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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1159 (Manual Transmission - AISIN AY6) >> Diagnostic Information and Procedures >> Transmission Does Not Shift into One Gear >> Test Description

Test Description

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. 2:  This step is to confirm that the clutch is not slipping. During certain conditions, the clutch may slip, and feel as though the transmission is not in gear.
  2. 3:  A static shift test is performed by shifting into all gears with the engine not operating. While performing the test, you should note how the shift lever movement feels. Also, feel for the shift rails moving freely, the detent plungers operating when coming out of a gear and going in the next gear, and the synchronizer sleeve movement.
  3. 5:  A dynamic shift test is performed by shifting into all gears with the engine operating. Test for the correct mesh of the synchronizers sleeve and the speed gear selector teeth. Move the shift lever and feel for the synchronizer sleeve to just release from the gear, then let up on the clutch pedal. Depress the clutch pedal and move the shift lever to re-engage that gear, to ensure full travel of the shift components.
Step Action Yes No
DEFINITION: The shift lever will not move into a particular gear position, or when it is in a gear position, power is not delivered through the transmission.
1 Did you review the Symptoms - Manual Transmission, and perform the necessary inspections? Go to Step 2  Go to Symptoms - Manual Transmission 
2  Inspect the clutch system for slipping. Refer to Clutch Slipping .
Is the clutch working properly?		 Go to Step 3  Go to Clutch Assembly Replacement
3 
  1. Perform a static shift test on the transmission.
  2. Test for the following:
    • Blockage preventing full shift lever movement
    • Excessive movement in the shift lever
    • Binding in the shift lever
    • Detent plungers or shift rails binding
    • Synchronizer sleeve movement
Were you able to shift into the gear position that has the concern?		 Go to Step 5  Go to Step 4 
4 Remove the shifter and inspect for worn or faulty components Refer to Transmission Control Replacement .
Did you find and repair the condition?		 Go to Step 7  Go to Step 5 
5 
  1. Perform a dynamic shift test on the transmission.
  2. Test for the following:
    • Detent plungers or shift rails binding
    • Synchronizer sleeve binding
    • Synchronizer sleeve engaging on the speed gear selector teeth
Were you able to shift into the gear position that has the concern?		 Go to Step 7  Go to Step 6 
6 Replace the transmission. Refer to Transmission Replacement .
Is the replacement complete?		 Go to Step 7  -
7 Operate the system in order to verify the repair.
Did you correct the condition?		 System OK Go to Step 1 
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