Chapter 3 Automotive Test
41
Figure 3-21 Lambda (Oxygen Sensor) diagram
3.2.11
MAP
The MAP, or Intake Pressure sensor is used to sense the pressure of the intake manifold and send it to the ECM to
determine the fuel supply, vacuum (or light load), and ignition timing advance angle. There are two kinds of analog
and digital, usually there are 3 wires, power, signal, ground, or together with other devices.
For the analog signal of a gasoline engine, when the throttle is closed or the engine is turned off, the output voltage
is 0, and the output is generally about 1V at idling speed (it may be slightly higher or lower). After quickly depressing
the accelerator, the throttle opens and the voltage rises rapidly. Achieve above 4.5V.
For the analog signal of the diesel engine, the voltage is between 1.5-2.0V at idling speed. After stepping on the
accelerator, the voltage can be seen to rise, which can reach 4.0V.
Use ATO oscilloscope to test the intake pressure sensor, the specific operation is shown in Figure 3-22 below:
Summary of Contents for ATO1000 Series
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Page 52: ...Chapter 3 Automotive Test 49 Figure 3 30 Electronic fuel pump test ...
Page 71: ...68 Figure 3 49 K line test ...
Page 79: ...76 Figure 3 57 Mazda 6 Cylinder internal pressure measurement ...
