Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 98 (ENGINE CONTROL SYSTEM TESTING & ENGINE COMPONENT TESTING)COMPONENT LOCATIONSCOMPONENT LOCATIONS (3.8L VIN K & 1 - BONNEVILLE & LESABRE)
1999 GMC Forward Control 5.7 R, Automatic
Component Locations (3.8L VIN K & 1 - BONNEVILLE & LESABRE)
1999 GMC Forward Control 5.7 R, AutomaticSECTION Component Locations (3.8L VIN K & 1 - BONNEVILLE & LESABRE)
WARNING: This page does not describe the selected car, but rather 31 other vehicles, including the 2002 Saturn SL2, 2002 Saturn SL1, 2002 Saturn SL, 2002 Saturn SC2, and 2002 Saturn SC1. However, it is still accessible from the selected car via links, so may be relevant.
COMPONENT LOCATIONS (3.8L VIN K & 1 - BONNEVILLE & LESABRE)
| Component | Location |
|---|---|
| A/C Compressor Clutch Relay | On Front Right Side Of Engine Compartment, In Underhood Junction Block |
| A/C Refrigerant Pressure Sensor | Front Side Of Engine, On A/C Line Behind A/C Compressor |
| Body Control Module | Under Right Side Of Instrument Panel |
| Camshaft Position Sensor | Right Side Of Engine, Below Water Pump |
| Crankshaft Position Sensor | Lower Right Side Of Engine, Behind Crankshaft Pulley |
| Cruise Control Module | Left Side Of Engine Compartment, On Left Strut Tower |
| Data Link Connector | Under Left Side Of Instrument Panel |
| EGR Valve | On Top Of Engine, Rear Of Intake Manifold |
| Electronic Brake Traction Control Module | Front Left Lower Corner Of Engine Compartment, Under Air Cleaner Housing |
| Engine Coolant Temperature Sensor | Left Front Of Engine, Under Thermostat Housing |
| Engine Cooling Fan Relays (High & Low) | Center Rear Of Engine Compartment, Below Left Junction Block |
| Engine Oil Level Switch | Front Of Engine, In Oil Pan |
| EVAP Canister Purge Solenoid | On Top Of Engine Front Of Intake Manifold |
| EVAP Canister Vent Solenoid | Left Front Corner Of Engine Compartment, On Top Of Vapor Canister |
| Fuel Injectors | In Intake Manifold |
| Fuel Tank Pressure Sensor | In Fuel Tank |
| Fuel Pump Relay | Under Left Side Of Rear Passenger Compartment Seat, In Fuse Block |
| Idle Air Control Valve | Left Of Engine, In Top Of Throttle Body |
| Ignition Control Module | Top Left Front Of Engine |
| Intake Air Temperature Sensor | On Top Of Air Intake Hose between Throttle Body & Air Cleaner Housing |
| Knock Sensor (Bank No. 1) | Front Of Engine, Above Starter |
| Knock Sensor (Bank No. 2) | Rear Of Engine |
| Left Instrument Panel Fuse Block | Left Side Of Instrument Panel |
| Manifold Absolute Pressure Sensor | Top Of Engine, Rear Of Intake Manifold |
| Mass Airflow Sensor | Top Right Side Of Engine, On Throttle Body |
| Post-Converter Oxygen Sensor | Rear Of Catalytic Converter |
| Powertrain Control Module | Left Front Of Engine Compartment, In Air Cleaner Housing |
| Pre-Converter Oxygen Sensor | Front Of Engine, In Exhaust Manifold |
| Supercharger Boost Control Solenoid | Front Top Of Engine, Left Of Termostat Housing |
| Supercharger Bypass Valve Actuator | Front Top Of Engine, Left Of TPS |
| Throttle Position Sensor | Center Left Of Engine, On Throttle Body |
| Transaxle Range Switch | Left Side Of Transaxle, Below EGR Valve |
| Underhood Fuse Block | Front Right Side Of Engine Compartment |
| Vehicle Speed Sensor | Top Right Side Of Transaxle |
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.