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Home >> Chevrolet >> 2006 >> Cobalt LTZ >> Repair and Diagnosis >> External Pages >> Different car >> Section 754 (Automatic Transaxle - 4T45-E - Removal & Installation, Service, Overhaul, Troubleshooting & Diagnosis) >> Diagnostic Information and Procedures >> Road Test >> Manual Downshifts

Manual Downshifts

WARNING: This page is about a different car, the 2008 Pontiac G5 and 2008 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.

The shift solenoid valves do not control the 4-3 manual downshift. The 4-3 manual downshift is hydraulic. The 3-2 and 2-1 manual downshifts are electronic. The solenoid states will change during, or shortly after a 4-3 downshift is selected.

Manual 4-3 Downshift

  1. Place the gear selector in the OVERDRIVE position.
  2. Accelerate the vehicle to 64-88 km/h (40-55 mph) in FOURTH gear.
  3. Release the throttle while moving the gear selector to THIRD.
  4. Verify the following:
    • The TCC releases
    • The transmission downshifts immediately to THIRD gear
    • The engine slows the vehicle

Manual 4-2 Downshift

  1. Place the gear selector in the OVERDRIVE position.
  2. Accelerate the vehicle to 64-72 km/h (40-45 mph).
  3. Release the throttle while moving the gear selector to SECOND.
  4. Verify the following:
    • The TCC releases
    • The transmission downshifts immediately to SECOND gear
    • The engine slows the vehicle

Manual 4-1 Downshift

  1. Place the gear selector in the OVERDRIVE position.
  2. Accelerate the vehicle to 64 km/h (40 mph).
  3. Release the throttle while moving the gear selector to FIRST.
  4. Verify the following:
    • The TCC releases
    • The transmission immediately downshifts to SECOND Gear.
    • The engine slows the vehicle.
    • The transmission downshifts to FIRST gear at the calibrated speed, typically 48-64 km/h (30-40 mph).
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