Suzuki Workshop Service and Repair Manuals

Crankshaft Position Sensor: Testing and Inspection
CKP Sensor On-Vehicle Inspection

CKP Sensor On-vehicle Inspection

Check that CKP sensor signal is output properly  See: Computers and Control Systems/Testing and Inspection/Pinout Values and Diagnostic Parameters.
If faulty condition is found, check the following points:

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Wire harness and connections

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CKP sensor:  See: CKP Sensor Inspection