Adnan liana's engine is equipped with MAP sensor(manifold absolute pressure),not the maf (mass air flow)sensor BUT at place of maf they have given IAT (intake air temperature)sensor which is attached on hose between air inlet and air cleaner.Map is located on air inlet.
Now the problems,As Map sensor measures the absolute pressure inside the engine intake manifold which is directly related to the engine load. The accompanied symptoms for a Map sensor fault could include lack of power, rough idle, as well as too high or too low idle speed.
Trouble code on scan tool when Map sensor is concerned are p0105,p0106.
Now what cause this sensor to react badly,
This might a little problem like the wiring attached from ecu to this sensor,ECM could use the signal from the MAP sensor to check the operation of the EGR (Exhaust Gas Recirculation) system, as well as to check rationality of other sensors so other sensors co related with Map can cause it to show wrong signals to ecu,blocked exhaust or catalytic converter.
It might help other members to understand what Map sensor actually is and how it works.
Map sensor is a three wire sensor and is connected to the ECM. One wire receives the 4.8 Volts from the ecu of liana, another wire is connected to the ground. The third wire is a signal wire. The MAP sensor signal voltage changes between about 2 Volt and 4.8 Volts depending on the pressure.
The signal voltage with the ignition key ON, engine OFF should be around +-4.8 Volts. With the engine running at idle, the signal voltage should drop to around +-2 Volts, when the engine is accelerated, the signal should change to around 4 to 4.5 or 4.8 Volts.
The above written article would help you to answer the last question you asked here,means how to check?
Well,to check it,With the ignition ON, check the 4.8+- upto 5 Volts with the voltmeter at the sensor's output wire. Next, check the signal voltage, see what it reads with the ignition key ON, engine start but idle and if it changes to +-2 volts its ok,for further satisfaction accelerate and notice the volts on meter it should be +- 4.8 again.
Hope it helps.