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Home >> Chevrolet >> 2018 >> Spark LT, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Manual Transmission - Y4A/Y4M) >> Diagnostic Information and Procedures >> Transmission Shifts Hard >> Test Description

Test Description

WARNING: This page is about a different variant/trim than selected.

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

  1. A static shift test is performed by shifting into all of the gear positions with the engine not operating. While performing the test one should note how the shift lever movement is felt. Also while shifting from one gear to the other feel for binding in the shift rails. You should be able to feel the detent plungers operating when coming out of a gear and going into a gear.

  2. A dynamic shift test is performed by shifting into the gear positions with the engine operating. Test for the correct mesh of the synchronizers and for the clutch releasing correctly. When shifting into and out of a gear, feel for the shift detent plungers and for the synchronizers sleeve for moving freely.

  3. The transmission uses a synthetic transmission fluid that allows proper synchronizer operation. The incorrect fluid may cause hard shifting by varnish build-up, or not enough lubrication for proper synchronizer operation.

Step Action Yes No
DEFINITION: The transmission does not shift smoothly, or without difficulty, from one gear to the other.
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 proper operation. Refer to Clutch System Description and Operation .
Did you find or repair the condition?
Go to Step 12  Go to Step 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
    • Shift & Select cable movement inspection
    • Shift cable proper adjustment
Are you able to shift into all gears?
Go to Step 6  Go to Step 4 
4
  1. Remove the floor console. Refer to Front Floor Console Replacement .
  2. Inspect for the following:
    • Loose mounting
    • Foreign debris
Did you find and repair the condition?
Go to Step 12  Go to Step 5 
5 Inspect for proper shift & select cable movement. Refer to Manual Transmission Shift Lever and Selector Lever Cable Movement Inspection .
Did you find and repair the condition?
Go to Step 12  Go to Step 6 
  1. Perform a dynamic shift test on the transmission.
  2. Test for the following:
    • Detent plungers or shift rails binding
    • Synchronizer sleeve binding
    • Gear clash into only one gear
    • Gear clash into all gears
Did the transmission shift hard into all gears?
Go to Step 7  Go to Step 11 
7 Inspect the transmission for the correct fluid level and type of the transmission fluid. Refer to Transmission Fluid Drain and Fill .
Is the transmission at the correct level and the proper fluid being used?
Go to Step 9  Go to Step 8 
Drain and refill the transmission with the correct type fluid. Refer to Transmission Fluid Drain and Fill .
Did you find and repair the condition?
Go to Step 12  Go to Step 9 
9
  1. Remove the transmission. Refer to Transmission Replacement (With 1.0L Engine) Transmission Replacement (With 1.4L Engine) .
  2. Inspect the clutch pressure plate and/or clutch driven plate.
Is the clutch pressure plate and/or clutch driven plate worn or faulty?
Go to Step 10  Go to Step 11 
10 Replace the clutch assembly. Refer to Clutch Pressure and Driven Plate Replacement .
Did you find and repair the condition?
Go to Step 12  Go to Step 11 
11 Replace the Transmission. Refer to Transmission Replacement (With 1.0L Engine) Transmission Replacement (With 1.4L Engine) .
Did you find and repair the condition?
Go to Step 12  Go to Diagnostic Aids
12 Operate the system in order to verify the repair.
Did you correct the condition?
System OK Go to Step 1