Issue: The Lexus ES350 sedan has 136,000 miles and is fitted with one-key smart start and smart boarding functions. Customers say they can't utilize the smart car system normally.  Diagnosis: Start the vehicle without using the smart key to approach the ignition switch, indicating that the smart entry system is not turned off (can be set to turn off), turn the vehicle power mode to OFF state, press the smart key to lock and unlock Switch, it is discovered that the vehicle can be unlocked and locked normally, without any abnormalities, the vehicle will be unlocked. The vehicle could be...

Model: 2014 Audi A7 Coupe. Driving mileage: 37282miles.   Issue: Multiple fault lights suddenly light up during driving, with ABS, tire pressure monitoring and air suspension all illuminated. The fault remains after the car is turned off and restarted.   Diagnosis: First, connect to VCDS and enter 03 detection, the fault code is 0365 of the right front wheel speed sensor, the fault code is shown in Figure 1.   Figure 1 Turn the right front wheel once the wheel is off the ground, and the wheel speed as well as forward and backward status can be displayed normally in...

  Model: CRH engine, 0BH transmission. Driving Mileage: 24,000 miles. Issue: The tire pressure light is on when the vehicle is driving. Diagnosis: the diagnostic instrument detects the vehicle fault code, ABS controller fault code: 01314 engine control unit, please read the fault code; engine control unit fault code: 00257 air quality sensor 1 signal is unreliable.  The circuit diagram of the air quality sensor G70 is shown in Figure 1.   Figure 1  SC15 powers the fuse for the air quality sensor, as shown in Figure 2.   Figure 2  Analysis of the cause of the failure:  Air quality...

  Model: A 2012 Jeep Wrangler off-road vehicle equipped with a 3.6L engine and matches the 722.6 electronically controlled 5-speed automatic transmission produced by Mercedes-Benz. The mileage is about 170,000km.  Issue: Cold car shifting delay, 2-3 gears, 3-4 gears have a serious lag phenomenon, sometimes the second or third gear will be locked after a long driving time, and the transmission ratio error of the second or third gear will be reported when the gear is locked. The fault code of the valve has been replaced with a new valve body in the previous maintenance.  Diagnosis: P0732 and P0733 are...

Model: 2016 Mercedes-Benz GLA200 (156.943), equipped with 270.910 engine and 724.001 transmission. Driving Mileage: 12,430 miles. Issue: The vehicle cannot be locked/unlocked using the remote-control key. Diagnosis: The customer reported that using the lock/unlock button on the remote-control key doesn’t lock/unlock the vehicle, and the same is true when using a different remote control key. However, the unlocking and locking switches in the car can be unlocked and locked normally. In this way, the hardware problem of the lock block can be quickly eliminated. But this car does have abnormal locking failures, so use a Mercedes-Benz special diagnostic instrument to...

Model: 2020 Audi A6L (C8), equipped with 2.0T DKWB engine and 0CK transmission. Driving Mileage: 6,308 miles.  Issue: After being parked for two days, the vehicle’s ignition switch cannot be turned on and the engine cannot be started. There is only one yellow warning light on the instrument cluster, as shown in Figure 1.  Figure 1  Diagnosis: At this time, because the ignition switch cannot be turned on, the diagnostic instrument cannot be accessed under normal conditions. It is necessary to manually input vehicle information, and then try to turn on the headlights or hazard warning lights to enter the...

A 2009 Cadillac Escalade hybrid electric car equipped with a V8 6.0L gasoline engine and matched with a 2ML70 mild hybrid PS structure type transmission. Driving Mileage: Around 105,600 miles. Issue: Continuous shuffle when accelerating at medium and low speeds, and the phenomenon is especially obvious just after a sudden acceleration on starting. Diagnosis: After picking up the car, the customer describes the fault phenomenon and shows that the car is basically normal when it’s cold and the fault is difficult to test. Also, the fault does not occur very frequently when the car is hot, so as to be...

Model: F07. Driving Mileage: 37282miles Issue: The user reports that the cruise system failure warning lamp lights up when the vehicle is driving, and the central information display screen prompts "Automatic cruise system failure! Collision function failure!" Diagnosis: After picking up the car, it is found that the automatic cruise system fault alarm phenomenon of the vehicle currently exists. Connect ISID for diagnosis and testing, and read the fault content in the vehicle fault memory as follows: 48003B: ICMACC sensor reported failure 482136: ACC sensor is out of adjustment 482130: ACC sensor test run The new ACC sensor replaces the...

  Model: CC7000ZM01BEV, with a cruising range of 310km.Driving Mileage: 14km.                                                                 Issue: After charging the battery overnight, the vehicle can be started the next day when preparing to wash the car for delivery, but after the D gear is engaged, the vehicle cannot drive, and the gear information displayed on the meter continues to flash at the N gear position, as shown in Figure 1. Figure 1 Diagnosis: Combined...

Issue: A Mercedes-Benz EQC400 pure electric vehicle in 2019, with a mileage of 2352km. The customer complained that the meter showed that the protection system was faulty and the battery light was on. Diagnosis: Start the vehicle, the instrument displays the fault of the protection system and the battery light is on. The customer reports that the car has been driven for more than a month and has been in normal use. It suddenly broke down lately when driving, and no maintenance has been done before. Quickly test the vehicle with a special diagnostic instrument for Mercedes-Benz (XENTRY), and the...

Issue: The car's keyless entry function is invalid. Diagnosis: The vehicle is new. When doing PDI, the maintenance professional discovered that the system had a fault code: “B117113 enters and starts the system antenna in the bumper is open, static," which was deleted after the fault code was removed. When testing the four-door keyless entry function, the door lock function was working, but on the second day, the customer reported the failure again. After the technician picks up the car and turns on the ignition switch, the instrument displays "Fault: Keyless System". The fault code is still B117113. The entry...

VIN: SALMN15486A××××××. Driving mileage: 33418 miles. Issue: The customer reported that the sunroof of the car could not be opened. Diagnosis: The car was brought into the factory for routine repair. The sunroof could not be opened, according to the owner. The sunroof did not respond when the sunroof switch was operated after the vehicle key was switched on, according to the fault verification. The sunroof calibration with Land Rover's unique diagnostic device yields no results. When connecting the diagnostic instrument to read the fault code, no associated fault code is found. The following are the main reasons for the...