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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 pressure plug. 8. Install the J 21867 . 9. Access the Scan Tool Output Control for the PC Solenoid. 10. Start the engine. 11. Begin commanding PC Solenoid at 1.0 amp and lower the amperage in one-tenth increments (0.01) until maximum line pressure is achieved. 12. Allow the pressure to stabilize between increments. 13. Compare your pressure readings to the Line Pressure table. Refer to Line Pressure . 14. If the pressure readings vary greatly from the line pressure table, refer to Oil Pressure High or Low. 15. Turn the engine OFF. 16. Remove the J 21867 . 17. Install the pressure plug. Tighten: Tighten the pressure plug to 8-14 N.m (6-10 lb ft). IMPORTANT: It may be necessary to remove or disconnect components in order to gain access to the transmission line pressure test IMPORTANT: In order to achieve accurate line pressure readings, the following procedure must be performed at least three times NOTE: Refer to Fastener Notice .
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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 Full Throttle Detent Downshifts Manual Downshifts Coasting Downshifts Manual Gear Range Selection REVERSE Manual FIRST Manual SECOND Manual THIRD Before the road test, ensure the following: 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. 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 - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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 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 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 Transmission Control Module Scan Tool Information (4L60-E) or Engine speed Transmission output speed 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
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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 Commanded low PC solenoid current-Compare PC A default condition caused by certain DTCs that result in 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 Low fluid level Commanded high PC solenoid current-Compare PC
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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