[Repair Case] Lumina can’t drive at high speed

Posted by Tony Brown on

[Repair Case] Lumina can’t drive at high speed Model: 3.1L engine and automatic transmission. Issue: When the car is operating, the driver reports that it becomes harder to increase the speed even if the accelerator pedal is depressed. The vehicle's top speed is limited to 44 miles per hour. After inspection by maintenance staff the defect is assumed to be the automatic gearbox lock. The automatic transmission system is in good working order, transmission oil is adequate, and the internal friction components are not overly worn or burned. Diagnosis: A stall test was performed. The drive gear has a stall...

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[Repair Case] Chevrolet sports car cannot start

Posted by Tony Brown on

Issue: The car was towed to the repair shop for maintenance because it wouldn’t start. The preliminary inspection result showed that there was a high-pressure fire, but there was no fuel injection. Troubleshooting:  The engine is equipped with a HEI-EST ignition system, which stands for high-energy electronic ignition. For the fire test, we unplugged the sub-cylinder high-voltage cable to test for firing; the sparks were very strong. Next, we used chemical cleaner into the intake manifold, and the engine could barely operate. We used an external pump instead of the fuel pump of the original car to build up the...

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[Repair Case] Audi A6 stalls when warming up and has difficulty restarting

Posted by Tony Brown on

Model: Audi A6, equipped with 2.4L engine. Driving Mileage:31068 miles.  Issue: According to the driver, the engine is prone to stall failure during the driving process after warming up, and it is difficult to restart the vehicle after stalling.  Troubleshooting: There is no failure code when using the Chinese V.A.G1551 diagnostic tool to self-diagnose the engine control system. When starting the engine, it runs smoothly at idle speed in idling conditions. There was no visible aberrant data when it was examined. The problem is considered to be in the engine fuel delivery system, based on the fault characteristic mentioned by...

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Porsche

Posted by Tony Brown on

Make: Porsche Model: Cayenne. Mileage: 168,365 miles The gear display of the Porsche Cayenne is abnormal. Troubleshooting: Verify the fault after connecting the car. As stated by the customer, the diagnostic instrument detects that the transmission reports a fault, and the selector lever switch is grounded. Modules related to gear display include transmission control unit, gear switch, gear selector switch, and transmission valve body control unit. The gear selector switch is located under the cover of the gear lever. After disassembling, it is found that there are obvious traces of water ingress. Measure according to the circuit diagram and find...

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520Li Fuel Pump Control Regulation Voltage Faulted

Posted by Tony Brown on

[Repair Case]: 520Li Fuel Pump Control Regulation Voltage Faulted Issue:  A 2011, BMW 520Li, model F18, with an odometer reading of approximately 25,000 miles. The vehicle was unable to accelerate while driving, and the user noted that the motor shook severely after stopping, before turning off the engine. The instrument's engine fault light illuminates, signaling a problem, and the central information display reads, "The engine power is down, the fuel system has something wrong!" The vehicle can be re-started and driven normally after it has been parked for a period of time.  Diagnosis:  Observe that the engine runs smoothly in...

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A Cadillac’s front wheel and steering wheel shake while steering.

Posted by Tony Brown on

[Repair Case] A Cadillac’s front wheel and steering wheel shake while steering. Car Series: Cadillac Model: SRX/Kay Leide System: Chassis Issue: When faced with a fast steering or a large turning angle, the front wheel generates a gap brake, and the steering wheel shakes. Diagnosis: Checking the brake mechanism and steering mechanism of the vehicle, no looseness was found. Using car code reader to check the electronic stability system, we got the following error codes: C0460, C046. They indicate ranges for the steering wheel position sensors. Re-entering the data system analysis, it turned out that the steering angle measured by...

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BMW 520Li

Posted by Tony Brown on

Make: BMW 520Li Model: F18. Driving mileage: 49,710 miles Trouble phenomenon: The user reported that the instrument steering system failure warning light was on when the vehicle was driving, and the central information display screen prompts "Steering system, please drive carefully!" When turning the steering wheel, the turning becomes very heavy. Fault diagnosis: Upon inspection, the issue is confirmed, the EPS fault alarm lamp on the instrument panel continues to light up to give an alarm. When turning the steering wheel, the feeling is very heavy, and not assisted. Connect ISID for diagnostic testing, the EPS displayed in the diagnostic tree...

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[Repair Case] BMW E66 all instrument warning lights are illuminated.

Posted by Tony Brown on

[Repair Case] BMW E66 all instrument warning lights are illuminated.

Issue: The customer comes to the store stating that all instrument warning lights are illuminated (as shown in Figure 1), yet the car drives normally.Figure 1 Instrument warning panel (showing all lights on)Model: E66, equipped with M54 engine and 6HP-19 transmission.Driving mileage: 98281 milesDiagnosis: Use ISID to detect fault codes and found the following:CDAB, A389, E107, 5EFE, 5142, A383, A3AA, 9328, 51B9, D707, E287 According to the above fault code analysis, there are several possible causes: ①Damage to multiple control modules or short circuits within a single control module; ②The K-CAN bus system is open or short-circuited; ③Incorrect bus voltage.Moving...

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BMW X5 Light issues caused by footwell module

Posted by Tony Brown on

BMW X5 Light issues caused by footwell module

Model: E70, equipped with a 3.0L engine.  VIN: WBAFE4105AL××××××.  Mileage: 84380 miles  Issues:  The customer reported that the two front headlights were always on and could not be turned off, and the turn signal could not be turned on. In addition, none of the windows could be raised or lowered, and the driver window control switch was inoperable.  Diagnosis:   The screen displays prompts to repair the lighting system.  In the test, it was also found that in addition to the malfunctions reported by the customer, the front fog lamp switch failed. After checking all related fuses in the vehicle’s fuse...

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