5.1 Located the device on your engine that senses the engine load (the amount of air coming into the engine. Usually this is a MAP (Manifold Absolute Position) or MAF(Mass Air Flow) sensor.
5.2 Locate the wire or wires likely to have the MAP input going to the ECM.
5.3 With the engine not urning , back probe a likely wire for the MAP input by inserting a pin down the rubber insulation far enough connect with the metal wire terminal on the inside.
5.5 Make sure all students are clear of the engine . Turn the ignition "ON"; but do not start the engine.
5.6 Record the engine reading from the meter: 3.7 vd If you do not get reading on the meter, you may have good connection , or try another wire. Try different wire.
5.7 Start the engine . Let it idle.
5.8 Record the reading from the meter: 1.5V
5.10 Describe how the MAP sensor works to tell the engine how much air comes into the engine?
This gives the correct signal to the ECU to tells how much air has entire the manifold, so the computer can guide for the right amount of fuel.
5.11 Discuss how the readings above are correct or incorrect for this engine:
According to the acceleration the reading on the multimeter changes,, so we can say this reading is good and correct, as the engine is ruining smoothly too.
5.12 What could go wrong so the ECU did not receive the correct signal from the MAP sensor?
MAP sensor monitor the vacuum and charge in the intake manifold, this provide indication of the engine load and speed fluctuation.
If the signal is incorrect ether low reading or high reading , the computer will give calculation of lean or reach this could cause back fire on acceleration for an engine urning lean and produce high HC and CO. when is reach the engine will run rough.
Draw the circuit digram for the MAP sensor on this engine in this box.
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