Hummer H3. Manual — part 719

1. Start the engine and locate the transmission dipstick at the rear of the engine compartment,

on the passenger side of the vehicle.

2. Flip the handle up and then pull out the dipstick and wipe the dipstick end with a clean rag

or paper towel.

3. Install the dipstick by pushing it back in the dipstick tube all the way, wait three seconds

and then pull it back out.

4. Keep the dipstick tip pointing down and check both sides of the dipstick. Read the lower

level. Repeat the check procedure to verify the reading.

5. Inspect the color of the fluid on the dipstick. Refer to Fluid Condition Inspection.

6. A safe operating fluid level is within the HOT crosshatch band on the dipstick. If the fluid

level is not within the HOT band and the transmission temperature is between 82-93°C
(180-200°F), add or drain fluid as necessary to bring the level into the HOT band. If the
fluid level is low, add only enough fluid to bring the level into the HOT band.

7. If the fluid level is low, add only enough fluid to bring the level into the HOT band. It does

not take much fluid, generally less than one pint (0.5L). Do not overfill. Also, if the fluid
level is low, inspect the transmission for leaks. Refer to Fluid Leak Diagnosis.

8. If the fluid level is in the acceptable range, push the dipstick back into the dipstick tube all

the way and then flip the handle down to lock the dipstick in place.

9. If applicable and if the vehicle is equipped, reset the transmission oil life monitor only if the

fluid was changed.

Fluid Condition Inspection

Inspect the fluid color. The fluid should be red or dark brown.

rises as fluid temperature increases, so it is important to
ensure the transmission temperature is within range.

IMPORTANT: Always check the fluid level at least twice. Consistent

readings are important to maintaining proper fluid level. If
inconsistent readings are noted, inspect the transmission
vent assembly to ensure it is clean and unclogged.

IMPORTANT: To assist in reaching the correct temperature range of 82-93°

C (180-200°F), drive the vehicle in second gear at no more
than 65 mph until the desired temperature is reached.

2007 Hummer H3

2007 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - H3

If the fluid color is very dark or black and has a burnt odor, inspect the fluid and inside of
the bottom pan for excessive metal particles or other debris. A small amount of "friction"
material in the bottom pan is a "normal" condition. If large pieces and/or metal particles are
noted in the fluid or bottom pan, flush the oil cooler and cooler lines and overhaul the
transmission. If there are no signs of transmission internal damage noted, replace the fluid
filter assembly, repair the oil cooler and flush the cooler lines.

Fluid that is cloudy or milky or appears to be contaminated with water indicates engine
coolant or water contamination. Refer to Engine Coolant/Water in Transmission.

LINE PRESSURE CHECK

Fig. 2: Using Pressure Gage To Test Line Pressure
Courtesy of GENERAL MOTORS CORP.

Tools Required

J 21867 Pressure Gage

Check Procedure

CAUTION: Keep the brakes applied at all times in order to prevent

2007 Hummer H3

2007 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - H3

1. Install a scan tool.

2. Start the engine.

3. Inspect the transmission for the proper fluid levels. Refer to Transmission Fluid Check.

4. Use the scan tool to inspect for any active or stored diagnostic trouble codes.

5. Inspect the manual linkage at the transmission for proper function.

6. Turn the engine OFF.

7. Remove the pressure plug.

8. Install the J 21867 .

9. Access the Scan Tool Output Control for the PC Solenoid.

10. Start the engine.

11. Begin commanding PC Solenoid at 1.0 amp and lower the amperage in one-tenth increments

(0.01) until maximum line pressure is achieved.

12. Allow the pressure to stabilize between increments.

13. Compare your pressure readings to the Line Pressure table. Refer to Line Pressure .

unexpected vehicle motion. Personal injury may result if
the vehicle moves unexpectedly.

IMPORTANT: Before performing the line pressure check, verify that the

transmission pressure control (PC) solenoid is operating
correctly.

IMPORTANT: It may be necessary to remove or disconnect components in

order to gain access to the transmission line pressure test
port/plug.

IMPORTANT: In order to achieve accurate line pressure readings, the

following procedure must be performed at least three times
in order to gather uniform pressure readings.
The scan tool is only able to control the PC solenoid in PARK
and NEUTRAL with engine speeds below 1500 RPM. This
protects the clutches from extreme high or low line
pressures.
This test must be preformed at 1200 RPM, between 38-93°C
(100-200°F).

2007 Hummer H3

2007 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - H3

14. If the pressure readings vary greatly from the line pressure table, refer to Oil Pressure

High or Low.

15. Turn the engine OFF.

16. Remove the J 21867 .

17. Install the pressure plug.

Tighten: Tighten the pressure plug to 8-14 N.m (6-10 lb ft).

ROAD TEST

The following test provides a method of evaluating the condition of the automatic transmission.
The test is structured so that most driving conditions would be achieved. The test is divided into
the following parts:

Electrical Function Check

Upshift Control and Torque Converter Clutch (TCC) Apply

Part Throttle Detent Downshifts

Full Throttle Detent Downshifts

Manual Downshifts

Coasting Downshifts

Manual Gear Range Selection

REVERSE

Manual FIRST

Manual SECOND

Manual THIRD

Before the road test, ensure the following:

NOTE:

Refer to Fastener Notice .

IMPORTANT: The Road Test Procedure should be performed only as part of the

Symptom Diagnosis. Refer to Symptoms - Automatic
Transmission.

IMPORTANT: Complete the test in the sequence given. Incomplete testing

cannot guarantee an accurate evaluation.

2007 Hummer H3

2007 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - H3