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 MANUALSSATURN2000LW2 AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCETHEORY AND OPERATIONENGINE CONTROL SYSTEM - THEORY & OPERATION
2000 Saturn LW2 Automatic
Engine Control System - Theory & Operation
2000 Saturn LW2 AutomaticSECTION Engine Control System - Theory & Operation
- Introduction
- Air Induction System
- Computerized Engine Controls
- Notes
- Powertrain Control Module
- Input Devices
- Notes
- A/C Request Signal
- A/C Pressure Sensor
- A/C Pressure Switches
- A/C Temperature Sensors
- Accelerator Pedal Position Sensor
- Battery Voltage
- Brake Switch Feedback
- Camshaft Position Sensor (2.2L & 2.4L - Cavalier & Sunfire)
- Camshaft Position Sensor (3.1L & 3.4L)
- Camshaft Position Sensor (3.5L)
- Camshaft Position Sensor (3.8L)
- Camshaft Position Sensor (4.6L)
- Camshaft Position Sensor (5.7L)
- Crankshaft (7X) Sensor (2.2L & 2.4L)
- Crankshaft (3X/7X) Sensor (3.1L)
- Crankshaft (24X) Sensor (3.1L & 3.4L)
- Crankshaft (3X/18X) Sensor (3.8L)
- Crankshaft (4X/24X) Sensor (5.7L)
- Crankshaft Position Sensor
- Engine Coolant Temperature Sensor
- Engine Coolant Level Switch
- Engine Oil Level Switch
- Engine Oil Pressure Sensor
- Engine Oil Pressure Switch
- Fuel Level Sensor
- Fuel Pump Feedback
- Fuel Tank Vapor Pressure Sensor
- Gear Switches
- Generator "L" Light Circuit
- Generator "F" Field Circuit
- Ignition/Crank Signal
- Intake Air Temperature Sensor
- Knock Sensor
- Manifold Absolute Pressure Sensor
- Mass Airflow Sensor
- Oxygen Sensor
- Park/Neutral Position Switch
- Power Steering Pressure Switch
- RPM Reference Signal
- Throttle Position Sensor
- Throttle Position Switch
- Transmission Fluid Temperature Sensor
- Transmission Range Switch
- Vehicle Speed Sensor
- Output Signals
- Notes
- A/C Compressor Clutch
- Air Injection System
- Boost Control Solenoid (Supercharger)
- Canister Purge Control Solenoid
- Coil-Near-Plug (CNP) Ignition
- Computer Controlled Coil Ignition (C I)
- Cooling Fan Relay
- Digital EGR Valve
- Direct Ignition System (DIS)
- EGR Control Solenoid
- Electronic Variable Orifice (EVO) Actuator
- Fuel Injectors
- Fuel Pump & Fuel Pump Relay
- HOT Light Or Coolant Temperature (TEMP) Light
- Idle Air Control (IAC) Valve
- Integrated Direct Ignition (IDI)
- Linear EGR Valve
- Knock Sensor Operation
- Malfunction Indicator Light (MIL)
- Self-Diagnostics
- Serial Data
- Shift Light
- Shift Solenoids (Electronically-Controlled Transmission)
- Throttle Actuator
- Torque Converter Clutch
- Fuel System
- Ignition System
- Emission Systems
- Self-Diagnostic System
- Throttle Actuator Control System
- Miscellaneous Controls
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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.