[Repair Case] 2019 Audi A3 cruise control function fails

Posted by Tony Brown on

Model: 2019 Audi A3. Fault phenomenon: The cruise control function fails. Troubleshooting:  (1) Read the trouble code with the ODIS diagnostic instrument: 01—engine control unit record—U041600—ESP untrusted signal (active/static). (2) According to the test plan, it is necessary to compare the configuration of the SVM control units for 01-engine control unit J623 and 03-ABS control unit J104. After the online SVM comparison, it is prompted that the two control units are configured correctly and do not need to be changed. (3) At this time, the ODIS diagnostic instrument has been unable to provide the test plan for maintenance and can...

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[Repair Case] 2018 Mercedes-Benz E300 instrument prompts "Blind Spot Assist System Stops Working"

Posted by Tony Brown on

[Repair Case] 2018 Mercedes-Benz E300 instrument prompts "Blind Spot Assist System Stops Working"

Model: Mercedes-Benz E300, equipped with 274.920 engine. Driving mileage: 12,415 miles Fault phenomenon: The instrument prompts “Blind Spot Assist Has Stopped Working”. Troubleshooting: Connect the XENTRY diagnostic instrument and conduct a quick test. The integrated radar sensor in the left rear bumper of the B92/11 has set a fault code: C110100 radar sensor 1 has a functional failure, A+S. Check the car’s registration card to confirm that the car is equipped with a blind spot assist system (code 234). The blind spot assist system uses short-range radar to monitor the rear and side areas of the vehicle, and if necessary,...

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[Repair Case] 2019 Audi uses a 3D printer to make an Audi e-tron gearbox installation

Posted by Tony Brown on

[Repair Case] 2019 Audi uses a 3D printer to make an Audi e-tron gearbox installation

Model: e-tron System: Transmission Year: 2019 Driving mileage: 9,383 miles Issue: The driver's guide in the instrument cluster displays "Coolant level too low" and the coolant indicator light illuminates in red. Troubleshooting: First check that the coolant level in the expansion kettle is below the lower limit mark. Connect the diagnostic instrument to read the fault code, there is a fault code in the temperature management system control unit J1024 (address code C5): the coolant is insufficient, and the low liquid level of the sensor is displayed. Next troubleshooting for the coolant leak revealed excess coolant inside the front motor....

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[Repair Case] 2021 Mercedes-Benz GLA200 instrument prompts "auxiliary battery failure"

Posted by Tony Brown on

[Repair Case] 2021 Mercedes-Benz GLA200 instrument prompts "auxiliary battery failure"

Model: 2021 Mercedes-Benz GLA200 Issue: The meter displays a white text prompting "Auxiliary battery failure". Troubleshooting: The problem persists, and there is no unusual sensation while driving. Connect the diagnostic instrument to do a brief test and discover that the N73 has set a fault code for the current state: the B21DC01 electronic ignition switch's buffer battery is malfunctioning. Check the vehicle registration card; this vehicle has CODE429, is equipped with a 700.4 seven-speed dual-clutch automatic gearbox, and the parking pawl lifting solenoid valve L21 is part of the electromechanical parking pawl placed on the dual-clutch transmission's casing (as shown...

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[Repair Case] 2019 Volvo XC60 airbag light alarm

Posted by Tony Brown on

[Repair Case] 2019 Volvo XC60 airbag light alarm

Model: XC60 System: Electrical Year: 2019 Issue: The air bag light on the instrument lights intermittently.  Troubleshooting: The owner of the car reported that airbag light of the car was on, and sometimes the braking was not easy to use. We heard that he had been to the repair shop for inspection before, yet no problem was found. The car did not light up after being promoted to a higher level, and it has not been used very much recently. We connected the diagnostic instrument and discovered that different modules such as airbag SRS, instrument DIM, wiper switch, air conditioning...

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[Repair Case] 2016 BMW 316Li engine 3-cylinder misfire

Posted by Tony Brown on

[Repair Case] 2016 BMW 316Li engine 3-cylinder misfire

A few days ago, a 2016 BMW 316Li was sent here by our friends for maintenance. This car is equipped with an N13 engine, and has two fault codes: cylinder No.3 misfire detected and cylinder No.3 injection device off. The ignition coil, spark plugs, and injectors have all been replaced, and the engine has also been disassembled. It is said that a valve is bent and should be replaced, but the problem remains still as the cylinder No.3 misfire. They had already tested the cylinder pressure, and there’s no significant difference between the 4 cylinders, all around 1100kPa. During the...

