or replace wiring harnesses.
Open circuit
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• Power circuit (CKP sensor connector terminal A and main relay connector terminal D)
• Signal circuit (CKP sensor connector terminal B and PCM connector terminal 1H)
• Ground circuit (CKP sensor connector terminal C and PCM connector terminal 1B)
Short circuit
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• CKP sensor connector terminal A and main relay connector terminal D short to ground
• CKP sensor connector terminal B and PCM connector terminal 1H short to power supply
• CKP sensor connector terminal B and PCM connector terminal 1H short to ground
• CKP sensor connector terminal C and PCM connector terminal 1B short to power supply
