The VW Magotan engine fault lamp is lit, power down

A mileage of auto diagnostic tool about 90,000 km in 2009 Volkswagen MAGOTAN 1.8TSI cars. The owners reflects: car engine fault light is lit, power down.

Take the car: maintenance staff detected the engine control unit, found fault code 00257 ---- Air flow measurement value untrustworthy. Clear fault codes posterior test, fault code appears again View freeze frame failure in the vehicle accelerated process. 01-08-32 data set, reading the engine control unit idling into the adaptive value of -5.3, part load into the adaptive value of - 8.6%, indicating that the engine control unit for control of the gas mixture is normal. This ruled out the possibility of failure of the air flow meter, the issue should be out in the pressurization system.

Connection auto code reader failure diagnostic road test the engine's intake air quantity data (Figure 1) was observed when the vehicle is in hard acceleration. The analysis of data found that the sharp increase of the loading rate, the feed rate of the engine but slow growth. In the extreme case, when the engine load rate is maintained at 100%, the intake air quantity after nearly 7s time before it reaches the maximum value. This shows that the efficiency of the air intake of the car engine problems.

Road test again, the low Launch X431 speed of the vehicle suddenly accelerated pedal in the end, while observing the engine control unit 115 3, 4 zone data. The observed growth throttle before the actual air pressure is always higher than the target pressure growth retardation, and the maximum value of the actual pressure can only reach 160 kPa is significantly lower. May speculate that the engine's intake system for leaks.

Carefully check the engine intake conduit, and found that in the cooler to the throttle body conduit oil leakage phenomenon (Fig. 2). After the collapse of the oil clean, found cracks in this pipeline. This finding just explain the causes of the fault codes, because when the higher pressure within the intake pipe, cracks is up to open, so that the air output of the turbocharger wastage, so that the intake air quantity will not be able to reach the engine control unit auto scanner the expected value .

Troubleshooting: Replace the intake manifold, and troubleshooting.