Automatic Transmission - MU4: Specifications Pontiac Vibe I

Fastener Tightening Specifications

FASTENER TIGHTENING SPECIFICATIONS

Fluid Capacity Specifications

FLUID CAPACITY SPECIFICATIONS

Scheme 826

Upshifts and Torque Converter Clutch (TCC) Apply Test

1. Move the manual selector to the Drive (D) range.
2. Depress the Overdrive Switch.
3. Accelerate the vehicle using steadily increasing throttle pressure.
4. Note the vehicle speeds and the shift points for the following gears: Second gear (2) Third gear (3) Overdrive (4) Observe the vehicle speeds and the shift points at which the Torque Converter Clutch (TCC) engages. TCC apply should occur in 3rd gear.

Torque Converter Diagnosis Procedure

The torque converter clutch (TCC) is applied by fluid pressure, which is controlled by a solenoid valve. This solenoid valve is located inside of the automatic transmission assembly. The solenoid valve is controlled through a combination of computer controlled switches and sensors.

Torque Converter Stator

The torque converter stator roller clutch can have two different malfunctions.

1. The stator assembly freewheels in both directions.
2. The stator assembly remains locked up at all times.

Torque Converter Clutch Shudder

The key to diagnosing torque converter clutch (TCC) shudder is to note when it happens and under what conditions.

TCC shudder which is caused by the transmission should only occur during the apply or the release of the converter clutch. Shudder should never occur after the TCC plate is fully applied.

If the shudder occurs while the TCC is applying, the problem can be within the transmission or the torque converter. Something is causing one of the following conditions to occur

1. Something is not allowing the clutch to become fully engaged.
2. Something is not allowing the clutch to release.
3. The clutch is releasing and applying at the same time.

One of the following conditions may be causing the problem to occur

1. Leaking turbine shaft seals
2. A restricted release orifice
3. A distorted clutch or housing surface due to long converter bolts
4. Defective friction material on the TCC plate

Torque Converter Evaluation and Diagnosis

Replace the torque converter if any of the following conditions exist

1. External leaks appear in the hub weld area.
2. The converter hub is scored or damaged.
3. The converter pilot is broken, damaged, or fits poorly into the crankshaft.
4. You discover steel particles after flushing the cooler and the cooler lines.
5. The pump is damaged, or you discover steel particles in the converter.
6. The vehicle has TCC shudder and/or no TCC apply. Replace the torque converter only after all hydraulic and electrical diagnoses have been made. The converter clutch material may be glazed.
7. The converter has an imbalance which cannot be corrected. Refer to «FLEXPLATE/TORQUE CONVERTER VIBRATION TEST»(ref-204206-S04710393652005110900000) «TORQUE CONVERTER EVALUATION AND DIAGNOSIS»(ref-204206-S12211578472005110900000) .
8. The converter is contaminated with engine coolant which contains antifreeze.
9. An internal failure occurs in the stator roller clutch.
10. You notice excessive end play.
11. Overheating produces heavy debris in the clutch.
12. You discover steel particles or clutch lining material in the fluid filter or on the magnet, when no internal parts in the unit are worn or damaged. This condition indicates that lining material came from the converter.

Do not replace the torque converter if you discover any of the following symptoms

1. The oil has an odor or the oil is discolored, if there are no metal or clutch facing particles present.
2. The threads in one or more of the converter bolt holes are damaged. Correct the condition as necessary.
3. Transmission failure did not display evidence of damaged or worn internal parts, steel particles or clutch plate lining material in the unit and inside the fluid filter.
4. The vehicle has been exposed to high mileage only. An exception may exist where the lining of the torque converter clutch dampener plate has seen excess wear by vehicles operated in heavy and/or constant traffic, such as taxi, delivery, or police use.

Flexplate/Torque Converter Vibration Test

1. With the manual selector in P (park) position, start engine.
2. With engine at idle, note any abnormal vibration.
3. Move the manual selector to N (neutral) position and note any abnormal vibration.
4. Return the manual selector to P (park) position and turn ignition switch to the LOCK position.
5. Raise and suitably support the vehicle.
6. Remove the flywheel cover.
7. Remove the flywheel-to-torque converter bolts.
8. Rotate torque converter 120 degrees (1/3 turn).
9. Install the flywheel-to-torque converter bolts. Tighten Flywheel-to-torque converter bolts to 19N.m(14 lb ft).
10. Install flywheel cover.
11. Lower vehicle.
12. With the manual selector in P (park) position, start the engine.
13. If any abnormal vibration still exists, repeat this procedure until the best possible balance is obtained.