It doesn't look like your meter will measure more than 200mV, it's hard to tell without actually using it, so I don't know if it will work on measuring the sensor voltage directly. As far as checking ground continuity and other circuit continuity, set it at the diode symbol (little arrow pointing into a straight crossbar) /speaker symbol (little arcs getting smaller). It should beep when you have the two leads on two points that are connected electrically, such as the ECM case to chassis ground.
On your meter the green settings are for amperes, which are a measurement of electrical flow volume similar to how water is measure in gallons per hour. The orange settings are for voltage, similar to water pressure. The grey settings are for resistance, and the red setting is AC volts.
Make sure the leads are plugged into the correct holes on the meter before measuring current, or you'll blow your meter up. They appear to be properly plugged in on the first pic for measuring voltage and resistance.