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DESCRIPTION:
This bulletin describes three (3) possible conditions which can exist when a vehicle, equipped with an automatic transaxle, will not engage overdrive (4th gear). The procedures listed below describe each of the conditions and the methods of diagnosing / repairing the vehicle.
DIAGNOSTIC PROCEDURES:
CONDITION 1:
Transaxle shifts properly through all other gears (1st, 2nd, 3rd) but slips in 4th gear:
DIAGNOSIS / REPAIR:
Disengage (turn-off) overdrive. If transaxle operates normally in 3rd gear proceed to the next step.
Road test the vehicle with the Automatic Transaxle Tester, SST # J39853, connected. Using the manual gear selector, command shifts 1st, 2nd, 3rd And 4th. If transaxle slips or fails to engage 4th gear, replace the end clutch.
If transaxle shifts normally through all gears and does not slip,
check the wiring and/or Transmission Control Module.
CONDITION 2:
Transaxle shifts properly through all other gears (1st, 2nd, 3rd) but will not engage 4th gear (remains in 3rd):
DIAGNOSIS / REPAIR:
Connect HDS Scan Tool SST # J41490 and turn ignition switch to "On" position. Select appropriate vehicle then select "Transaxle." From the "Codes and Data" menu, select "Data." Manually operate the overdrive switch and read "OD SW" on scan tool. If the overdrive switch is not working properly, replace the switch.
If by replacing the overdrive switch the condition is not corrected, check the wiring and/or Transmission Control Module.
CONDITION 3:
While driving at a steady speed in 4th gear the vehicle downshifts to 3rd or 2nd gear:
DIAGNOSIS / REPAIR:
Test the oil temperature sensor as indicated in TSB #'s96-40-001 or 96-40-009.If oil temperature sensor is not within specification, replace the sensor.
If by replacing the oil temperature sensor the condition is not corrected, check the wiring and/or Transmission Control Module.
