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Thursday, March 28, 2019

Nissan Skyline Crank Angle Sensors : CAS


R34 CAS on the left, R32/R33 on the right

Nissan CAS or crank angle sensor is a crankshaft position sensor driven from the exhaust cam. The CAS sometimes accidentally called a cam angle sensor, has an optical wheel inside that is driven at 1/2 crank speed.  It has two sets of slots inside. One set is 360 one for each degree. The other set of slots is 6 or one for every 120 degrees of crank rotation. You will often see the signals labeled as the 1 and 120 signals.   The CAS allows you to adjust base ignition timing on an RB engine.    There are several different part's and part numbers for them.  There are Mitsubishi and Hitachi sensors.  There even a couple of shapes of the R32/R33 sensor.  The late R32, and early R33 sensors had a slightly different shape than the early R32, and R33 later sensors that were all the same.

Crank Angle Sensor Part Numbers

23731-02U11



R32 GT-R with timing anti tamper tape applied

Notice the drive on the R34 CAS on the left, and the R32/R33 on the left



Other options



Crank angle sensor cross reference



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