The pressure regulator valve regulates the oil pump output (line pressure) in response to the signal
fluid pressure, the spring force and the line pressure acting on the end of the valve. The line
pressure is routed through the valve and into both the converter feed and the decrease fluid
circuits. Regulated line pressure is also directed to the manual valve, the converter clutch valve,
the actuator feed limit valve and the regulated apply valve.
Pressure Relief Valve
Controlled by spring force, this checkball limits the maximum value of the line pressure. When
the line pressure reaches this limiting value, fluid is exhausted past the ball and returns to the
sump.
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
entering the AFL fluid circuit. Below this limiting value, the AFL fluid pressure equals the line
pressure. The AFL fluid is routed to the pressure control solenoid valve, the 3-2 control solenoid
valve, the TCC PWM solenoid valve, the 1-2 and 2-3 shift solenoid valves and the 2-3 shift valve
train.
Pressure Control (PC) Solenoid Valve
Controlled by the powertrain control module (PCM), the PC solenoid valve regulates the filtered
AFL fluid into the torque signal fluid pressure. The PCM controls this regulation by varying the
current value to the PC solenoid valve in relation to the throttle position and other vehicle
operating conditions.
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
OFF. This prevents AFL fluid from entering the converter clutch signal fluid circuit. Regulated
line pressure is routed to the regulator apply valve, which is open with CC signal circuit empty
and blocks line pressure from entering the regulated apply circuit. Any fluid in the regulated
apply circuit will exhaust at the regulated apply valve.
TCC Solenoid Valve
2007 Hummer H3
2007 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - H3