A/T - Engine Flares/Loss of Power/Harsh Shifts

BULLETIN NO.: 94-T-42

ISSUE DATE: October, 1994

GROUP/SEQ. NO.: Transaxle-05

CORPORATION NO.: 487104

TECHNICAL INFORMATION BULLETIN

SUBJECT:
Intermittent Engine Flares, Loss of Power and/or Harsh Shifts, PCM/TC Diagnostic Trouble Codes 22, 23, 24 and/or 26 MP6/MP7 Automatic Transaxles (Replace Intermittently Sticking Transaxle Control Actuator Valve)

MODELS AFFECTED:
1995 Saturns equipped with MP6 or MP7 automatic transaxles

CONDITION:
Some customers may comment of intermittent engine flares, loss of power and/or harsh shifts and the 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), DTC 24 (no 4th gear) or DTC 26 (TCC stuck On). DTCs are set when automatic transaxle fluid temperatures are approximately 90~C (194~F) or higher.

CAUSE:
These conditions may be caused by internal components of the automatic transaxle control actuator valve that stick.

CORRECTION:
Perform the following procedure to repair the concern.

PROCEDURE:

1. Check malfunction history and determine the temperature range of the occurrences to duplicate the fault.

2. Follow the procedures in the "Automatic Transaxle Service Manual" corresponding to the appropriate diagnostic trouble code(s).

3. If you find no problems after performing the diagnostics in the diagnostic tree chart(s), replace the transaxle control actuator valve corresponding to the diagnostic trouble code.

4. Verify the repairs by road testing the vehicle at the temperature the diagnostic trouble code(s) were set at, before repairs were completed.

IMPORTANT:
Intermittent diagnostic trouble codes 22, 23, 24 and/or 26 are usually due to an internal clearance condition in the automatic transaxle control actuator valve and not the result of iron sediment in the automatic transaxle valvebody. Normally, sticking automatic transaxle control actuator valves do not cause clutch failures.

PARTS REQUIREMENTS:
21002509 Valve-Trans Control Actuator (Color Coded Red)

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.