First of all check damage of terminals : Check terminals for contact resistance, corrosion and deformation.
Inspect intake system leakage and EGR solenoid valve first before inspecting MAFS.
IG S/W 'OFF', ENGINE 'OFF'
Inspect contamination of air cleaner filter.
- Terrible contamination of air cleaner filter.
- Wetting of air cleaner filter.
Inspect foreign substances (leaves, paper, vinyl) in front of MAFS and damage of the grid of MAFS.
IG S/W 'ON', ENGINE 'ON'
Connect scantool to Data Link Connector (DLC).
Allow the engine to warm up to normal operating temperature.
Electrical system and A/CON 'OFF'.
Select 'Air Mass Flow', 'EGR Actuator' and 'Engine speed' parameters on the scantool.
Monitor 'Air Mass Flow' data when 'EGR actuator' is not operated (0.0%) at idle, 1,500 rpm, 2,000 rpm, 2,800 pm, 3,500 rpm.
※ MAFS current data (Load is not applied)
Idle | 1500RPM | 2000RPM | 2800RPM | 3500RPM | |
Air mass flow(Kg/h) | 47Kg/h±10% | 110Kg/h±10% | 145Kg/h±10% | 196Kg/h±10% | 240Kg/h±10% |
☞ EGR actuator is operated for approx. 60 seconds after racing the accelerator pedal at warm up idle (Neutral, Load is not applied) and 'EGR actuator' duty is to 0.0 % after 60 seconds.
☞ EGR actuator is not operated while accelerating (Load is not applied).
Symptom | Inspection procedure | |
Case1 | ● MAFS is higher than specification at idle and each rpm. | ● Inspect intake system leakage between VGT turbocharger and intake manifold. |
Case2 | ● MAFS is lower than specification at idle and each rpm. | ● Inspect intake system leakage between VGT turbocharger and intake manifold. ● Replace MAFS ● Inspect throttle flap valve close stuck. |
Refer to 'Loosen (Tighten) the Clamp of intake manifold' of detail inspections (Equipment settings).
