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Remove combination meter. Insert a small screwdriver into hole in rear portion of speed sensor. See Figure thru Figure. Using an ohmmeter, check continuity between terminals while slowly rotating sensor with screwdriver. See SPEED SENSOR CONTINUITY CHECK  table for terminal locations. While turning sensor, needle on ohmmeter should deflect twice per revolution on all models.

SPEED SENSOR CONTINUITY CHECK

Model Positive Terminal Negative Terminal
Pathfinder & Pickup
W/Voltmeter 27 28
W/O Voltmeter 25 24
Pulsar NX Series 3 4
Sentra
W/Tachometer 18 24
W/O Tachometer 21 20
Stanza 9 8
Fig 1: Rear of Combination Meter (Maxima)
G90H02757Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 2: Rear of Combination Meter (240SX)
G90J02758Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 3: Rear of Combination Meter (300ZX)
G90B02759Courtesy of NISSAN MOTOR CO., U.S.A.