Repair manual
Wiring diagrams
Buick LaCrosse I Repair Manual
Step-by-step repair and maintenance instructions for the Buick LaCrosse I (2004–2009): removal, installation, adjustment, diagnostics and parameter checks with illustrations.
- Transmission Fluid Temperature (TFT) Sensor Specifications
- Fastener Tightening Specifications
- Transmission General Specifications
- Fluid Capacity Specifications
- Range Reference
- Shift Solenoid Valve State and Gear Ratio
- Shift Speed
- Transmission Internal Mode Switch Logic
- Line Pressure
- Component Resistance
- Automatic Transmission Schematic Icons
- Automatic Transmission Inline 20-Way Connector End View (3.6L)
- Automatic Transmission Inline 20-Way Connector End View (3.8L)
- Automatic Transmission Internal Connector End Views
- Automatic Transmission Related Connector End Views
- DIAGNOSTIC CODE INDEX
- Transmission Control Module (TCM) Replacement (3.8L)
- Removal Procedure
- Installation Procedure
- Automatic Transmission Range Selector Cable Adjustment
- Park Lock Cable Adjustment
- Tools Required
- Tool Required
- Transmission Mount Inspection
- How to Use This Section
- Basic Knowledge
- Diagnosis
- Transmission General Description
- Transmission Component and System Description
- Transmission Adaptive Functions
- Upshift Adapts (1-2, 2-3 and 3-4)
- Steady State Adapts
- Clearing Transmission Adaptive Pressure (TAP) or Reset Transmission Adapts
- Special Tools
- Fastener Tightening Specifications
- End Play Specifications
- Transfer Case Selective Washer Specifications
- Transmission General Specifications
- Fluid Capacity Specifications
- Model Build Information (MN7)
- Model Build Information (M15)
- Model Build Information (M76)
- Torque Converter Assembly Removal
- Tools Required
- Procedure
- Removal Procedure
- Inspection Procedure
- Disassembly Procedure
- Checking Procedure
- Tool Required
- Assembly Procedure
- Installation Procedure
- Cleaning Procedure
- Adjustment Procedure
- Park or Neutral - Engine Running (Park - Without Touch Activated Power)
- Pressure Regulator Valve (313)
- Actuator Feed Limit Valve (414)
- Pressure Control (PC) Solenoid Valve (322)
- Torque Signal Regulator Valve (321)
- Line Pressure Relief Valve (324)
- Manual Valve (404)
- Transmission Fluid Pressure (TFP) Manual Valve Position Switch Assembly (34)
- 1-2, 3-4 Shift Solenoid Valve (315A)
- 2-3 Shift Solenoid Valve (315B)
- 1-2 Shift Valve (318)
- 2-3 Shift Valve (357)
- 1-2, 2-3 and 3-4 Accumulator Valves (350, 344, 341)
- 1-2, 2-3 and 3-4 Accumulator Assemblies
- Pressure Regulator Valve (313) (Torque Converter/Cooler and Lube Circuits)
- TCC Control Valve (335)
- Park or Neutral - Engine Running (Park - With Touch Activated Power)
- Park or Neutral - Engine Running (Neutral-Without Touch Activated Power)
- Reverse Band Assembly (615)
- Park or Neutral - Engine Running (Neutral - With Touch Activated Power)
- Reverse (Without Touch Activated Power)
- Number 5 Ball Check Valve (373)
- Reverse Servo Assembly (39-40)
- Input Clutch
- Reverse (With Touch Activated Power)
- Overdrive Range, First Gear (Without Touch Activated Power)
- Number 6 Ball Check Valve (372)
- Forward Servo Assembly (15-22)
- Forward Band Assembly (688)
- 1-2 Shift Solenoid (SS) Valve (315A)
- 2-3 Shift Solenoid (SS) Valve (315B)
- 1-2 Support Roller Clutch
- Overdrive Range, First Gear (With Touch Activated Power)
- Overdrive Range, Second Gear (Without Touch Activated Power)
- 1-2, 3-4 Shift Solenoid (SS) Valve (315A)
- Number 2 Ball Check Valve (372)
- Second Clutch
- Input Sprag Clutch
- Forward Band
- 1-2 Accumulator
- 1-2 Accumulator Valve
- TCC Control Pulse Width Modulated (PWM) Solenoid Valve
- Torque Converter Clutch
- Transmission Fluid Pressure (TFP) Manual Valve Position Switch
- Overdrive Range, Second Gear (With Touch Activated Power)
- Overdrive Range, Third Gear - Torque Converter Clutch Not Applied (Without Touch Activated Power)
- 2-3 Shift Solenoid (SS) Valve (315)
- Number 9 Ball Check Valve (372)
