Hummer H3. Manual — part 1460

SYMPTOMS - MANUAL TRANSMISSION

Strategy Based Diagnostics

Review the system operations in order to familiarize yourself with the system functions. Refer to
Transmission System Description and Operation.

Visual/Physical Inspection

Inspect the easily accessible or visible system components for obvious damage or conditions
which could cause the symptom.

13

Vehicle Speed Sensor
Replacement.
Did you complete the
replacement?

-

Go to Step 15

-

14

Replace the PCM. Refer to
Control Module References
for replacement, setup and
programming.
Did you complete the
replacement?

-

Go to Step 15

-

15

Perform the following procedure
in order to verify the repair:

1. Select DTC.

2. Select Clear Info.

3. Test drive the vehicle.

4. Select Specific DTC.

5. Enter DTC P0503.

Has the test run and passed?

-

Go to Step 16 Go to Step 2

16

With the scan tool, observe the
stored information, capture info
and DTC info.
Does the scan tool display any
DTCs that you have not
diagnosed?

-

Go to
Diagnostic
Trouble Code
(DTC) List -
Vehicle

System OK

2007 Hummer H3

2007 TRANSMISSION Manual Transmission - Aisin AR5 - H3

Inspect the manual transmission for the correct fluid level.

Inspect the manual transmission for fluid leaks.

Inspect the manual transmission for broken or loose transmission mounts.

Intermittent

Test the vehicle under the same conditions that the customer reported in order to verify the system
is operating properly.

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the
symptom:

Transmission Shifts Hard

Transmission Gear Clash When Shifting Gears

Transmission Noisy

Transmission Does Not Shift into One Gear

Transmission Jumps Out of Gear

Transmission Locked in One Gear

Transmission Clunk on Acceleration or Deceleration

Transmission Fluid Leak Diagnosis

TRANSMISSION SHIFTS HARD

Diagnostic Aids

An intermittent hard shift may be caused by an intermittent clutch condition.

Test Description

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

3: A static shift test is performed by shifting into all of the gear positions with the engine not
operating. While performing the test, you should note how the shift lever movement is felt.
Also, while shifting from one gear to another, 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.

5: A dynamic shift test is performed by shifting into the gear positions with the engine

2007 Hummer H3

2007 TRANSMISSION Manual Transmission - Aisin AR5 - H3

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.

7: The transmission uses a special 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.

Transmission Shifts Hard

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 11

Go to Step 3

3

1. Perform a static shift test on the

transmission.

2. Test for the following conditions:

Blockage, preventing full shift
lever movement

Excessive movement in the shift
lever

Binding in the shift lever

Detent plungers or shift rails
binding

Are you able to shift into all gears?

Go to Step 5

Go to Step 4

4

Remove the shift control housing and
inspect for worn or faulty components.
Refer to Control Lever and/or Boot
Replacement.
Did you find and repair the condition?

Go to Step 11

Go to Step 5

1. Perform a dynamic shift test on the

transmission.

2007 Hummer H3

2007 TRANSMISSION Manual Transmission - Aisin AR5 - H3

5

2. Test for the following conditions:

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 6

Go to Step 10

6

Inspect the transmission for the correct fluid
level and type of transmission fluid. Refer to
Transmission Fluid Replacement.
Is the transmission fluid at the correct level
and the proper fluid being used?

Go to Step 8

Go to Step 7

7

Drain and fill the transmission with the
correct type of fluid. Refer to
Transmission Fluid Replacement.
Did you find and repair the condition?

Go to Step 11

Go to Step 8

8

1. Remove the transmission. Refer to

Transmission Replacement.

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 9

Go to Step 10

9

Replace the clutch assembly. Refer to
Clutch Assembly Replacement .
Did you find and repair the condition?

Go to Step 11

Go to Step 10

1. Disassemble the transmission. Refer to

Transmission Disassemble.

2. Inspect the following components for

being faulty, in the gear that is hard to
shift or clashing:

Excessive synchronizers blocking
ring to gear clearance

Synchronizer hub external

2007 Hummer H3

2007 TRANSMISSION Manual Transmission - Aisin AR5 - H3