When driving in forward gears, even with the accelerator pedal held still, the automatic transmission frequently experiences sudden downshifts, resulting in an abnormal increase in engine speed and a shift shock
Troubleshooting:
① Faulty throttle position sensor;
② Faulty vehicle speed sensor;
③ Poor grounding in the control system circuit;
④ Poor contact in the shift solenoid valve;
⑤ Faulty computer.