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2005 buick lesabre speedometer problems
Troubleshooting the abnormal speedometer of Buick lesabre 2.4L car! A Buick lesabre with a mileage of about 178000 km and a 2.4L engine and automatic transmission. The user reported that when the vehicle's speed is low, the speedometer sometimes fluctuates between 150 and 160 km/h, and the gear is displayed in the D position. When the gear lever is moved, the display remains unchanged in the D position. There is no fault sometimes and there is no rule.
Abnormal fault diagnosis of speedometer on Buick lesabre 2.4L car. Analyze the fault cause according to the fault phenomenon. The relevant information of vehicle speed and gear is transmitted to the instrument by the transmission control module through the data line. If the transmission control module does not work properly, the instrument will not display relevant information correctly.
Use the TECH2+CANDI scan tool to diagnose the vehicle and find that it cannot communicate with the transmission control module, which means there is a problem with the transmission control module! Refer to the electrical circuit diagrams and check the transmission control module circuit. Check the harness side of the control module. There is no voltage at J1-32 pin. It is found that this pin is damaged by water ingress and corrosion. Vehicle troubleshooting. Replace the damaged control module and harness, and troubleshoot the test run. Summary of Abnormal Maintenance of Speedometer on Buick lesabre 2.4L car. The fault reason of this vehicle is that the power line of the module is aged and corroded due to water ingress, the circuit is open, and the transmission control module does not work without power supply. The control module cannot work normally and cannot transmit information to the instrument, so the instrument cannot display the gear normally.
During the driving process of Buick Regal, the acceleration was suddenly weak and the speed pointer suddenly returned to zero. Find the oil way first! Replace the diesel filter element when the refueling is not awesome. Second, check whether there is oil leakage. If the oil inlet leaks, it will cause air inlet. Check whether the fuel head pressure is enough. If it is enough, check the gasoline pump. Another strange thing, please measure the lower cylinder pressure. When the pressure is not enough, find the gas path. Check the valve clearance from the air filter to the inlet valve. If all of these works. That is why the engine should be removed to check the piston ring and the speedometer pointer should return to zero: 1. There is a fault with the speed sensor and the sensor drive mechanism, resulting in the speedometer can not move; 2. The fault of the speedometer itself (speedometer) or the speed or mechanism of the connection between the sensor and the speedometer can be detected with a diagnostic instrument, which can easily determine where the fault point is.
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