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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. Take along qualified help in order to operate the vehicle safely. Observe any unusual sounds or smells. After the road test, check the following: Inspect for proper transmission fluid level. Refer to Transmission Fluid Check. Inspect for any diagnostic trouble codes (DTCs) that may have set during the testing. Refer Monitor the scan tool data for any abnormal readings or data. Inspect for fluid leaks. Refer to Fluid Leak Diagnosis. ELECTRICAL FUNCTION CHECK Perform this procedure first in order to ensure the electronic transmission components are 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 Control Module References for typical data values. Data that is questionable may Engine Speed Transmission ISS Transmission OSS
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - 6L50/6L80/6L90 - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Vehicle Speed IMS Commanded Gear Gear Ratio Line PC Sol. Pressure Cmd. TCC Brake Switch ECT, Engine Data List Trans. Fluid Temp. TCM Temperature Calc. Throttle Position Ignition Voltage TFP Switch 1 TFP Switch 3 TFP Switch 4 TFP Switch 5 PC Sol. 2 Pressure Cmd. PC Sol. 3 Pressure Cmd. PC Sol. 4 Pressure Cmd. PC Sol. 5 Pressure Cmd. Shift Solenoid 1 Shift Solenoid 2 TCC PC Sol. Duty Cycle TCC Slip Speed 5. Monitor the TCC Brake Switch parameter while applying and releasing the brake pedal. The scan tool should display: Open when the brake pedal is applied. Closed when the brake pedal is released. 6. Check the garage shifts. 1. Apply the brake pedal and ensure the parking brake is set. 2. Move the gear selector through the following ranges: 1. PARK to REVERSE 2. REVERSE to NEUTRAL
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - 6L50/6L80/6L90 - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
3. NEUTRAL to DRIVE 3. Pause 2 to 3 seconds in each gear position. 4. Verify the gear engagements are immediate and not harsh. 7. Monitor transmission range on the scan tool, engine data list. 1. Apply the brake pedal and ensure the parking brake is set. 2. Move the gear selector through all ranges. 3. Pause 2 to 3 seconds in each range. 4. Return gear selector to PARK. 5. Verify that all selector positions match the scan tool display. 8. Check throttle position input. 1. Apply the brake pedal and ensure the parking brake is set. IMPORTANT: Harsh engagement may be caused by any of the following conditions: High engine idle speed-Compare engine idle speed to Commanded low pressure control (PC) solenoid current- A default condition caused by certain DTCs that result in 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-Investigate PC Cold transmission fluid temperature (TFT)-Use the scan Selector linkage-Inspect and adjust as necessary.
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - 6L50/6L80/6L90 - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
2. Ensure the gear selector is in PARK. 3. Monitor the scan tool Calc. Throttle Position while increasing and decreasing engine speed with the throttle pedal. The scan tool Calc. Throttle Position percentage should If any of the above checks do not perform properly, record the result for reference after UPSHIFT CONTROL AND TORQUE CONVERTER CLUTCH (TCC) APPLY The TCM calculates the upshift points based primarily on 2 inputs: throttle position and vehicle Perform the following steps: 1. Refer to Shift Speed table in this section and choose a throttle position of 12.5 percent or 25 percent. All throttle positions shown should be tested to cover the normal driving range. 2. Monitor the following scan tool parameters: Calc. Throttle Position Vehicle Speed Engine Speed Transmission ISS Transmission OSS Commanded Gear TCC PC Sol. Pressure Cmd. TCC Pressure Actual TCC Slip Speed TFP Switch 1 TFP Switch 3 TFP Switch 4 TFP Switch 5 PC Sol. 2 Pressure Cmd. PC Sol. 3 Pressure Cmd. PC Sol. 4 Pressure Cmd. PC Sol. 5 Pressure Cmd.
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - 6L50/6L80/6L90 - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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