Hummer H2. Manual - part 2589

Fig. 322: Transmission ID Information 
Courtesy of GENERAL MOTORS CORP. 

Callouts For Fig. 322 

PARK - ENGINE RUNNING 

With the gear selector lever in the PARK (P) position and the engine running, the line pressure from the oil 

Callout

Component Name

1

4 = 2004

2

Model

3

Hydra-Matic 4L60-E

4

Julian Date - or Day of the Year

5

Shift Built - A, B, J = First Shift; C, H, W = Second Shift

6

Serial Number

7

Transmission ID Location

7

Transmission ID Location

8

Optional Transmission ID Location

 

2004 Hummer H2 

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

  

pump assembly is directed to various components in the valve body and the oil pump. 

Pressure Regulator Valve 

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 

IMPORTANT: TCC converter feed valve assembly (#4), in the converter feed circuit, prevents 

converter drain down. The orifice is smaller than the exhaust through the TCC 
solenoid valve. Therefore, fluid pressure does not build up at the end of the 
converter clutch apply valve.

 

2004 Hummer H2 

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

  

Under normal operating conditions, the PCM keeps the normally open TCC solenoid valve de-energized (OFF). 
Converter feed fluid exhausts through the open TCC solenoid valve, and spring force keeps the converter clutch 
apply valve in the release position. 

Converter Clutch Valve 

Held in the release position by spring force, it directs converter feed fluid into the release fluid circuit. Also, 
fluid returning from the converter in the apply fluid circuit is routed through the valve and into the cooler fluid 
circuit. 

Torque Converter 

Release fluid pressure unseats the TCC apply checkball (#9), keeps the pressure plate released from the 
converter cover and fills the converter with fluid. Fluid exits the converter between the converter hub and the 
stator shaft in the apply fluid circuit. 

Cooler and Lubrication System 

Cooler fluid from the converter clutch apply valve is routed through the transmission fluid cooler and into the 
lubrication fluid circuits. 

Manual Valve 

Controlled by the selector lever and the manual shaft, the manual valve is in the Park (P) position and directs 
the line pressure into the PR (Park/Reverse) fluid circuit. Line pressure is blocked from entering any other fluid 
circuit at the manual valve. 

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 the piston. 
Orificing the PR fluid around the #10 checkball helps control the lo and reverse clutch apply. Also, Lo/reverse 
fluid pressure from the lo overrun valve acts on the inner area of the lo and reverse clutch piston in order to 
increase the clutch holding capacity. 

Lo Overrun Valve 

The PR fluid pressure moves the valve against the spring force and fills the Lo/reverse fluid circuit. Lo/reverse 
fluid is orificed (323) back to the lo overrun valve in order to assist the PR fluid in moving the valve against the 
spring force. The spring force provides a time delay for the PR fluid filling the Lo/reverse fluid circuit. The 
Lo/reverse fluid is routed to the inner area of the lo and reverse clutch piston in order to increase the holding 
capacity of the clutch. 

Transmission Fluid Pressure (TFP) Manual Valve Position Switch Assembly 

The TFP manual valve position switch consists of five fluid pressure switches: D2 and D3 are normally closed 
and D4, Lo and Rev are normally open. All fluid circuits routed to the assembly are empty and the TFP manual 

 

2004 Hummer H2 

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

  

valve position switch signals the PCM that the transmission is in either Park or Neutral. 

Shift Solenoid Valves (1-2 and 2-3) 

Both shift solenoid valves, which are normally open, are energized by the PCM and block fluid from 
exhausting. This maintains the signal A fluid pressure at the 1-2 shift solenoid valve and signal B fluid pressure 
at the 2-3 shift solenoid valve. 

Shift Valves (1-2, 2-3 and 3-4) 

Signal A fluid pressure holds the 1-2 shift valve in the downshift position and the 3-4 valve in the upshift (first 
and fourth gear) position. The signal B fluid pressure from the 2-3 shift solenoid valve holds the 2-3 shift valve 
train in the downshift position. 

 

2004 Hummer H2 

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