- Number 4 Ball Check Valve (372)
- Third Clutch
- Third Roller Clutch
- 2-3 Accumulator
- 2-3 Accumulator Valve
- Overdrive Range, Third Gear - Torque Converter Clutch Not Applied (With Touch Activated Power)
- Overdrive Range, Fourth Gear - Torque Converter Clutch Not Applied (Without Touch Activated Power)
- 1-2, 3-4 Shift Solenoid (SS) Valve (315)
- 3-4 Shift Valve (362)
- Fourth Clutch
- 3-4 Accumulator
- 3-4 Accumulator Valve
- Overdrive Range, Fourth Gear - Torque Converter Clutch Not Applied (With Touch Activated Power)
- Overdrive Range, Fourth Gear - Torque Converter Clutch Applied (Without Touch Activated Power)
- TCC Control (PWM) Solenoid
- TCC Regulator Valve
- TCC Control Valve
- Cooler Check Valve
- Number 1 Ball Check Valve (372)
- Converter Clutch Blow-off Valve
- Overdrive Range, Fourth Gear - Torque Converter Clutch Applied (With Touch Activated Power)
- Overdrive Range, 4-3 Downshift - Torque Converter Clutch Not Applied (Without Touch Activated Power)
- Pressure Control (PC) Solenoid
- Pressure Regulator Valve
- TCC Control (PWM) Solenoid Valve
- Overdrive Range, 4-3 Downshift - Torque Converter Clutch Not Applied (With Touch Activated Power)
- Drive Range, Manual Third (from Overdrive Range) (Without Touch Activated Power)
- Manual Valve
- Number 3 Ball Check Valve (372)
- Manual Third-Second and First Gears
- Manual Third Gear (With Touch Activated Power)
- Drive Range, Manual Second (from Drive, Manual Third) (Without Touch Activated Power)
- Number 8 Ball Check Valve (372)
- Manual 2-1 Servo Assembly (104-115)
- 3-2 Manual Downshift Valve (356)
- Manual Second Gear (With Touch Activated Power)
- Drive Range, Manual First (from Drive, Manual Second) (Without Touch Activated Power)
- Number 7 Ball Check Valve (372)
- Lo Blow Off Valve (407)
- Manual First Gear (With Touch Activated Power)
- Lo Blow Valve (443)
- Special Tools
- Fastener Tightening Specifications
- Engine Mechanical Specifications
- Sealers, Adhesives and Lubricants
- Vehicle Identification Number
- Engine Traceability Label
- Engine Verification Label
- Diagnostic Starting Point - Engine Mechanical
- Strategy Based Diagnostics
- Visual/Physical Inspection
- Intermittent
- Symptom List
- Base Engine Misfire without Internal Engine Noises
- Base Engine Misfire with Abnormal Internal Lower Engine Noises
- Base Engine Misfire with Abnormal Valve Train Noise
- Base Engine Misfire with Coolant Consumption
- Base Engine Misfire with Excessive Oil Consumption
- Engine Noise on Start-Up, but Only Lasting a Few Seconds
- Upper Engine Noise, Regardless of Engine Speed
- Lower Engine Noise, Regardless of Engine Speed
- Engine Noise Under Load
- Engine Will Not Crank - Crankshaft Will Not Rotate
- Coolant in Combustion Chamber
- Coolant in Engine Oil
- Tools Required
- Procedure
- Test Procedure
- Oil Consumption Diagnosis
- Oil Leak Diagnosis
- Crankcase Ventilation (CV) System Inspection
- Results of Incorrect Operation
- Diagnostic Aids
- Test Description
- Drive Belt Tensioner Diagnosis
- Drive Belt System Description
- Engine Component Description
- Crankcase
- Crankshaft
- Connecting Rods and Pistons
- Camshaft Drive System
- Camshaft Position Actuator System
- Cylinder Heads
- Induction System
- Right and Left Bank Designation
- New Product Information
- Torque Values and/or Fastener Tightening Strategies
- Changed Engine Specifications
- New Sealants and/or Adhesives
- Disassembly and Assembly Procedure Revisions
- Engine Mechanical Diagnostic Procedure Revisions
- New Special Tools Required
- A Component Comparison from the Previous Year
- Lubrication Description
- Cleanliness and Care
- Separating Parts
- Gasket Reuse and Applying Sealant
- Separating Components
- Cleaning Gasket Surfaces
- Assembling Components
- Sealant Types
- Anaerobic Type Room Temperature Vulcanizing (RTV) Sealant
- Anaerobic Type Gasket Eliminator Sealant
- Anaerobic Type Threadlock Sealant
- Anaerobic Type Pipe Sealant
- Tools and Equipment
- Special Tools