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.
1997 Lexus ES 300FACTORY OEM SERVICE PROCEDURE
Engine Controls - System/Component Tests
- Introduction
- Connector Identification
- Acoustic Control Induction System (ACIS)
- Computerized Engine Controls
- Engine Sensors & Switches
- Notes
- Camshaft Sensors
- Crankshaft Sensor
- Exhaust Gas RECIRCULATION (EGR) Temperature Sensor
- Exhaust Gas RECIRCULATION (EGR) Position Sensor
- Engine Coolant Temperature (ECT) Sensor
- Intake Air Temperature (IAT) Sensor
- Knock Sensor
- Mass Airflow (MAF) Sensor
- Oxygen Sensor Heater Resistance
- Oxygen Sensor Operation
- Park/Neutral Position (PNP) Switch
- Park/Neutral Position (PNP) Switch Circuit
- Sub-Throttle Position (Sub-TP) Sensor
- Throttle Position (TP) Sensor
- Vapor Pressure Sensor Circuit
- Vehicle Speed Sensor (VSS) No. 1
- Vehicle Speed Sensor (VSS) No. 1 Circuit (Speedometer Operates)
- Modules, Motors, Relays & Solenoids
- Fuel System
- Idle Control System
- Ignition System
- Emission Systems & Sub-Systems
- Notes
- Exhaust Gas RECIRCULATION (EGR) System
- Exhaust Gas RECIRCULATION (EGR) Position Sensor
- Exhaust Gas RECIRCULATION (EGR) Vacuum Switching Valve (VSV)
- Exhaust Gas RECIRCULATION (EGR) Valve
- Exhaust Gas RECIRCULATION (EGR) Temperature Sensor
- Exhaust Gas RECIRCULATION (EGR) Vacuum Control Valve (VCV)
- Fuel Evaporation
- Positive Crankcase Ventilation (PCV)
- Throttle Controls
- Miscellaneous Controls
Factory Service Tools
Use the Manual With the Right Hardware
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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.
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