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Home >> Infiniti >> 1992 >> Q45 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Testing >> Ignition Checks >> Optical Ignition System Checks (G20 & M30) >> Crank Angle Sensor
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Crank Angle Sensor

  1. Remove crank angle sensor from engine. DO NOT disconnect crank angle sensor harness connector. Turn ignition on (engine off).
  2. Connect negative voltmeter lead to ground. Rotate crank angle sensor shaft slowly by hand. Connect positive voltmeter lead to crank angle sensor connector terminal No. 1 (180-degree signal) for G20 or No. 3 (120-degree signal) for M30. See Fig 1 . Voltage should fluctuate between 0 and 5 volts. Move voltmeter positive lead to terminal No. 2 for G20 or No. 4 for M30 (one-degree signal). Voltage should again fluctuate between 0 and 5 volts.
Fig 1: Checking Crank Angle Sensor Ckt. (M30 Shown; G20 Is Similar)
G90I18752Courtesy of NISSAN MOTOR CO., U.S.A.