A/T - Engine Flares/Loss of Power/Harsh Reverse Shift
BULLETIN NO.: 94-T-43ISSUE DATE: October, 1994
GROUP/SEQ. NO.: Transaxle-06
CORPORATION NO.: 487105
TECHNICAL INFORMATION BULLETIN
SUBJECT:
Repeatable Engine Flare, Loss of Performance, Delayed and/or Harsh Engagement into Reverse (Replace Damaged Piston Seal)
MODELS AFFECTED:
1995 Saturns equipped with MP6 or MP7 automatic transaxles
CONDITION:
Some customers may comment of a repeatable engine flare, loss of performance, delayed and/or harsh engagement into Reverse and malfunction indicator lamp (SERVICE ENGINE SOON telltale lamp) may be illuminated. Diagnostic trouble codes (DTCS) may also be stored in the PCM memory as a result of this condition.
These diagnostic trouble codes may be DTC 22 (no 2nd gear), DTC 23 (no 3rd gear) and/or DTC 24 (no 4th gear). DTCs may be set at any transaxle fluid temperature.
CAUSE:
These conditions may be caused by a piston seal that may have been damaged during automatic transaxle assembly.
CORRECTION:
When diagnosing diagnostic trouble codes 22, 23 or 24, follow the procedures in the "Automatic Transaxle Service Manual" corresponding to the appropriate diagnostic trouble code(s). When diagnosing a delayed and/or harsh engagement into reverse, with no DTC present, refer to the diagnostic chart in this bulletin.
IMPORTANT:
A delay and/or harsh engagement into Reverse may be caused by a small leak at the 2nd/Reverse piston seal which does not appear to cause any problem in the application of the second clutch. A no reverse condition may be caused by a large leak at the 2nd/Reverse piston seal. Damaged piston seals do not normally cause automatic transaxle clutch failures.
DELAY OR HARSH ENGAGEMENT INTO REVERSE
CLAIM INFORMATION:
To receive credit for this repair during the warranty coverage period, submit a claim through the Saturn Dealer System using the appropriate Labor Operation and Time for the work performed.