Throttle matching method of Buick LaCrosse after cleaning

The engine control module (ECM) reads the air flow through the throttle body to ensure the correct idle speed. The air flow reading is stored in the engine control module. These values are read in to adapt to product changes. During the service life of the vehicle, these values will continue to be read to compensate for the reduction of air flow caused by coking of the throttle body. These values must be re-read when the throttle body air flow changes, for example, due to cleaning or replacement. The engine throttle body is seriously coked and needs to be cleaned or replaced. It may take several driving cycles to read out the coking situation. To speed up the procedure, the scan tool can reset all readings to zero. The new engine control module of also sets these values to zero. If the reading does not match the actual air flow, the idle speed may be uneven or a DTC may be set. LaCrosse throttle matching steps: 1. Make sure that the accelerator pedal is completely released. 2. Turn the ignition switch to the on position. 3. Turn the ignition switch to the off position and wait at least 10 second. At this time, it is confirmed that the throttle action exceeds 10 second through the action sound of the throttle. 4. Start the engine and preheat it to normal working temperature. 5. Check and confirm that the water temperature and other conditions are normal. 6. Turn off the ignition switch and wait at least 10 second. 7. Quickly repeat the following operations five times in five seconds. Fully depress the accelerator pedal. Loosen the accelerator pedal completely. 8. Wait for 7 seconds, fully press the accelerator pedal, and keep this state for about 20 seconds until the MIL stops flashing and starts to light up. After 9.9 seconds, completely release the accelerator pedal within 3 seconds. The MIL light is on. 10. Start the engine and let it idle for a period of time. Matching method of throttle valve in maintenance programming of Buick LaCrosse ECM: At present, some automobile manufacturers do not require every 4S shop to improve its service level and realize "customer care and value-added service" with first-class brand, first-class service and first-class quality. On the contrary, they implement technology blockade and price monopoly, so that car buyers can't maintain without going to 4S stores to protect the interests of dealers. For example, Shanghai GM sent the matching method of LaCrosse electronic throttle after cleaning to 4S shop, and it was necessary to input the wrong information twice to input the correct information, which shows their good intentions. Electronic throttle idle speed control system is more suitable for carbon deposition. Do not clean the electronic throttle body at will unless required by the diagnostic procedures or maintenance procedures in the maintenance manual. Maintenance is risky, please use this method carefully and operate it carefully. If the idle speed of the vehicle is too high due to the maintenance of cleaning or replacing the electronic throttle body, it is recommended to perform the following ECM maintenance programming twice after confirming that the circuit is normal and no parts are damaged. Take LaCrosse 2.4L as an example. Other models operate in the same way, just replace the corresponding VIN. 1. First, program the calibration procedures of other engines with different configurations (but only LZC and LZD, LaCrosse 3.0L) into the ECM of the faulty vehicle. (1) Request information from the faulty vehicle. When Tech2 asks if the vehicle identification number is correct, selectNo.. Connect Tech2 to a PC and download the calibration program. When TIS2000 requires the input of VIN, please input another VIN with different engine configurations that TIS2000 can recognize (for example, LSGWV53C46S 128290). Be careful not to enter the VIN of the faulty vehicle at this time. Complete the remaining maintenance programming steps. (4) Note that after the first maintenance programming, the calibration files of other engines with different configurations have been programmed into the ECM of the faulty vehicle. Do not start the engine at this time. 2. Repeat step 1 for the second maintenance programming, but the VIN in it needs to be changed back to the VIN of the faulty vehicle. After completion, the calibration procedure of the faulty vehicle can be reprogrammed into the ECM of the faulty vehicle. After the above two steps of programming, the existing idle learning value in ECM can be cleared. At this point, clear the fault code and start the road test vehicle. If there is still a problem, there are other problems with the vehicle. Please follow the steps in the maintenance manual for daily inspection and maintenance.