ION L4-2.2L VIN F (2004)
Control Module: All Technical Service Bulletins
A/T - Low Speed Grinding Noise Hesitation
Low Speed Grind Noise and/or Hesitation While Driving (Install New Transmission Control Module (TCM) Calibration and Add New Transmission
Fluid and Additive)
# 05-07-30-005 - (Mar 8, 2005)
Models:
2003-2004 Saturn ION Vehicles with VT25E (VTi) Transaxle (RPO M75)
Condition
Condition # 1:
Some customers may comment on a low speed grind noise that occurs at approximately 5-12 mph (8-19 km/h) during a vehicle coast down, during which
the driver's foot is off the accelerator. The customer may hear the same noise, for a short duration, when lightly applying the accelerator pedal within the
same vehicle speed range.
Condition # 2:
Some customers may comment that while driving on rough or slippery road surfaces such as bumps, railroad tracks, or while turning a corner, the
maneuver may result in vehicle hesitation.
Cause
Cause # 1:
The belt drive system is commanded to a ratio that causes a unique load on the drive belt, which generates belt noise during vehicle coast down and light
pedal apply transitions.
Cause # 2:
A fluctuating wheel speed may be recognized by the TCM as wheel slip. The TCM may inadvertently invoke a protection algorithm to minimize the
wheel slip and result in a temporary lack of power or perceived hesitation.
Correction
Install the appropriate new TCM calibration (refer to Calibration Information table in this bulletin). Drain and re-fill transaxle fluid two times using
DEX-CVT(R) fluid, P/N 15250985 - gallon, P/N 15234609 - quart. After the second consecutive drain and fill, add one unit (10 ml [0.33 fluid oz]
syringe) of DEX-CVT(R) additive, P/N 15231847.
The new calibration will not correct a grinding noise condition unless the new DEX-CVT(R) Fluid, P/N 15234609, and additive, P/N 15231847, is
incorporated in the repair process.
Service Procedure
1.
Determine current TCM calibration ID. number.
A.
Connect Tech 2(R) scan tool to the vehicle.
B.
Navigate to the 2.2L (VIN F) Powertrain Menu.
C.
Select ID information.
D.
Select TRANSMISSION INFORMATION.
E.
Read Calibration ID. and record this number for use in step 3.
Important:
Before installing new TCM calibration, make sure the Saturn Service Stall System (SSS) version is TIS 2.5 2005 or later.
2.
Program the TCM with new calibration. Refer to the calibration information table in this bulletin and select the appropriate TCM calibration for
the application. Use Saturn Service Stall (SSS) software release TIS 2.5 2005 or higher data CD. For reprogramming procedures, refer to the
Service Programming System (SPS) in the SSS Users Guide.
3.
Raise and support the vehicle. Refer to "Lifting and Jacking the Vehicle" in the General Information section of the appropriate Service Manual.
