![]() This was first used on the early GM 3.8L V6 Buick Sequential Fuel Injection (SFI) engines (and turbos) with distributorless Computer Controlled Coil Ignition (C3I). One is a Hall effect crank position sensor that reads a notched metal "interrupter" ring on the back of the harmonic balancer. There are a variety of different types of crankshaft position sensors. If the computer senses enough of these, it will illuminate or flash the Check Engine or Service Engine Soon light to signal the driver he has a problem. On 1996 vehicles with Onboard Diagnostics II (OBD II), the crankshaft position sensor is also used to detect variations in crank speed caused by ignition misfire. It also does away timing adjustments (or misadjustments as the case may be). This eliminates ignition timing variations that can result from wear and backlash in the timing chain and distributor gear. ![]() These sensors serve essentially the same purpose as the ignition pickup and trigger wheel in an electronic distributor, the only difference being that the basic timing signal is read off the crankshaft or harmonic balancer instead of the distributor shaft. Basics of Crankshaft & Camshaft Position SensorsĪuto Repair Library, Auto Parts, Accessories, Tools, Manuals & Books, Car BLOG, Links, Indexīasics of Crankshaft & Camshaft Position Sensors by Larry Carley copyright 2019 ĭistributorless ignition systems require a crankshaft position sensor (CKP), and sometimes also a camshaft position sensor (CMP). ![]()
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