Fit 1.5 What is the fault code P 1890 of the shift control system? How to solve it?

1 Check for other fault codes. If yes, fix other faults first.

2. Measure the stall speed at positions D, S, L and R. If it is greater than 3,500, replace the gearbox; If less than 2000, replace the control valve body.

3 If the stall speed is greater than 2000 and less than 3500, turn the ignition switch to the OFF position and monitor the throttle position sensor voltage between A 15 and A23 or A24 of PCM. Engage D gear, drive on a flat road at a speed of 60KM/H, and measure whether the engine speed is 2200 2200-3 100RPM when the throttle position sensor voltage is 2.0V?

Yes, replace the control valve body.

No, change the gearbox.