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Home >> Isuzu >> 2007 >> i-290 LS, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 72 (Automatic Transaxle - 4T80-E - Service, Diagnosis & Troubleshooting) >> Road Test >> Manual Downshifts

Manual Downshifts

WARNING: This page is about a different car, the 2007 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.

The shift solenoid valves do not control manual downshifts. Manual downshifts are hydraulic. The solenoid states will change during, or shortly after a manual 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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