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Home >> Pontiac >> 2003 >> Vibe Base, AWD >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission - Mu5 >> Diagnostic Information and Procedures >> Road Test Procedure >> Manual Downshift Test

Manual Downshift Test

  1. Move the manual selector to the Drive (D) selector.
  2. Operate the vehicle at 64-88 km/h (40-55 mph) and the Overdrive switch pressed.
  3. Release the accelerator pedal and the Overdrive Switch.
  4. Verify the following operating conditions:
    • The Torque Converter Clutch (TCC) releases.
    • The transaxle downshifts immediately to third gear.
    • The engine reduces the vehicles speed.
  5. Operate the vehicle at 48 km/h (30 mph).
  6. Release the accelerator pedal.
  7. Move the manual selector to the Second (2) range
  8. Verify the following operating conditions:
    • The TCC at 24 km/h (15 mph).
    • The transaxle downshifts immediately to second gear.
    • The engine reduces the vehicles speed.
    • Manual 2nd to low shift.
  9. Move the manual selector to the Drive (D) selector.
  10. Operate the vehicle at 24 km/h (15 mph).
  11. Release the accelerator pedal.
  12. Move the manual selector to the Low (L) range.
  13. Verify the following operating conditions:
    • The TCC releases.
    • The transaxle downshifts immediately to first gear.
    • The engine reduces the vehicles speed.
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