Suzuki Workshop Service and Repair Manuals

Camshaft Position Sensor: Testing and Inspection
CMP Sensor On-Vehicle Inspection

CMP Sensor On-vehicle Inspection

Check that CMP sensor signal is output properly  See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Pinout Values
and Diagnostic Parameters.
Check the following points if any faulty conditions are found:

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Wire harness and connections

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CMP sensor:  See: CMP Sensor Inspection