Hummer H3. Manual — part 720

The engine is performing properly.

Transmission fluid level is correct. Refer to the Transmission Fluid Check.

Tire pressure is correct.

During the road test:

Perform the test only when traffic conditions permit.

Operate the vehicle in a controlled, safe manner.

Observe all traffic regulations.

View the scan tool data while conducting this test.

Take along qualified help in order to operate the vehicle safely.

Observe any unusual sounds or smells.

After the road test, check the following:

Transmission fluid level-Refer to the Transmission Fluid Check.

Diagnostic trouble codes (DTCs) that may have set during the testing-Refer to the
applicable DTC.

Scan tool data for any abnormal readings or data.

Electrical Function Check

Perform this check first, in order to ensure the electronic transmission components are connected
and functioning properly. If these components are not checked, a simple electrical condition
could be mis-diagnosed.

1. Connect the scan tool.

2. Ensure the gear selector is in PARK and set the parking brake.

3. Start the engine.

4. Verify that the following scan tool data can be obtained and is functioning properly.

Refer to Scan Tool Data List for typical data values. Data that is questionable may
indicate a concern.

Engine speed

Transmission output speed

2007 Hummer H3

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

Transmission input speed - some models

Vehicle speed

TFP manual valve position switch

Transmission range

Commanded gear

PC solenoid reference current

PC solenoid actual current

PC solenoid duty cycle

Engine coolant temperature

Transmission fluid temperature

Throttle angle

Ignition voltage

1-2 shift solenoid

2-3 shift solenoid

TCC solenoid duty cycle

TCC slip speed

5. Check the garage shifts.

1. Apply the brake pedal and ensure that the parking brake is set.

2. Move the gear selector through the following ranges:

1. PARK to REVERSE

2. REVERSE to NEUTRAL

3. NEUTRAL to DRIVE

3. Pause 2-3 seconds in each gear position.

4. Verify the gear engagements are immediate and not harsh.

IMPORTANT: Harsh engagement may be caused by any of the following

conditions:

High idle speed-Compare engine idle speed to desired
idle speed.

Commanded low PC solenoid current-Compare PC
solenoid reference current to PC solenoid actual current.

A default condition caused by certain DTCs that result in
maximum line pressure to prevent slippage

2007 Hummer H3

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

6. Monitor transmission range on the scan tool, engine list.

1. Apply the brake pedal and ensure the parking brake is set.

2. Move the gear selector through all ranges.

3. Pause 2-3 seconds in each range.

4. Return gear selector to PARK.

5. Verify that all selector positions match the scan tool display.

7. Check throttle angle input.

1. Apply the brake pedal and ensure that the parking brake is set.

2. Ensure the gear selector is in PARK.

3. Monitor throttle angle while increasing and decreasing engine speed with the throttle

pedal. The scan tool throttle angle should increase and decrease with engine speed.

If any of the above checks do not perform properly, record the result for reference after
completion of the road test.

Upshift Control and Torque Converter Clutch (TCC) Apply

The transmission control module (TCM) calculates the upshift points based primarily on 2 inputs:
throttle angle and vehicle speed. When the TCM determines that conditions are met for a shift to
occur, the TCM commands the shift by closing or opening the ground circuit for the appropriate
solenoid.

Perform the following steps:

Low transmission fluid temperature

IMPORTANT: Soft or delayed engagement may be caused by any of the

following conditions:

Low idle speed-Compare engine idle speed to desired
idle speed.

Low fluid level

Commanded high PC solenoid current-Compare PC
solenoid reference current to PC solenoid actual current.

Cold transmission fluid-Check for low transmission fluid
temperature.

2007 Hummer H3

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

1. Refer to Shift Speed and choose a throttle position shown to cover the normal driving

range.

2. Monitor the following scan tool parameters:

Throttle angle

Vehicle speed

Input speed - some models

Engine speed

Output shaft speed

Commanded gear

Slip speed

Solenoid states

3. Place the gear selector in the OVERDRIVE position.

4. Accelerate the vehicle using the chosen throttle angle. Hold the throttle steady.

5. As the transmission upshifts, note the vehicle speed when the shift occurs for each gear

change. There should be a noticeable shift feel or engine speed change within 1-2 seconds of
the commanded gear change.

6. Compare the shift speeds to the Shift Speed table. Refer to Shift Speed . Shift speeds may

vary slightly due to transmission fluid temperature or hydraulic delays in responding to
electronic controls.

Note any harsh, soft or delayed shifts or slipping.

Note any noise or vibration.

7. Repeat steps 1-6 as necessary in order to evaluate the different throttle angles.

IMPORTANT: This transmission is equipped with an electronically

controlled capacity clutch (ECCC). The pressure plate does
not fully lock to the torque converter cover. Instead, the
pressure plate maintains a small amount of slippage, about
20 RPM, in SECOND, THIRD and FOURTH gears, depending
on the vehicle application. ECCC was developed to reduce
the possibility of noise, vibration or chuggle caused by TCC
apply. Typical apply speeds are 49-52 km/h (30-32 mph) in
THIRD gear and 65-73 km/h (40-45 mph) in FOURTH gear. Full
lockup is available at highway speeds on some applications.

IMPORTANT: The TCC will not engage until the engine is in closed loop

2007 Hummer H3

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