What should I do if the automatic transmission upshift is delayed?

There are several solutions to the upshift delay of automatic transmission: 1. For electronically controlled automatic transmission, fault self-diagnosis should be carried out first. If there is a fault code, find the cause of the fault according to the displayed fault code. 2. Check the adjustment of throttle cable or throttle position sensor. If it does not meet the standards, it should be readjusted. 3. Measure the resistance of the throttle position sensor. If it doesn't meet the standard, it should be replaced. 4. For automatic transmission with vacuum throttle, unplug the vacuum hose on the vacuum throttle and check whether there is suction in the vacuum hose during engine operation. If there is no suction, the vacuum hose is broken, loose or blocked; In this regard, it should be repaired. 5. Check the forced downshift switch. If there is a short circuit, it should be repaired or replaced. 6. Measure the oil pressure of the main oil circuit at idle speed and compare it with the standard value. If the oil pressure is too high, it should be adjusted by throttle cable or throttle position sensor. Automatic transmission with vacuum throttle should be adjusted by reducing the length of throttle push rod. If the adjustment fails, remove and check the main oil pressure regulating valve or throttle valve.