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Home >> Infiniti >> 1993 >> Q45 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Testing >> Ignition Checks >> Optical Ignition System Checks (G20) >> Crankshaft Position Sensor
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Crankshaft Position Sensor

  1. Remove distributor (with internal crankshaft position sensor) from engine. DO NOT disconnect crankshaft position sensor harness connector. Turn ignition on.
  2. Connect negative lead of an analog voltmeter to ground. Rotate crank angle sensor shaft slowly by hand. Connect positive voltmeter lead to crankshaft position sensor connector terminal "a" (180-degree signal). See Fig 1 . Voltage should fluctuate between 0 and 5 volts. Move voltmeter positive lead to terminal "d" (one-degree signal). Voltage should again fluctuate between 0 and 5 volts.
Fig 1: Checking Crankshaft Position Sensor Circuit (G20)
G93I78467Courtesy of NISSAN MOTOR CO., U.S.A.
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