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Installation and fault finding
Removal and installation
- Disconnect the MAF Sensor connector. Remove the screws and plug-in type MAF Sensor. If MAF Sensor has a suction pipe, loosen the pipe clamps that locate the MAF Sensor into the air intake duct and remove the MAF Sensor
- Install the new MAF Sensor with the screws into the air intake duct and connect the MAF connector. If the MAF Sensor has a suction pipe, tighten all pipe clamps. Turn the engine on and check if the intake system works properly
- Check the entire air intake system for leaks and make sure that the O-ring is not cracked or jammed when installing it
MAF Sensor contamination or damage is usually caused by an Air Filter that is in poor condition or incorrectly installed. A damaged or contaminated MAF Sensor can still function, but the changes to its characteristics can cause a wide variety of driving problems.
- Poor startup: First combustion occurs, but combustion is incomplete.
- Instability at idling: High idle speed, low idle speed or unstable idle.
- Poor drivability: Hesitation during acceleration, engine backfires, abnormal knocking or black smoke emitted.
- Stalling: Shortly after startup, when accelerator is depressed or released.
A problem with the MAF Sensor can cause the engine warning light to turn on. This fault is stored as a diagnostic trouble code (DTC) in the engine ECU and can be inspected by a DTC scan tool. However, if the root cause of failure is a clogged MAF Sensor passage, the engine will usually start, will run poorly or stall, and may not set a DTC. If the MAF Sensor is defective, it will need to be replaced. This is a very simple process. If the MAF Sensor is contaminated, cleaning it may provide a temporary solution; but this may damage the Sensor’s delicate hardware. If the MAF Sensor is replaced, make sure the air filter is also installed properly.