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Home >> Chevrolet >> 2005 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different car >> Section 680 (Automatic Transaxle - 4T65-E - Removal & Installation, Service, Overhaul, Troubleshooting & Diagnosis) >> Diagnostic Information And Procedures >> Automatic Transmission Symptoms >> No Engine Braking in Manual Ranges (Touch Activated Power)

No Engine Braking in Manual Ranges (Touch Activated Power)

WARNING: This page is about a different car, the 2008 Buick Lucerne. However, it is still accessible from the selected car via links, so may be relevant.
Checks Cause
DEFINITION: A large engine RPM increase and forward vehicle speed decrease do not immediately occur when the transmission is shifted from Drive to manual ranges or a coast condition occurs in any manual range.
Accumulator and Manual 2-1 Band Servo Assembly
  • A loose or damaged manual 2-1 band servo oil pipe (125)
  • Loose manual 2-1 band servo cover or accumulator cover bolts (103, 131)
  • A damaged accumulator cover spacer plate assembly (134)
  • A damaged or missing servo piston seal (107) or a servo piston cylinder O-ring seal (113)
  • A missing servo exhaust screen assembly (115), allowing debris into the cylinder
  • A misassembled manual 2-1 servo assembly (103-115)
Manual 2-1 Band Assembly
  • A band assembly (680) that is worn or burned
  • A band assembly (680) that is disengaged from the anchor pin (102)
  • A band anchor pin (102) that is loose or missing
Low Regulator Valve Valve stuck or missing spring
1-2 Shift Solenoid Valve stuck OFF
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