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Home >> Infiniti >> 1990 >> Q45 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Testing >> Optical Ignition System Checks (M30) >> Crank Angle Sensor

Crank Angle Sensor

  1. Remove crank angle sensor from engine. Do not disconnect crank angle sensor harness connector. Turn ignition switch 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. 3 (120-degree signal), voltage should fluctuate between 0-5 volts. Move voltmeter positive lead to terminal No. 4 (1-degree signal), voltage should also fluctuate between 0-5 volts. See Fig 1 .
Fig 1: Checking M30 Crank Angle Sensor Circuit
G90I18752Courtesy of NISSAN MOTOR CORP.
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