986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post - What does the Crankshaft Position Sensor do?

JFP in PA · 02-22-2016, 02:04 PM

The CPS provides the DME with rotational position and rate data for the crankshaft. The DME uses this data for determining how to control fuel (no rotation, fuel pump does not run), spark timing, etc. So the CPS does not control anything, the DME does, but does so in relation to other data (MAF, throttle position, O2 sensors, coolant temp, etc.) to control and optimize the performance of the engine according to the DME's programing algorithm's.

02-22-2016, 02:04 PM	#2
JFP in PA Registered User Join Date: Feb 2005 Location: It's a kind of magic..... Posts: 6,277	The CPS provides the DME with rotational position and rate data for the crankshaft. The DME uses this data for determining how to control fuel (no rotation, fuel pump does not run), spark timing, etc. So the CPS does not control anything, the DME does, but does so in relation to other data (MAF, throttle position, O2 sensors, coolant temp, etc.) to control and optimize the performance of the engine according to the DME's programing algorithm's. __________________ “Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein