Hummer H2. Manual - part 2458

4. Apply compressed air to the J 44246 .  

5. Air should flow through the solenoid. If air does not flow through the solenoid, replace the solenoid. 

Refer to Control and Shift Solenoids Replacement .  

6. Connect the solenoid testing harness to the 12-volt positive (+) and negative (-) battery terminals.  

7. Observe if the solenoid is operating electrically. An audible clicking noise can be heard when connecting 

or disconnecting power. 

8. Observe the air flow through the solenoid. The flow will completely or nearly completely stop. Replace 

the solenoid if there continues to be an obvious air leak when the solenoid is energized. 

9. Install the shift solenoid valve into the control valve body or the TCC solenoid valve into the transmission 

case. Refer to Control and Shift Solenoids Replacement or Torque Converter Clutch Pulse Width 
Modulation (TCC PWM) Solenoid, TCC Solenoid, and Wiring Harness .  

AUTOMATIC TRANSMISSION OIL COOLER FLUSHING AND FLOW TEST (J 45096) 

GM studies indicate that plugged or restricted transmission oil coolers and pipes cause insufficient transmission 
lubrication and elevated operating temperatures which can lead to premature transmission failure. Many repeat 
repair cases could have been prevented by following published procedures for transmission oil cooler flushing 
and flow checking. This procedure includes flow checking and flushing the auxiliary transmission oil cooler, if 
equipped. 

Only GM Goodwrench DEXRON(R)III automatic transmission fluid should be used when doing a repair on a 
GM transmission. 

Time allowance for performing the cooler flow checking and flushing procedure has been included in the 
appropriate labor time guide operations since the 1987 model year. The service procedure steps for oil cooler 
flushing and flow testing are as follows: 

Cooler Flow Check and Flushing Steps 

IMPORTANT: Do not use air pressure in excess of 827.4 kPa (120 psi). Excessive 

pressure will not allow the solenoid ball check valve to seat properly. 
Recommended air pressure is 344.75 kPa (50 psi).

IMPORTANT:

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All solenoids need to be energized to seal.  

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A small amount of air leakage is normal +/- 21 kPa (+/- 3 psi). 

IMPORTANT: Inspect the O-rings after the test to be sure that they are not cut or 

damaged.

IMPORTANT: Use the J 45096 or equivalent to flush and flow test the transmission oil cooler 

and the oil cooler pipes after the transaxle is removed for repairs.

 

2004 Hummer H2 

2004 TRANSMISSION Automatic Transaxle - 4L60-E/4L65-E (Troubleshooting)

  

1. Machine Set-up  

2. Determine Minimum Flow Rate  

3. Back Flush  

4. Forward Flush  

5. Flow Test  

6. Code Recording Procedure  

7. Clean-up  

Tools Required 

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J 35944-200 Cooler Flushing Adapter  

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J 45096 Transmission Oil Cooling System Flush and Flow Test Tool  

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Shop air supply with water/oil filters, regulator and pressure gauge - minimum 90 psi  

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Eye protection  

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Rubber gloves  

Machine Set-up 

 

2004 Hummer H2 

2004 TRANSMISSION Automatic Transaxle - 4L60-E/4L65-E (Troubleshooting)

  

Fig. 8: Turning Main Function Switch To IDLE Position 
Courtesy of GENERAL MOTORS CORP. 

1. Verify that the main power switch (1) is in the OFF position.  

2. Place the main function switch (2) in the IDLE position. 

 

2004 Hummer H2 

2004 TRANSMISSION Automatic Transaxle - 4L60-E/4L65-E (Troubleshooting)

  

Fig. 9: Connecting J 45096 To Vehicle 12-Volt DC Power Source 
Courtesy of GENERAL MOTORS CORP. 

3. Connect J 45096 to the vehicle 12-volt DC power source by connecting the red battery clip to the positive 

(+) battery post on the vehicle and connect the negative (-) lead to a known good chassis ground.  

4. Turn the main power switch to the ON position. 

 

2004 Hummer H2 

2004 TRANSMISSION Automatic Transaxle - 4L60-E/4L65-E (Troubleshooting)