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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 117 (Manual Transmission - TREMEC 6-Speed (Mg9) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> Transmission Locked in One Gear >> Test Description

Test Description

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

  1. 2 

    This step is to ensure the use of the proper transmission fluid. The transmission fluid is used to ensure proper synchronizer operation, and for sufficient lubrication. Improper fluid may cause the synchronizers to stick or cause overheating of the transmission components.

  2. 4 

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

  3. 6 

    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 properly functioning.

Step Action Yes No
DEFINITION: The transmission cannot be shifted out of a gear or the vehicle will not move because the transmission 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 transmission fluid. Approximate Fluid Capacities
Is the correct type of transmission fluid being used?		 Go to Step 6  Go to Step 5 
3 Drain and fill the transmission with the correct type of fluid. Transmission Fluid Drain and Fill
Did you find and repair the condition?		 Go to Step 9  Go to Step 6 
4 
  1. Perform a static shift test on the transmission.
  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. Manual Transmission Control Replacement
  2. Inspect for worn or faulty components.
Did you find and repair the conditions?		 Go to Step 9  Go to Step 6 
6 
  1. Perform a dynamic shift test on the transmission.
  2. Test for being able to shift in and out of the gear with the concern.
Were you able to shift the transmission correctly?		 Go to Step 7  Go to Step 8 
7
  1. Remove the transmission. Manual Transmission Removal and Installation
  2. Inspect the clutch system for the clutch not releasing properly. Clutch System Description and Operation
Did you find and repair the condition?		 Go to Step 9  Go to Step 8 
8
  1. Disassemble the transmission. Transmission Disassemble
  2. Inspect the following transmission internal components for wear or damage:
  • 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
  • The shift turret rail
Did you find and repair the conditions?		 Go to Step 9  Go to Diagnostic Aids
9 Operate the system in order to verify the repair.
Did you correct the condition?		 System OK Go to Step 1 
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