Coupe L4-1.9L DOHC VIN 7 (1994)
Technical Service Bulletin # 93-T-22A
Date: 940301
A/T - Harsh/Erratic Shifts/No Gear, Multiple Codes
BULLETIN NO.: 93-T-22A
ISSUE 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.
Procedures
1.
Record the PCM/TC diagnostic trouble codes and "Slip Monitor" values.
IMPORTANT:
Prior to disconnecting the battery, the "Slip Monitor" values must be recorded.
2.
Verify if the transaxle is stuck in a forward gear. Connect the Scan tool and observe the automatic transaxle turbine speed while performing the
following:
NOTICE:
When verifying if the transaxle is stuck in a forward gear, move the vehicle to an unrestricted area where vehicle maneuvers can be made
without interruption. During this evaluation, as always, apply the brakes before shifting between gears.
^
Shift the transaxle into Reverse. If the vehicle will not move and the automatic transaxle turbine speed reads 0 rpm, the transaxle is stuck in a
forward gear. Internal damage to the transaxle has occurred and a complete transaxle overhaul must be performed. Refer to the "Internal
Inspection Procedure" in this bulletin.
^
While applying the brakes, shift the transaxle into Neutral. If the automatic transaxle turbine speed reads 0 rpm, the transaxle is stuck in a
forward gear. Internal damage to the transaxle has occurred and a complete transaxle overhaul must be performed. Refer to the "Internal
Inspection Procedure" in this bulletin.
3.
Test drive the vehicle to verify the complaint.
