Mitsubishi Eclipse II technical information manual page 41

text version of content this owner's manual page from owners manual to the vehicle Mitsubishi Eclipse, year of production 1995 - 1999:

l-20 ENGINE - Control System The notches generate pulses from high to low inlates crankshaft angle (position). In each group of the crankshaft position sensor output voltage. Whentiming reference notches, the first notch represents a metal portion of the counterweight aligns with69 degrees before top dead center (BTDC). The second notch represents 49 degrees BTDC. The the crankshaft position sensor, the sensor output voltage goes low (less than 0.3 volts). When a notchthird notch represents 29 degrees. The last notch aligns with the sensor, voltage spikes high (5.0 volts).in each set represents 9 degrees before top dead As a group of notches pass under the sensor, thecenter (TDC). output voltage switches from low (metal) to high (notch) then back to low. The timing reference notches are machined to a uniform width representing 13.6 degrees of crank- If available, an oscilloscope can display the squareshaft rotation. From the voltage pulse width the PCM wave patterns of each voltage pulse. From the width tells the difference between the timing reference of the output voltage pulses, the PCM calculates notches and the 60 degree signature notch. The engine speed. The width of the pulses represent 60 degree signature notch produces a longer pulse the amount of time the output voltage stays high width than the smaller timing reference notches. before switching back to low. The period of time If the camshaft position sensor input switches from the sensor output voltage stays high before switch- high to low when the 60 degree signature notch ing back to low is referred to as pulse width. The passes under the crankshaft position sensor, the faster the engine is operating, the smaller the pulse width on the oscilloscope. PCM knows cylinder number one is the next cylinder at TDC. By counting the pulses and referencing the pulse from the 60 degree signature notch, the PMC calcu- 210” 150” piiq 210” I I 1 TDC TDC TDC TDC 69” 49”29” 9”l 3 Crank + + I signal Crank 360 400440480 520 560 600 640 600 720 angle 0 0 320 0 40 80 120160200240280 200240280 320 0 4080120160 AFU0072

owners manual Mitsubishi Eclipse

owners manual Mitsubishi Eclipse - year of production: 1995, 1996, 1997, 1998, 1999 - Mitsubishi Eclipse II technical information manual EN