Hummer H2. Manual - part 2597

Fig. 331: Overdrive Range, 3-2 Downshift
Courtesy of GENERAL MOTORS CORP. 

MANUAL THIRD GEAR 

A manual 4-3 downshift is available to increase vehicle performance when the use of only three gear ratios is 
desired. Manual Third gear range also provides engine braking in Third gear when the throttle is released. A 
manual 4-3 downshift is accomplished by moving the selector lever into the Manual Third (D) position. This 
moves the manual valve and immediately downshifts the transmission into Third gear. Refer to Overdrive 
Range, Fourth Gear - Torque Converter Clutch (TCC) Applied for a complete description of a 4-3 
downshift. In Manual Third, the transmission is prevented, both hydraulically and electronically, from shifting 
into Fourth gear. The following information explains the additional changes during a manual 4-3 downshift as 
compared to a forced 4-3 downshift. 

Manual Valve 

The selector lever moves the manual shaft and manual valve into the Manual Third position (D). This allows 
line pressure to enter the D3 fluid circuit. 

Transmission Fluid Pressure (TFP) Manual Valve Position Switch Assembly 

D3 fluid is routed to the TFP manual valve position switch and opens the normally closed D3 fluid pressure 
switch. The combination of the opened D3 switch and the closed D4 switch signals the PCM that the 
transmission is operating in Manual Third. 

1-2 Shift Solenoid (SS) Valve 

When Manual Third is selected, the PCM de-energizes the 1-2 SS valve to immediately downshift the 
transmission into Third gear. This electronically prevents Fourth gear. 

3-4 Shift Valve 

D3 fluid pressure assists spring force to keep the valve in the downshifted position against the signal A fluid 
circuit. In this position, the valve blocks 3-4 signal fluid and the 4th signal fluid circuit is open to an exhaust 
port past the valve. Therefore, with D3 fluid pressure assisting spring force, Fourth gear is hydraulically 
prevented. 

2-3 Shift Valve Train 

With the 2-3 SS valve de-energized and open, actuator feed limit (AFL) fluid acting on the 2-3 shift valve holds 
both valves in the upshifted position. This allows D3 fluid to feed the overrun fluid circuit through the 2-3 shift 
valve. 

Overrun Clutch Feed Checkball (#5) 

Overrun fluid pressure seats the ball against the empty D2 fluid circuit.

 

2004 Hummer H2 

2004 TRANSMISSION/TRANSAXLE Automatic Transmission - Overhaul - 4L60-E/4L65-E

  

Overrun Clutch Control Checkball (#6) 

Overrun fluid pressure seats the #6 checkball and is orificed (#20) to fill the overrun clutch feed fluid circuit. 
This orifice controls the overrun clutch apply rate. 

3-4 Relay Valve and 4-3 Sequence Valve 

4th signal fluid pressure is exhausted from the end of the 3-4 relay valve. Overrun clutch feed fluid pressure 
assists spring force and closes both valves. This allows overrun clutch feed fluid to flow through the 4-3 
sequence valve and fill the overrun clutch fluid circuit. 

Overrun Clutch Piston 

Overrun clutch fluid pressure moves the piston to apply the overrun clutch plates. The overrun clutch plates 
provide engine compression braking in Manual Third - Third Gear. 

Overrun Clutch Air Bleed Checkball 

This ball and capsule is located in the overrun clutch fluid circuit in the oil pump. It allows air to exhaust from 
the circuit as fluid pressure increases and also allows air into the circuit to displace the fluid when the clutch 
releases. 

Overrun Clutch Applied - M33 Only 

In order to achieve the highest fuel efficiency, the overrun clutch is applied during vehicle coast and braking. 
With the transmission in overdrive and either second or third gear, the overrun clutch is applied, allowing power 
to be transferred back through the torque converter to the electric machine and engine. 

With the transmission in the D4 range and in either third or second gear, the M33 model applies the overrun 
clutch in order to maximize fuel efficiency during vehicle coast and braking. In this state, vehicle inertia is used 
to drive the engine and the electrical machine through the transmission. While in D4 third gear, the 2-3 SS valve 
is de-energized and the 2-3 shift valve train is in the upshift position. However, D3 oil is not available to apply 
the overrun clutch. In order to apply the overrun clutch, the spacer plate is used to redirect D2 oil to the overrun 
clutch circuit through the 2-3 valve train. 

In D4 second gear, the 2-3 SS valve is energized and the 2-3 shift valve train is in the downshift position 
normally allowing overrun clutch circuit to exhaust. With the spacer plate redirecting the D2 oil, the overrun 
clutch can be applied. 

Control Valve Body Ball Check Valve - M33 Only 

Fluid pressure, from the automatic transmission secondary fluid pump assembly, unseats the ball check valve to 
allow fluid flow to the manual valve, where it is directed to the overrun clutch hydraulic circuit. The check 
valve prevents fluid, from the main transmission oil pump, from flowing into the secondary fluid pump. 

Torque Converter Clutch and Torque Converter Clutch PWM Solenoid Valve

 

2004 Hummer H2 

2004 TRANSMISSION/TRANSAXLE Automatic Transmission - Overhaul - 4L60-E/4L65-E

  

The PCM de-energizes the TCC solenoid valve and operates the duty cycle of the TCC PWM solenoid valve to 
release the converter clutch prior to downshifting, (assuming the converter clutch is applied in Overdrive 
Range-Fourth Gear when Manual Third is selected). The PCM will re-apply the converter clutch in Manual 
Third-Third Gear when proper driving conditions have been met. 

Pressure Control (PC) Solenoid Valve 

The PC solenoid valve operates in the same manner as Overdrive Range, regulating in response to throttle 
position and other vehicle operating conditions. 

Manual Third - First and Second Gears: Overrun Clutch Released 

In Manual Third, the transmission upshifts and downshifts normally between First, Second and Third gears. 
However, in First and Second gears, the 2-3 SS valve is energized and the 2-3 shift valve train is in the 
downshifted position. The 2-3 shift valve blocks D3 fluid from entering the overrun fluid circuit and opens the 
overrun fluid circuit to an exhaust port at the valve. This prevents overrun clutch apply and engine compression 
braking in Manual Third-First and Second Gears.

 

2004 Hummer H2 

2004 TRANSMISSION/TRANSAXLE Automatic Transmission - Overhaul - 4L60-E/4L65-E

  

Fig. 332: Manual Third Gear 
Courtesy of GENERAL MOTORS CORP.

 

2004 Hummer H2 

2004 TRANSMISSION/TRANSAXLE Automatic Transmission - Overhaul - 4L60-E/4L65-E