MAF uses the features of sensor heater, after HOT FILM units calculate the intake air quantity, then send the signal to ECM. ECM uses the signal to decide the timing for EGR operation.
Mass air flow (kg/h) | Output voltage (V) |
8 | 1.19 ~ 1.20 |
10 | 1.25 ~ 1.27 |
15 | 1.39 ~ 1.42 |
30 | 1.75 ~ 1.78 |
60 | 2.22 ~ 2.27 |
120 | 2.79 ~ 2.85 |
250 | 3.51 ~ 3.58 |
370 | 3.94 ~ 4.00 |
480 | 4.24 ~ 4.32 |
When Ignition switch is turned on, if AFS output voltage is not "0" (engine stops), inspect the malfunction of AFS and ECM.
Even though AFS output voltage is abnormal, if engine is at idle, inspect the following conditions.
Chect the poor attachment of airflow, cut air duct, and air cleaner filter branched from AFS.
Bad combustion in the cylinder or fault injector.
Even if no AFS malfunction occurs, check the mounting dircection of AFS.
Use correct digital voltmeter.
Before inspection, warming up the engine till the engine coolant temperature is up to 80° ~ 90°C.
Refer to P0102, P0103 DTC inspection procedures.
