Slipping/Delayed 4-5 Upshift or No 4th Gear

Affected Vehicles:

CAUSE:
Adjustment screw of Control valve Y3/1y2 (arrow) becoming loose and changing pressure setting to fifth gear brake (BS).

NOTE: Vehicles that have already been inspected and/or corrected, have two red marks on the top right side of the transmission bell housing.


Possible Diagnostic Trouble Code Readout Electronic Transmission Control (ETC)
DTC 9 Control Valve Y3/1y2

REMEDY:
1. Remove transmission oil pan.





2. Inspect Control valve Y3/1y2, located in valve body lower cover (C, illustration):

- If valve Y3/1y2 is unpainted metal, reassemble transmission.
- If valve Y3/1y2 is painted black (vendor HYDRORING), replace control valve Y3/1y2 with unpainted metal version.

NOTE: Also refer to Transmission Does Not Engage 4TH Gear. Does Not Engage 4th Gear