GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2005 🢒 Cobalt 🢒 Transmission/Transaxle 🢒 Manual Transaxle - MU3 🢒 Transmission Locked in One Gear

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. This step is to ensure the use of the proper transaxle fluid. A special fluid is used to ensure proper synchronizer operation, and for sufficient lubrication. Improper fluid may cause the synchronizers to stick or the transaxle components to overheat.

    2.

  2. A static shift test is performed by shifting into all gears with the engine not operating. By confirming that the transaxle can be shifted into all positions, ensures that the shift lever is not excessively worn or damaged.

    3.

  3. A dynamic shift test is performed by shifting into all of the gear positions with the engine operating. Test to ensure that the internal shift components are functioning properly.

Step

Action

Yes

No

DEFINITION: The transaxle cannot be shifted out of a gear, or the vehicle will not move because the transaxle is locked.

1

Did you review the Symptoms - Manual Transmission and perform the necessary inspections?

Go to Step 2

Go to Symptoms - Manual Transmission

2

Inspect for the correct type of transaxle fluid.

Is the correct type transaxle fluid being used?

Go to Step 4

Go to Step 3

3

Drain the transaxle, and refill with the correct type of fluid. Refer to Transmission Fluid Replacement .

Did you find and repair the condition?

Go to Step 9

Go to Step 4

4

  1. Perform a static shift test on the transaxle.
  2. Test for the shift lever moving to all positions.

Were you able to shift into all positions?

Go to Step 6

Go to Step 5

5
  1. Remove the shift lever.
  2. Inspect for worn or faulty components. Refer to Shift Control Assembly Replacement .

Did you find and repair the conditions?

Go to Step 9

Go to Step 6

6

  1. Perform a dynamic shift test on the transaxle.
  2. Test for being able to shift in and out of the gear with the concern.

Were you able to shift the transaxle correctly?

Go to Step 7

Go to Step 8

7
  1. Remove the transaxle. Refer to Transmission Replacement .
  2. Inspect the clutch system for the clutch not releasing properly. Refer to Clutch System Description and Operation .

Did you find and repair the condition?

Go to Step 9

Go to Step 8

8

  1. Disassemble the transaxle. Refer to Transmission Disassemble .
  2. Inspect the following transaxle internal components for wear or damage:
    3. • The shift rail
    • The internal shift control lever
    • The synchronizer components for being broken or faulty
    • The speed gears for being seized to the mainshaft

Did you find and repair the conditions?

Go to Step 9

--

9

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 1