Hummer H3. Manual — part 721

8. Check for TCC apply in THIRD and FOURTH gear.

Note the TCC apply point. When the TCC applies there should be a noticeable drop in
engine speed and a drop in slip speed to below 100 RPM. If the TCC apply can not be
detected:

Check for DTCs.

Refer to Torque Converter Diagnosis.

Refer to the table Shift Speed for the correct apply speed.

Part Throttle Detent Downshift

1. Place the gear selector in the OVERDRIVE position.

2. Accelerate the vehicle to 64-88 km/h (40-55 mph) in FOURTH gear.

3. Quickly increase throttle angle to greater than 50 percent.

4. Verify the following:

The TCC releases.

The transmission downshifts immediately to THIRD gear.

Full Throttle Detent Downshift

1. Place the gear selector in the OVERDRIVE position.

2. Accelerate the vehicle to speeds of 64-88 km/h (40-55 mph) in FOURTH gear.

3. Quickly increase throttle angle to 100 percent (WOT).

4. Verify the following:

The TCC releases.

The transmission downshifts immediately to SECOND gear.

Manual Downshifts

The shift solenoid valves do not control the initial downshift for the 4-3 or the 3-2 manual
downshifts. The 4-3 and the 3-2 manual downshifts are hydraulic. The 2-1 manual downshift is
electronic. The solenoid states should change during or shortly after a manual downshift is
selected.

operation and the vehicle speed is as shown in the Shift
Speed table. Refer to Shift Speed . The vehicle must be in a
near-cruise condition, not accelerating or coasting and on a
level road surface.

2007 Hummer H3

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

Manual 4-3 Downshift

1. Place the gear selector in the OVERDRIVE position.

2. Accelerate the vehicle to 64-88 km/h (40-55 mph) in FOURTH gear.

3. Release the throttle while moving the gear selector to THIRD.

4. Verify the following:

The TCC releases.

The transmission downshifts immediately to THIRD gear.

The engine slows the vehicle.

Manual 4-2 Downshift

1. Place the gear selector in the OVERDRIVE position.

2. Accelerate the vehicle to 64-72 km/h (40-45 mph).

3. Release the throttle while moving the gear selector to SECOND.

4. Verify the following:

The TCC releases.

The transmission downshifts immediately to SECOND gear.

The engine slows the vehicle.

Manual 4-1 Downshift

1. Place the gear selector in the OVERDRIVE position.

2. Accelerate the vehicle to 48 km/h (30 mph).

3. Release the throttle while moving the gear selector to FIRST.

4. Verify the following:

The TCC releases.

The transmission downshifts immediately to FIRST gear.

The engine slows the vehicle.

Coasting Downshifts

1. Place the gear selector in the OVERDRIVE position.

2. Accelerate the vehicle to FOURTH gear with the TCC applied.

3. Release the throttle and lightly apply the brakes.

4. Verify the TCC releases.

2007 Hummer H3

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

Manual Gear Range Selection

The shift solenoids control the upshifts in the manual gear ranges.

Perform the following tests using 10-15 percent throttle angle.

Reverse

1. With the vehicle stopped, move the gear selector to REVERSE.

2. Slowly accelerate the vehicle.

3. Verify that there is no noticeable slip, noise or vibration.

Manual First

1. With the vehicle stopped, move the gear selector to FIRST.

2. Accelerate the vehicle to 32 km/h (20 mph).

3. Verify the following:

No upshifts occur.

The TCC does not apply.

There is no noticeable slip, noise or vibration.

Manual Second

1. With the vehicle stopped, move the gear selector to SECOND.

2. Accelerate the vehicle to 57 km/h (35 mph).

3. Verify the following:

The 1-2 shift occurs.

The 2-3 shift does not occur.

There is no noticeable slip, noise or vibration.

Manual Third

1. With the vehicle stopped, move the gear selector to THIRD.

2. Accelerate the vehicle to 64 km/h (40 mph).

3. Verify the following:

The 1-2 shift occurs.

The 2-3 shift occurs.

2007 Hummer H3

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

There is no noticeable slip, noise or vibration.

TORQUE CONVERTER DIAGNOSIS

The torque converter clutch (TCC) is applied by fluid pressure, which is controlled by a pulse
width modulation (PWM) solenoid valve. This solenoid valve is located inside of the automatic
transmission assembly. The solenoid valve is controlled through a combination of computer
controlled switches and sensors.

Torque Converter Stator

The torque converter stator roller clutch can have 2 different malfunctions.

The stator assembly freewheels in both directions.

The stator assembly remains locked up at all times.

Poor Acceleration at Low Speed

If the stator is freewheeling at all times, the vehicle tends to have poor acceleration from a
standstill. At speeds above 50-55 km/h (30-35 mph), the vehicle may act normally. For poor
acceleration, you should first determine that the exhaust system is not blocked and the
transmission is in First gear when starting out.

If the engine freely accelerates to high RPM in NEUTRAL, you can assume that the engine and
the exhaust system are normal. Check for poor performance in DRIVE and REVERSE to help
determine if the stator is freewheeling at all times.

Poor Acceleration at High Speed

If the stator is locked up at all times, performance is normal when accelerating from a standstill.
Engine RPM and vehicle speed are limited or restricted at high speeds. Visual examination of the
converter may reveal a blue color from overheating.

If the converter has been removed, you can check the stator roller clutch by inserting a finger into
the splined inner race of the roller clutch and trying to turn the race in both directions. You
should be able to freely turn the inner race clockwise, but you should have difficulty in moving
the inner race counterclockwise or you may be unable to move the race at all.

Noise

IMPORTANT: Do not confuse this noise with pump whine noise, which is

usually noticeable in PARK, NEUTRAL and all other gear ranges.

2007 Hummer H3

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