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through the sensor's magnetic field. The AC voltage level and the number of pulses increase as the Automatic Transmission Fluid Temperature Sensor The automatic transmission fluid temperature (TFT) sensor is part of the automatic transmission The transmission control module (TCM) supplies a 5-volt reference signal to the TFT sensor and The TCM uses the TFT sensor information to control shift quality and torque converter clutch Transmission Range Switch
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Fig. 546: View Of Transmission Range Switch The transmission range (TR) switch is part of the park/neutral position (PNP) and backup lamp PARK - ENGINE RUNNING With the gear selector lever in the PARK (P) position and the engine running, the line pressure Pressure Regulator Valve
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
The pressure regulator valve regulates the oil pump output (line pressure) in response to the signal Pressure Relief Valve Controlled by spring force, this checkball limits the maximum value of the line pressure. When Line Pressure Tap The line pressure tap provides a location to measure the line pressure with a fluid pressure gage. Actuator Feed Limit Valve Biased by spring force and orificed AFL fluid, it limits the maximum value of line pressure Pressure Control (PC) Solenoid Valve Controlled by the powertrain control module (PCM), the PC solenoid valve regulates the filtered Torque Converter Clutch (TCC) Torque Converter Clutch PWM Solenoid and Regulator Apply and Isolator Valve AFL fluid is routed to the TCC PWM solenoid valve, in Park the PCM has the duty cycle turned TCC Solenoid Valve
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Under normal operating conditions, the PCM keeps the normally open TCC solenoid valve de- Converter Clutch Valve Held in the release position by spring force, it directs converter feed fluid into the release fluid Torque Converter Release fluid pressure unseats the TCC apply checkball (#9), keeps the pressure plate released Cooler and Lubrication System Cooler fluid from the converter clutch apply valve is routed through the transmission fluid cooler Manual Valve Controlled by the selector lever and the manual shaft, the manual valve is in the Park (P) position Lo and Reverse Clutch Applies Lo and Reverse Clutch Piston The PR fluid seats the lo and reverse clutch checkball (#10) and is orificed to the outer area of Lo Overrun Valve IMPORTANT: TCC converter feed valve assembly (#4), in the converter feed circuit, prevents converter drain down. The orifice is smaller than
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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