Ford 6.4L Power Stroke, Руководство пользователя

Страница: 55 / 103

54
ElEctrical componEnts
107
CKP (Crankshaft Position)
• The crankshaft position signal source is a magnetic pickup
sensor mounted in the right front side of the engine block.
• The sensor reacts to a trigger wheel positioned on
the crankshaft. The trigger wheel is a 60 minus
2 tooth steel disk with 58 evenly spaced teeth
and a slot that’s width is equivalent to removing
2 teeth (minus 2 slot) that is the SYNC gap.
• The sensor produces sine waves (converted to
square waves via the ECM) for each tooth edge that
breaks the magnetic field created by the permanent
magnet that is in the end of the sensor.
• Crankshaft speed is derived from the
frequency of the CKP sensor signal.
• Crankshaft position can be determined by
the syncronization of the CMP peg signal
to the CKP minus 2 slot signal.
• Diagnostic information on the CKP input signal is
obtained by performing accuracy checks on frequency.
• The ECM needs both the CKP and CMP signal to calculate
engine position. The CKP creates a signal that relates to
crankshaft speed and position relative to TDC (Top Dead
Center). The CMP creates a signal relative to which stroke
the piston is currently on (compression or exhaust).