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Home >> Infiniti >> 1993 >> Q45 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Testing >> Ignition Checks >> DISTRIBUTORLESS Ignition System Checks (J30 & Q45) >> Crankshaft Position Sensor
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Crankshaft Position Sensor

  1. Remove crankshaft position sensor from engine. DO NOT disconnect crankshaft position sensor harness connector. Turn ignition on (engine off).
  2. Connect negative lead of an analog voltmeter to ground. Rotate crankshaft position sensor shaft slowly by hand. Connect positive voltmeter lead to crankshaft position sensor connector terminal No. 1 (one-degree signal, J30; 90-degree signal, Q45). Voltage should fluctuate between zero and 5 volts. Move voltmeter positive lead to terminal No. 2 (120-degree signal, J30; one-degree signal, Q45). Voltage should again fluctuate between zero and 5 volts. See Fig 1 .
Fig 1: Checking Crankshaft Pos. Sensor & Sub-Crankshaft Pos. Sensor (Q45 Shown; J30 Is Similar)
G93D78462Courtesy of NISSAN MOTOR CO., U.S.A.
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