Hummer H3. Manual — part 734

HARSH SHIFTS

Harsh Shifts

INACCURATE SHIFT POINTS

Inaccurate Shift Points

Checks

Causes

Throttle Position Sensor

Open or shorted circuit

Vehicle Speed Sensor (36)
or Input Speed Sensor (250)

Open or shorted circuit

Automatic Transmission
Fluid Pressure (TFP) (69)

Contamination

Damaged seals

Trans Fluid Temperature
Sensor (Part of 69)

Open or shorted circuit

Engine Coolant
Temperature Sensor

Open or shorted circuit

Pressure Control Solenoid
(377)

Damage to electrical terminals

Contamination

Checks

Causes

Oil Pump Assembly (4)

Stuck pressure regulator valve

Sticking pump slide

Valve Body Assembly (60) Spacer plate or gaskets misassembled, damaged or incorrect
Case (103)

Porous or damaged valve body pad

2-4 Servo Assembly

2-4 accumulator porosity

Damaged servo piston seals

Apply pin damaged or improper length

2-4 Band Assembly

Burned

Anchor pin not engaged

Throttle Position Sensor

Disconnected

Damage

Vehicle Speed Sensor (36)
or Input Speed Sensor (250)

Disconnected

2007 Hummer H3

2007 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - H3

FIRST GEAR RANGE ONLY - NO UPSHIFT

1st Gear Range Only - No Upshift

SLIPS IN FIRST GEAR

Slips in 1st Gear

Damaged

Bolt not tightened

4WD Low Switch

Disconnected

Damaged

Checks

Causes

Control Valve Body (60)

The 1-2 Shift valve is sticking

The spacer plate or gaskets are mispositioned or
damaged

Case (103)

The case to valve body face is damaged or is not flat

Shift Solenoid Valves
(366/368)

Stuck or damaged

Faulty electrical connection

2-4 Servo Assembly (13-28)

The apply passage case is restricted or blocked

Nicks or burrs on the servo pin or on the pin bore in the
case

Fourth servo piston is installed backwards

2-4 Band Assembly (602)

The 2-4 band is worn or damaged

The band anchor pin is not engaged

Checks

Causes

Forward Clutch Assembly
(646-651)

Clutch plates worn

Porosity or damage in forward clutch piston

Forward clutch piston inner and outer seals missing, cut
or damaged

Damaged forward clutch housing

Forward clutch housing retainer and ball assembly not
sealing or damaged

Forward Clutch

Piston seal missing, cut or damaged

2007 Hummer H3

2007 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - H3

SLIPPING OR HARSH 1-2 SHIFT

Slipping or Rough 1-2 Shift

Accumulator (353-358)

Piston out of its bore

Porosity in the piston or valve body

Stuck abuse valve

Input Housing and Shaft
Assembly (621)

Turbine shaft seals missing, cut or damaged

Valve Body (60)

1-2 Accumulator valve stuck

Face not flat, damaged lands or interconnected passages

Spacer plate or gaskets incorrect, mispositioned or
damaged

Low Roller Clutch (678)

Damage to lugs to inner ramps

Rollers not free moving

Inadequate spring tension

Damage to inner splines

Lube passage plugged

Torque Converter (1)

Stator roller clutch not holding

1-2 Accumulator Assembly
(55-57, 104)

Porosity in piston or 1-2 Accumulator cover and pin
assembly

Damaged ring grooves on piston

Piston seal missing, cut or damaged

Valve body to spacer plate gasket at 1-2 Accumulator
cover, missing or damaged

Leak between piston and pin

Broken 1-2 Accumulator spring

Line Pressure

Refer to Oil Pressure High or Low.

2-4 Servo Assembly (13-28) 4th Servo piston in backward

Checks

Causes

Valve Body Assembly (60)

Mislocated valve body to spacer plate checkball or
checkballs.

1-2 Shift valve train stuck due to sediment

Gaskets or spacer plate incorrect, mispositioned or

2007 Hummer H3

2007 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - H3

NO 2-3 SHIFT OR 2-3 SHIFT SLIPS, ROUGH OR HUNTING

No 2-3 Shift or 2-3 Shift slipping, Rough or Hunting

damaged

1-2 Accumulator valve stuck or damaged

Face not flat

4-3 sequence valve stuck or damaged

#1 or #8 checkball missing or mis-located

1-2 accumulator valve bushing rotated 180°

2-4 Servo Assembly (13-28)

Apply pin too long or too short

2nd servo apply piston seal missing, cut or damaged

Restricted or missing oil passages

Servo bore in case damaged

2nd Accumulator (55-57,
104)

Porosity in 1-2 accumulator cover or piston

Piston seal or groove damaged

Nicks or burrs in 1-2 accumulator housing

Missing or restricted oil passage

1-2 accumulator piston spring not seated

Rough finish in 1-2 accumulator bore in case

A cracked 1-2 accumulator piston - allowing fluid to leak
by

2-4 Band (602)

Worn or mispositioned

Oil Pump Assembly (4) or
Case (103)

Faces not flat

Checks

Causes

Oil Pump (4)

Stator shaft bushings scored or off location

Valve Body Assembly (60)

2-3 Shift valve train stuck

Gaskets or spacer plate incorrect, mispositioned or
damaged

2-3 Accumulator valve stuck

Face not flat

Chips in servo feed oil, orifice #7 in spacer plate

Mislocated valve body to spacer plate checkball or

2007 Hummer H3

2007 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - H3