|
|
2WD Two-Wheel Drive 4WD Four-Wheel Drive TRANSMISSION IDENTIFICATION INFORMATION Fig. 515: Nameplate Location Callout Component Name 1 Nameplate
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Fig. 516: Nameplate Components EXTERNALLY GENERATED ELECTRONIC INTERFERENCE (SPEED SENSOR SIGNALS) Use the following procedures in order to determine if speed sensor signals, generated by a source 1. Turn the ignition ON. 2. Keep the engine OFF. 3. If the transmission control module (TCM) is ON, install the scan tool. Callout Component Name 1 Date of Manufacture 2 Transmission Identification Number 3 Engineering Feature Configuration Number 4 Serial Number IMPORTANT: If false speed signals were present at the previous shutdown, the TCM might still be ON, even though the ignition is OFF.
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
4. Read the speed sensor signals. 5. If a speed sensor signal is something other than one (1), there is a short to another circuit that is carrying an AC or pulse width modulated (PWM) signal. 6. Measure the resistance of the sensor. 7. Inspect for shorts to other circuits within the harness or transmission connector. 8. Inspect to ensure there is no conductive material inside the connector. 9. Inspect to ensure the speed sensor circuit wires are a twisted pair. 10. Inspect to ensure a properly grounded drain wire. 11. Inspect for the presence of a strong external AC signal. 12. Repair or replace parts as required. TRANSMISSION GENERAL DESCRIPTION Allison 1000 Series transmissions are torque converter driven, fully automatic, transmission Direct mount to engine block Flexplate drive Torque converter with a torque converter clutch (TCC) and integral vibration damper 3 constant-mesh planetary gear sets with helical gears 5 multiple disk clutches - 2 rotating and 3 stationary Common hydraulic system for all transmission functions 2 transmission fluid filtration systems Electrohydraulic control valve assembly Electronically controlled automatic gear selection and clutch apply Fill tube/dipstick provision on both sides of transmission Parking pawl Power takeoff (PTO) provision on both sides of transmission TRANSMISSION COMPONENT AND SYSTEM DESCRIPTION Engine/Transmission Connection The converter housing of 1000 Series transmissions mates directly to the engine block. Flexplate
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
drive is used for engine-to-transmission torque transfer. Torque Converter Several torque converters are available to match the transmissions to a wide variety of diesel and Gear Sets The planetary gear train includes 3 constant-mesh planetary gear sets containing high-helix gears. Clutches 5 clutches, 2 rotating and 3 stationary, direct the flow of torque through the transmission. All Hydraulic System A common hydraulic system serves the torque converter and the transmission. Transmission fluid Transmission Fluid Filtration Fluid filtration is provided by 2 filter systems. A suction filter, located in the sump, provides Electrohydraulic Control Valve Assembly
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
|
|
|