According to the owner to reflect the normal start of the vehicle, but the acceleration in the slow, and fuel consumption significantly higher than auto key programmer before. Sometimes the engine failure warning light will be lit, then turn off the engine and restart, the engine failure warning light will go off normally.

Troubleshooting: start the engine, idle conditions smooth. In situ to accelerate, the engine response is good. The use of diagnostic equipment on the engine system for self-diagnosis, a fault information, the content is exhaust gas turbine Zhuang Zhuang pressure on the village is too low. Select the test plan, the diagnostic instrument given the reasons for the failure included. The vacuum launch x431 v supply device of the pressure reducing device is defective, the pressure reducing valve is defective, the pressurized air duct is bad, the turbocharger is damaged, the exhaust back pressure is too high, the exhaust pressure of the cylinder cover / engine is bad. Check the appearance of the exhaust turbocharger without signs of damage. Check the vacuum pipe, no shedding, bending phenomenon. Measure the vacuum pressure, in the range of -90kpa, within the standard value range. Check the piping of the exhaust gas bypass valve. Check the pressure relief valve, also did not find the problem. In order to check whether the meta-catalyst is blocked, the oxygen sensor at the front end is removed, and the endoscope is opened in the hole. The honeycomb hole inside the meta-catalyst is blocked.

Troubleshooting: Replace vvdi mb bga tool password calculation two ternary catalytic converters, troubleshooting completely.

Fault Summary: exhaust back pressure is too high refers to the exhaust pipe exhaust row does not go out in the exhaust pipe to form a higher pressure, this vas 5054a phenomenon will lead to exhaust gas flow rate is greatly reduced. Hinder the turbine operation, causing the supercharging pressure is too low. Common reason is the three-way catalyst blockage, fault symptoms in the vehicle at high speed that is more obvious.

Posted by: obdtool at 07:15 AM | Comments (2) | Add Comment
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K5 car during normal driving air conditioning suddenly no cooling, out of the natural wind. Analysis of the reasons: 1, the fuse blown 2, the pressure is too high or too low 3, the water cardiag temperature is too high 4, air conditioning control module 5, the engine ECU 6, the evaporator temperature sensor 7, wiring harness and other.

Then check:

1, first check the fuse is not blown, air conditioning controller wind speed, mixer temperature adjustment, AC switch and other modes are Normal, connected to the pressure gauge low pressure display 3bar, high pressure display 6bar, measuring the compressor ECV solenoid valve voltage is 0V,Indicating that the compressor is not working at this time;

2, connect the GDS, enter the engine system without fault code, observe the data flow: (1) air conditioning switch request to the ECU OFF (2) AC ON condition OFF (3) Air conditioning compressor OFF (4) Water temperature 85 ° C (5) Throttle opening 3% (6) Air conditioning line pressure 5.5bar from a few signals which reflect the air conditioning module AC mb star switch signal in the closed state, no Output control of the compressor signal, measuring the compressor ECV 1 and 2 pins to the air conditioning module of the 35-pin and 36-pin conduction, harness No break;

3, measuring waveform; measuring condor xc mini air conditioning module high CAN32 and low CAN33, engine ECU high CAN85 and low CAN63, waveform Normal, the wiring harness and other modules out of the fault.

4, the fault point locked in the air conditioning control module.

Posted by: obdtool at 07:06 AM | Comments (5) | Add Comment
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