Engine Mechanical:
Complete overhaul, timing, lubrication, cooling, performance tuning, component replacement.
Engine Electrical:
Ignition system, starting system, charging system, sensors, actuators, ECU diagnostics, wiring schematics.
Emission Control:
PCV system, EGR, catalytic converter, oxygen sensors, evaporative emission control (EVAP), diagnostic trouble codes (DTCs) related to emissions.
Fuel System:
Fuel injection system (MPI), fuel pump, fuel injectors, fuel pressure regulator, fuel filter, evaporative emission controls.
Clutch System:
Clutch disc, pressure plate, release bearing, clutch master cylinder, clutch slave cylinder, hydraulic system troubleshooting.
Manual Transaxle:
Gearbox overhaul, gear selection, clutch engagement, lubrication, component replacement.
Automatic Transaxle:
Transmission fluid, torque converter, valve body, solenoids, shift control, diagnostic procedures, rebuilds.
Driveshaft And Axle:
CV joints, drive axles, constant velocity boots, driveshaft U-joints (if applicable), differential service.
Suspension System:
Struts, shock absorbers, control arms, ball joints, sway bars, bushings, springs, alignment specifications.
Steering System:
Power steering pump, steering rack/gearbox, tie rods, power steering fluid, troubleshooting leaks and assist issues.
Restraint System:
Airbag system, seat belts, SRS warning light troubleshooting, module diagnostics.
Brake System:
Brake pads, rotors, calipers, brake fluid, ABS system, parking brake, bleeding procedures, troubleshooting.
Body Interior Exterior:
Door panels, trim, seats, headliner, bumpers, fenders, body panel removal and installation, corrosion protection.
Body Electrical System:
Lighting, power windows, power locks, wipers, horn, interior lights, dashboard illumination, fuse box diagrams, relay locations.
HVAC System:
Air conditioning compressor, refrigerant, evaporator, condenser, heater core, blower motor, climate control panel, troubleshooting.
Maintenance:
Oil changes, filter replacements, fluid flushes, tune-ups, spark plug replacement, air filter replacement, brake fluid replacement, coolant replacement.
Troubleshooting:
Diagnostic charts, symptom-based troubleshooting, DTC interpretation, electrical system diagnostics, mechanical system diagnostics.
Repair:
Component replacement, engine rebuilds, transmission overhauls, suspension component repair, brake system repair, body panel repair.
Diagnostics:
Step-by-step diagnostic procedures for all major systems, use of diagnostic scan tools.
Wiring Schematics:
Detailed electrical wiring diagrams for all vehicle systems, component locations, and connector pinouts.
Depth:
Comprehensive (mechanic-level) covering routine maintenance to full engine and transmission rebuilds.
Oil Change Interval:
Typical intervals for 2003 GM vehicles were 3,000-7,500 miles or 3-6 months, depending on oil type and driving conditions. The manual would provide precise manufacturer recommendations.
Spark Plug Replacement:
Intervals varied by plug type (copper, platinum, iridium), often ranging from 30,000 to 100,000 miles. The manual would specify the correct type and interval.
Transmission Fluid Change:
Recommended intervals typically ranged from 30,000 to 100,000 miles for automatic transmissions, depending on GM's recommendations at the time. Manual transmissions generally had longer intervals for fluid changes.
Engine Oil Type:
Likely SAE 5W-30 or 5W-40, depending on engine and climate. Specification detailed in the manual.
Coolant Type:
Likely a silicate-inhibited, ethylene glycol-based coolant (e.g., GM Goodwrench 50/50 Coolant). Specification detailed in the manual.
Brake Fluid Type:
DOT 3 or DOT 4 brake fluid is standard for most vehicles of this era. Specification detailed in the manual.
Common Chevrolet Issues 2003:
Depending on the specific platform, common issues for GM vehicles of this era might include transmission solenoid failures (4T60-E/4T65-E), power steering leaks, window regulator failures, HVAC blend door actuator issues, and oil leaks from valve cover gaskets or oil pans. The manual would provide troubleshooting for these and other specific issues.