A/T - Harsh/Erratic Shifts/No Gear, Multiple Codes: Overview
BULLETIN NO.: 93-T-22AISSUE DATE: March, 1994
GROUP/SEQ. NO.: Transaxle-01
CORPORATION NO.: 387101R
TECHNICAL INFORMATION BULLETIN
SUBJECT:
Harsh and/or Erratic Shifts, No Gear or Gear Stuck On, and Multiple PCM/TC Codes arc Set - MP6/MP7 Automatic Transaxles (Replace Stuck Transaxle Control Actuator Valve)
Due to the addition of 1994 vehicles, extensive changes in procedures and the addition of PCM/TC codes 21 and 75, this bulletin supercedes bulletin 93-T-22, which should be discarded.
MODELS AFFECTED:
1993 and 1994 Saturn Sedans, Coupes and Wagons equipped with MP6 or MP7 automatic transaxles.
CONDITION:
Some automatic transaxles may have harsh and/or erratic shifts, no gear or gear stuck on, and the malfunction indicator lamp (MIL) (SERVICE ENGINE SOON telltale lamp) may come on, and multiple diagnostic trouble codes (21, 22, 23, 24, 25, 75, and 78) may be stored in the PCM/TC.
CAUSE:
Some automatic transaxles may have been manufactured with iron sediment that migrates to the control valve body assembly causing transaxle control actuator valves to seize and or the valves in the control valve assembly to stick or be sluggish to move.
CORRECTION:
Refer to the procedures section of this bulletin to diagnose and repair the transaxle.