- EXUP servo motor operation. Out of specification → Replace.
a. Check whether or not the EXUP valve is seized.
Disconnect the EXUP cable and check that the EXUP valve is moved smoothly by hand.
When the valve is not moved smoothly, repair or replace it. Refer to «Adjusting the EXUP cables».
b. When the EXUP valve is moved smoothly, replace the EXUP servo motor.
c. Perform the self-diagnosis mode and check the operation of EXUP valve by visual inspection (Code No: 53).
The operation should be carried out as 3-second drive in the full open direction, 2-second stop and 3-second drive in the full close direction.
d. Check that the EXUP servo motor pulley rotates several times.