Download TRANSAXLE – CD4E – HARSH AND DELAYED 1-2/2-3 UPSHIFTS – AFTER TRANSAXLE OR TURBINE SHAFT SPEED SENSOR (TSS) REPLACEMENT – POSSIBLE DIAGNOSTIC TROUBLE CODES (DTC) 628, 642, 645, 646, 647, 648, P0731, P0732, P0734, P0741, AND P1744 ISSUE Some vehicles equipped with the CD4E transaxle may exhibit harsh and delayed 1-2/2-3 upshifts along with DTCs for gear ratio errors after the Transaxle or Turbine Shaft Speed sensor (TSS) have been replaced. DTCs may include OBD1 codes 628, 642, 645, 646, 647, 648, or OBD II codes P0731, P0732, P0734, P0741, and P1744 ACTION If the condition occurred after servicing the Transaxle or TSS, refer to the following TSS Selection Chart and select the correct TSS for the vehicle application. Note that each TSS has the Ford engineering part number on it. Also note that there is a TSS kit that includes an instruction sheet, TSS sensor and correct bolt. SERVICE PROCEDURE If the condition occurred after replacing the Transaxle or TSS, use the TSS Selection Chart and determine the correct sensor for the vehicle.