What to Do About Delayed Upshifting in Automatic Transmissions?
1 Answers
Automatic transmission delayed upshifting can be addressed with the following solutions: 1. For electronically controlled automatic transmissions, first perform a fault self-diagnosis. If there is a fault code, identify the cause of the fault based on the displayed code. 2. Check the adjustment of the throttle cable or throttle position sensor. If it does not meet the standard, readjust it. 3. Measure the resistance of the throttle position sensor. If it does not meet the standard, replace it. 4. For automatic transmissions using a vacuum-type throttle valve, disconnect the vacuum hose on the vacuum-type throttle valve and check for suction in the hose while the engine is running. If there is no suction, it indicates the vacuum hose is cracked, loose, or blocked; repair it accordingly. 5. Check the forced downshift switch. If there is a short circuit, repair or replace it. 6. Measure the main oil circuit pressure at idle and compare it with the standard value. If the pressure is too high, adjust it via the throttle cable or throttle position sensor. For automatic transmissions using a vacuum-type throttle valve, reduce the length of the throttle valve pushrod to adjust. If adjustment is ineffective, disassemble and inspect the main oil circuit pressure regulator valve or throttle valve.
