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HOT CHECK PROCEDURE 1. Locate the transmission dipstick at the rear of the engine compartment, on the passemger's side of the vehicle. 2. Flip the handle up, and then pull out the dipstick and wipe it with a clean rag or paper towel. 3. Install the dipstick by pushing it back in all the way, wait three seconds and then pull it back out again. 4. Check both sides of the dipstick, and 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 below. 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 TFT is between 160°F and 200°F (71°C and 93° 7. If the fluid level is in the acceptable range, push the dipstick back in all the way, then flip the handle down to lock the dipstick in place. 8. 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. IMPORTANT: Us this procedure to check the transmission fluid level when the TFT is between 160°F and 200°F (71°C and 93°C). The hot IMPORTANT: Always check the fluid level at least twice. Consistent readings are important to maintaining proper fluid level. If
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - 6L50/6L80/6L90 - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
If the fluid color is very dark or black and has a burnt odor, inspect the fluid and inside of Fluid that is cloudy or milky or appears to be contaminated with water indicates engine LINE PRESSURE CHECK Fig. 6: View Of Transmission & J 21867 Pressure Gage
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - 6L50/6L80/6L90 - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
TOOLS REQUIRED J 21867 Pressure Gage CHECK 1. Install a scan tool. 2. Start the engine. 3. Inspect the transmission for the proper fluid level. 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 line pressure test hole plug. 8. Install the J 21867 . 9. Access the Scan Tool Transmission Output Controls for the Line PC Solenoid. 10. Start the engine. 11. Use the scan tool to increase and decrease the Line PC Solenoid in increments of approximately 100 KPa (15 psi). The scan tool commands the increment values 12. Allow the pressure to stabilize between increments. CAUTION: Keep the brakes applied at all times in order to prevent unexpected vehicle motion. Personal injury may result if IMPORTANT: You may need to remove or disconnect components in order to gain access to the transmission line pressure test hole IMPORTANT: In order to achieve accurate line pressure readings, the following procedure must be performed at least three times
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - 6L50/6L80/6L90 - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
13. Compare your pressure readings on the scan tool to those indicated on the J 21867 . 14. If the pressure readings vary greatly, refer to Fluid Pressure High or Low. 15. Turn the engine OFF. 16. Remove the J 21867 . 17. Install the line pressure test hole plug. Tighten: Tighten the pressure plug to 11 N.m (97 lb in). ROAD TEST The following test provides a method of evaluating the condition of the automatic transmission. Electrical Function Check Upshift Control and Torque Converter Clutch (TCC) Apply Part Throttle Detent Downshifts Manual Downshifts Coasting Downshifts Manual Gear Range Selection REVERSE Driver Shift Control Before the road test, ensure the following: The engine is performing properly. Transmission fluid level is correct. Refer to Transmission Fluid Check. NOTE: Refer to Fastener Notice . IMPORTANT: The Road Test Procedure should be performed only as part of the Symptom Diagnosis. Refer to Symptoms - Automatic IMPORTANT: Complete the test in the sequence given. Incomplete testing cannot guarantee an accurate evaluation.
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - 6L50/6L80/6L90 - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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