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2004 buick rendezvous speedometer problems
Buick rendezvous carspeedometer abnormal troubleshooting: A Buick rendezvous with a mileage of about 178,000 km, equipped with a 2.4L engine and an automatic transmission. The user reported that when the speed of the car is at a low speed, the speedometer sometimes fluctuates between 150-160km/h, and the gear position is displayed on the D gear. When the gear lever is moved, the display is still in the D position and does not change. Faults come and go, without any pattern.
Fault Diagnosis of Abnormal Speedometer of Buick rendezvous 2.4L Car:
According to the fault phenomenon, analyze the cause of the fault. The relevant information of vehicle speed and gear is transmitted to the instrument by the transmission control module through the data line. If the TCM is not functioning properly, the gauges will not display the relevant information correctly. Use the TECH2+CANDI fault diagnosis instrument to diagnose the vehicle, and find that it cannot communicate with the transmission control module, indicating that there is a problem with the transmission control module! Check the transmission control module circuit by referring to the wiring diagram. Check the wiring harness side of the control module, there is no voltage at the J1-32 pin, and it is found that this pin is corroded and damaged by water. Car troubleshooting. Replace the damaged control module and wiring harness, and troubleshoot the test run. Summary of Abnormal Speedometer Maintenance of Buick rendezvous 2.4L Car: The reason for the failure of this car is that the power line of the module is aged and corroded due to water entering the vehicle, the line is broken, and the transmission control module does not work without power. The control module is not working properly and cannot pass information to the instrument, so the instrument cannot display the gear normally.
During the driving of Buick Regal, the speed pointer suddenly returns to zero due to the sudden weakness of acceleration. First, find the oil way! Replace the diesel filter element when the refueling is not awesome. The second is to check for oil leaks. If the oil inlet leaks, it will cause air intake. Check if the fuel head pressure is sufficient, and if so, check the gasoline pump. Another strange thing, please measure the cylinder pressure. When the pressure is not enough, it's time to find the gas path. The air path runs from the air filter to the intake valve to check the valve clearance. If all of these are fine. That's to dismantle the engine and check the piston rings.The reason for the pointer of the speedometer returning to zero is: 1. There is a malfunction with the speed sensor and sensor drive mechanism, which causes the speedometer to not move; 2. If the speedometer itself has a fault (Speedometer), or if the linear speed or mechanism connecting the sensor and Speedometer has a fault, you can use the diagnostic apparatus to detect it, so that you can easily determine where the fault is.
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