Performance check

Remove metal particles on end face of primary pulley speed sensor, if any.
Arrange 12 V battery (1) and connect its positive terminal to "Vin" terminal (2) and negative terminal to "Ground" terminal (3) of sensor. Then using ohmmeter, measure resistance between "Vout" terminal (4) of sensor and negative terminal of battery by passing magnetic substance (iron) (5) while keeping approximately 1 mm (0.03 in.) gap with respect to end face of pulley speed sensor.
If resistance does not vary as specified below, replace pulley speed sensor.

Primary pulley speed sensor and secondary pulley speed sensor resistance

Resistance varies from less than 220 Ω (ON) to infinity (OFF) or from infinity (OFF) to less than 220 Ω (ON)

Fig 1: Checking Primary Pulley Speed Sensor
Courtesy of SUZUKI OF AMERICA CORP.

Fig 2: Checking Secondary Pulley Speed Sensor
Courtesy of SUZUKI OF AMERICA CORP.