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[Repair Case] Audi Q5 cruise control system is unavailable

Posted by Tony Brown on

[Repair Case] Audi Q5 cruise control system is unavailable

Car: Audi Model: Q5 System: Engine Fault phenomenon: The cruise control function can be activated when idling, and the speed of the cruise control can also be increased or decreased (as shown in Figure 1), but the cruise control function cannot be activated when the vehicle is driving.   Figure 1 Diagnosis: The test drive finds that the cruise control function and the engine start-stop function is not available. Check the relevant system with a diagnostic tool, we didn't find any trouble codes. Looking at the reason preventing the engine from stopping is the "diagnostic interface", the diagnostics have no...

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[Repair Case] 2022 Land Rover Range Rover after turning on the air conditioner, it automatically turns off.

Posted by Tony Brown on

[Repair Case] 2022 Land Rover Range Rover after turning on the air conditioner, it automatically turns off.

Car: Land Rover Model: Range Rover System: Air Conditioning Year model: 2022  Fault phenomenon: The customer complained about operating the lower display screen of the integrated control panel after starting the vehicle, and found that after the vehicle air conditioner was turned on, it automatically turned off. After the test vehicle seat heating and cooling functions were turned on, it still automatically turned off. The driver found this fault, which has nothing to do with the ambient temperature and is permanent. Check that the vehicle has no additional or modified items, and the maintenance history query has no relevant maintenance...

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[Repair Case] 2021 Buick GL8 right electric sliding door failure

Posted by Tony Brown on

[Repair Case] 2021 Buick GL8 right electric sliding door failure

Car: Buick Model: GL8 System: Electrical Year: 2021  Fault phenomenon: The right-hand power sliding door cannot be closed electrically via the headliner or the right-hand B-pillar closing switch.  Troubleshooting: After receiving the customer's repair request, the following inspections were carried out according to the SBD process:  Understand and confirm the fault description. Ask the customer about the time, place, phenomenon, and frequency of the failure. The customer just bought a new car, and when he was about to install it in the modification shop, he found that he pressed the closing button of the electric sliding door on the right...

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[Repair Case] 2014 BMW 520Li central control door lock can only be locked but not opened.

Posted by Tony Brown on

[Repair Case] 2014 BMW 520Li central control door lock can only be locked but not opened.

Fault phenomenon: The owner of this car reported that the central control door lock did not work properly. The specific phenomenon is that when the door is locked with the remote control, the 4 doors can be locked normally. When the door is opened with the remote control, the 4 doors cannot be unlocked. Only the left front door can be opened with the mechanical key to enter the car, and the vehicle starts normally.   Troubleshooting: After picking up the car, we first confirm the fault. It is indeed as described by the car owner that the door can...

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【Repair Case】2012 BMW 730Li left front door cannot be opened

Posted by Tony Brown on

【Repair Case】2012 BMW 730Li left front door cannot be opened

Model: F02, equipped with N52 engine. Driving mileage: 7659 miles.  Fault phenomenon: The left front door of BMW 730Li could neither be opened inside or outside, and the other three doors were kept unlocked and could be opened on both sides.  Diagnosis: There is no relevant fault record detected by the diagnostic instrument. When the car is locked with the car key, the four door locks do not respond, only the trunk and fuel tank cover can be locked, and there are double flashing warning signs. When unlocking with the car key, the 4 door locks do not respond, the...

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[Repair Case] 2020 Porsche Macan PSM system compound failure

Posted by Tony Brown on

[Repair Case] 2020 Porsche Macan PSM system compound failure

Car: Porsche Model: Macan System: Engine Year model: 2020  Troubleshooting: Use a diagnostic instrument to detect the fault code in the PSM control unit (commonly known as ABS anti-lock braking system): 011D03 Mechanical failure of the right front wheel speed sensor, other control unit fault codes are the accompanying fault codes caused by the PSM system fault, and other faults when the instrument is on, the light is caused by a malfunction of the PSM.  The technician replaced the right front wheel speed sensor based on the previous maintenance experience, cleared the fault code, and tested the car. The customer...

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