Circuit/System Testing

WARNING: This page is about a different car, the 2010 Pontiac G5 and 2010 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.

Perform the Transmission Fluid Level and Condition Check .
- If the level is not within specifications, repair as necessary.
Perform the Line Pressure Check .
- If the pressures are not within specifications, inspect and repair the following components:
  - Oil filter and seal missing, plugged, or damaged-refer to Automatic Transmission Fluid Filter and Seal Replacement .
  - Spacer plate and gasket damage or misassembled-refer to Control Valve Body Assemble .
  - PC solenoid valve damaged or contaminated
  - Pressure regulator valve line-up binding or damaged
  - Torque signal valve line-up binding or damaged-refer to Control Valve Body Disassemble .
  - Oil pump assembly damaged or missing components-refer to Oil Pump Cleaning and Inspection .
Using the scan tool observe the shift times for the 1-2 upshift. The 1-2 shift time should be less than 0.65 seconds.
- If the shift time is above 0.65 seconds, inspect and repair the following components:
  - Leaking 1-2 accumulator piston seals
  - Rolled 1-2 accumulator piston seals
  - Cut 1-2 accumulator piston seals
    Refer to Channel Plate Assembly Disassemble .
  - Leaking 2nd clutch piston seals
  - Rolled 2nd clutch piston seals
  - Cut 2nd clutch piston seals
  - Burned 2nd clutch plates
  - Damaged 2nd clutch plates
  - Broken 2nd clutch springs
  - Out-of-position 2nd clutch springs
  - Damaged 2nd clutch piston
  - Cracked or damaged driven sprocket support
  - Leaking driven sprocket support seals
  - Damaged driven sprocket support seals
    Refer to Driven Sprocket Support Assembly Disassemble .
  - Internal fluid passage leaks
  - Casting porosity or damage
    Refer to Case Inspection .
  - Damaged gasket or spacer plate
  - Out-of-position gasket or spacer plate
    Refer to Control Valve Body Disassemble .
  - Slipping forward clutch
  - Damaged sprag clutch, not holding
    Refer to Direct/Coast Clutch, Reaction Carrier Disassemble .
  - 2nd roller clutch damaged, not holding
    Refer to Reverse Input and Second Roller Clutch Disassemble .
Using the scan tool observe the shift times for the 2-3 upshift. The 2-3 shift time should be less than 0.65 seconds.
- If the 2-3 shift time is above 0.65 seconds, inspect and repair the following components:
  - Leaking 2-3 accumulator piston seals
  - Rolled 2-3 accumulator piston seals
  - Cut 2-3 accumulator piston seals
    Refer to Channel Plate Assembly Disassemble .
  - Leaking direct clutch piston seals
  - Rolled direct clutch piston seals
  - Cut direct clutch piston seals
  - Burned direct clutch plates
  - Damaged direct clutch plates
  - Broken direct clutch springs
  - Out-of-position direct clutch springs
  - Damaged direct clutch pistons
  - Damaged, or not holding, sprag clutch
    Refer to Direct/Coast Clutch, Reaction Carrier Disassemble .
  - Leaking driven sprocket support seals
  - Damaged driven sprocket support seals
  - Damaged driven sprocket support
    Refer to Driven Sprocket Support Assembly Disassemble .
  - Internal fluid passage leaks
  - Casting porosity or damage
    Refer to Case Inspection .
  - Damaged gasket or spacer plate
  - Out-of-position gasket or spacer plate
    Refer to Control Valve Body Disassemble .
Using the scan tool observe the shift times for the 3-4 upshift. The 3-4 shift time should be less than 0.65 seconds.
- If the 3-4 shift time is above 0.65 seconds, inspect and repair the following components:
  - Leaking 3-4 accumulator piston seals
  - Rolled 3-4 accumulator piston seals
  - Cut 3-4 accumulator piston seals
    Refer to Channel Plate Assembly Disassemble .
  - Leaking intermediate/4th servo piston seals
  - Rolled intermediate/4th servo piston seals
  - Cut intermediate/4th servo piston seals
  - Damaged intermediate/4th servo pin
  - Seized intermediate/4th servo pin
  - Damaged intermediate/4th servo piston
  - Cracked intermediate/4th servo cover
  - Leaking intermediate/4th servo cover
    Refer to Intermediate/Fourth Servo Disassemble .
  - Burned intermediate/4th band
  - Out-of-position intermediate/4th band
  - Damaged intermediate/4th band
  - Slipping intermediate/4th band
    Refer to Intermediate Fourth Band Removal .
  - Internal fluid passage leaks
  - Casting porosity or damage
    Refer to Case Inspection .
  - Damaged gasket or spacer plate
  - Out-of-position gasket or spacer plate
    Refer to Control Valve Body Disassemble .
  - Slipping direct clutch
    Refer to Direct/Coast Clutch, Reaction Carrier Disassemble .
Change the AT fluid and filter. Add new AT fluid, refer to Transmission Fluid Level and Condition Check .
- If the fluid is not at the proper level, add as necessary.

IMPORTANT: The Reset Transmission Adapts function will clear all adapt cells. This may affect transmission performance. The TCM will update the transmission adapt cell values as the vehicle is driven

Perform the Transmission Adapts function.