Chevrolet Silverado / GMC Sierra. Service manual — part 1019

2. Install the TCC solenoid valve, the 1-2 shift solenoid valve or the 2-3 shift solenoid valve

into bore number 2 of the J 44246 and install the factory retainer clip to retain the solenoid.
See Special Tools.

Fig. 6: View Of Solenoid Testing Harness And Solenoid
Courtesy of GENERAL MOTORS CORP.

IMPORTANT: The supplied solenoid testing harness will not power the

4L60-E TCC On/Off solenoid. To energize this solenoid, apply
battery, 12-volt, positive (+) and negative (-) to the TCC
On/Off solenoid wiring harness using connector test adapter

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis

Silverado, Sierra & Silverado

3. Connect the solenoid testing harness supplied with the J 44246 to the solenoid. See Special

Tools.

4. Apply compressed air to the J 44246 . See Special Tools.

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 Solenoid, Torque Converter Clutch
Solenoid, and Wiring Harness

.

TRANSMISSION FLUID COOLER FLUSHING AND FLOW TEST (J 45096)

kit J 35616 . Use terminal E, Red, Power, and terminal T,
Black, Ground. Refer to the Inline Harness Connector End
Views .

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:

All solenoids need to be energized to seal.

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.

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis

Silverado, Sierra & Silverado

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®VI 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

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

J 35944-200 Cooler Flushing Adapter. See Special Tools.

J 45096 Transmission Oil Cooling System Flush and Flow Test Tool. See Special Tools.

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

Eye protection

Rubber gloves

MACHINE SET-UP

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. See Special Tools.

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis

Silverado, Sierra & Silverado

Fig. 7: View Of Main Power Switch & Main Function Switch
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.

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis

Silverado, Sierra & Silverado