Hummer H3. Manual — part 736

HARSH GARAGE SHIFT

Harsh Garage Shift

NO OVERRUN BRAKING - MANUAL 3-2-1

No Overrun Braking - Manual 3-2-1

NO TORQUE CONVERTER CLUTCH APPLY (300 RPM SLIP)

No Torque Converter Clutch (TCC) Apply

Oversized housing

Lo and Reverse Clutch
(694-696)

Clutch plates worn

Porosity in piston

Seals damaged

Return spring assembly retaining ring mispositioned

Restricted apply passage

Checks

Causes

Valve Body Assembly (60)

Orifice cup plug missing

Checkball missing

Checks

Causes

External Linkage

Not adjusted properly

Valve Body Assembly (60)

4-3 Sequence valve stuck

Checkball mispositioned

Spacer plate and gaskets incorrect, damaged or
mispositioned

Overrun and Forward
Clutch Assembly (644-651)

Turbine shaft oil passages plugged or not drilled

Turbine shaft seal rings damaged

Turbine shaft sealing balls loose or missing

Porosity in forward or overrun clutch piston

Overrun piston seals cut or damaged

Overrun piston checkball not sealing

Checks

Causes

Valve Body Assembly (60)

Regulator apply valve side loading

2007 Hummer H3

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

Stuck converter clutch valve

Torque converter clutch (TCC) apply valve stuck closed
(debris in bore)

Torque converter clutch pulse width modulated (TCC
PWM) solenoid broken/cracked

Turbine shaft O-ring omitted

TCC PWM solenoid leaking

Input Housing and Turbine
Shaft Assembly (621)

Turbine shaft hole not drilled to full depth

Scratched turbine shaft journals

Turbine shaft O-ring omitted/damaged

Turbine shaft retainer and ball assembly restricted or
damaged

Electrical

12 volts not supplied to transmission

Outside electrical connector damaged

Inside electrical connector damaged

Wire harness damaged

TCC solenoid damaged

Electrical short (pinched wire)

TCC solenoid not grounded

Torque Converter Clutch
(1)

Internal damage (blue or distorted)

Oil Pump Assembly (4)

TCC spring cocked

Orifice cup plug restricted or damaged

Pump to case gasket mispositioned

Converter clutch valve retaining ring mispositioned

Converter clutch valve stuck or assembled backward

Transmission Fluid Pressure
Manual Valve Position
Switch (69)

Contamination

Damaged seals

Solenoid Screen
(367A/367B)

Blocked

TCC Solenoid Valve (Part
of 66)

Internal damage

Engine Speed Sensor

Internal damage

2007 Hummer H3

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

TORQUE CONVERTER CLUTCH SHUDDER

Torque Converter Clutch Shudder

NO TORQUE CONVERTER CLUTCH RELEASE

No TCC Release

Engine Coolant
Temperature Sensor

Internal damage

Automatic Transmission
Fluid Temperature Sensor
(Part of 69)

Internal damage

Brake Switch

Internal damage

TCM

Internal damage

TCC PWM Solenoid (Part
of 66)

Internal damage

Checks

Causes

Miscellaneous

Low oil presure

Engine not tuned properly

Contaminated transmission oil

Oil Filter (72)

Crack in filter body

Flash restricting filter neck

O-ring seal (71) cut or damaged

Torque Converter Assembly
(1)

Internal damage

Broken weld or missing weight

Oil Pump Assembly (4)

Converter clutch valve (224) stuck

Restricted oil passage

Input Housing and Shaft
Assembly (621)

Turbin shaft O-ring (618) cut or damaged

Turbin shaft retainer and ball assembly (617) restricted
or damaged

Checks

Causes

TCC Solenoid Valve (Part
of 66)

External ground

Clogged exhaust orifice

Converter (1)

Internal damage

2007 Hummer H3

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

TORQUE CONVERTER CLUTCH SLIP - 100 RPM SLIP

TCC Slip (100 RPM)

TORQUE CONVERTER CLUTCH SLIP WITH STALL/STUMBLE

TCC Slip with Stall/Stumble

TORQUE CONVERTER CLUTCH INTERMITTENT - OK COLD/SLIPS HOT

Intermittent TCC OK Cold/Slips Hot

NO FOURTH GEAR OR SLIPS IN FOURTH GEAR

Valve Body Assembly (60) The converter clutch apply valve is stuck in the apply position
Oil Pump Assembly (4)

The converter clutch valve is stuck

PCM/TCM

External ground

Checks

Causes

Valve Body Assembly (60)

TCC/PWM solenoid leaks

Regulator apply valve or converter clutch shift valve
sticking or side loading

Oil Pump Assembly (4)

Stator shaft bushings worn, due to scratched turbine shaft
journal (replace bushings and input housing assembly)

TCC apply valve is stuck open

TCC solenoid leaking

Input Housing and Turbine
Shaft Assembly (621)

Scratched journal on turbine shaft

Turbine shaft O-ring cut

Turbine shaft hole not drilled to full depth

Checks

Causes

TCC Apply Valve (Part of
66)

Stuck open

Checks

Causes

TCC PWM Solenoid (396) Leaks
Regulator Apply Valve
(216)

Sticking valve

Converter Clutch Shift
Valve (224)

Sticking valve

2007 Hummer H3

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