GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Isuzu 🢒 2002 🢒 Isuzu T-Series (Truck Line C) 🢒 Transmission/Transaxle 🢒 Manual Transmission - Isuzu MLD6Q 🢒 Transmission Locked in One Gear

Test Description

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

  1. 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 components are not excessively worn or damaged.

    2.

  2. 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 manual transmission symptom and perform the necessary inspections?

Go to Step 2

Go to Symptoms - Manual Transmission

2

Inspect for the correct type transmission fluid. Refer to Lubrication Specifications .

Is the correct type transmission fluid being used?

Go to Step 4

Go to Step 3

3

Drain and refill the transmission with the correct type fluid. Refer to Transmission Oil Changing .

Did you find and repair the condition?

Go to Step 10

Go to Step 4

4

  1. Perform a static shift test on the transmission.
  2. Test for the shift lever moving into all gear positions.

Were you able to shift into all positions?

Go to Step 6

Go to Step 5

5

Inspect the following shift components for the proper operation:

    • Shift lever
    • Shift cables
    • Shift control and shift control linkage

Did you find and repair the conditions?

Go to Step 10

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 8

Go to Step 7

7

Remove the shift cover. Refer to Transmission Disassemble .

Inspect the shift cover for worn or damaged components.

    • Internal shift levers
    • Shift rails and bushings
    • Shift forks

Did you find and repair the condition?

Go to Step 10

Go to Step 8

8
  1. Remove the transmission. Refer to Transmission Replacement .
  2. Inspect the clutch system for the clutch not releasing properly. Refer to Clutch System Description and Operation in Clutch.

Did you find and repair the condition?

Go to Step 10

Go to Step 9

9

  1. Disassemble the transmission. Refer to Transmission Disassemble .
  2. Inspect the following transmission internal components for wear or damage:
    • 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

Go to Diagnostic Aids

10

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 1