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 MANUALSHONDA2009S2000 BASEREPAIR AND DIAGNOSISENGINE PERFORMANCEFUEL DELIVERYFUEL AND EMISSIONS SYSTEMS
2009 Honda S2000 Base
Fuel And Emissions Systems
2009 Honda S2000 BaseSECTION Fuel And Emissions Systems
- Special Tools
- General Troubleshooting Information
- Intermittent Failures
- Opens and Shorts
- How to Use the HDS (Honda Diagnostic System)
- HDS Clear Command
- Scan Tool Clear Command
- DTC Clear
- ECM Reset
- Crank (CKP) Pattern Clear/Crank (CKP) Pattern Learn
- How to End a Troubleshooting Session (required after any troubleshooting)
- How to Troubleshoot Circuits at the ECM
- Updating the ECM
- Substituting the ECM
- OBD Status
- DTC Troubleshooting Index
- Symptom Troubleshooting Index
- System Description
- Electronic Control System
- ECM Inputs and Outputs at Connector A (31P)
- ECM Inputs and Outputs at Connector B (24P)
- ECM Inputs and Outputs at Connector D (17P)
- ECM Inputs and Outputs at Connector E (31P)
- Vacuum Hose Routing
- Vacuum Distribution
- PGM-FI System
- Notes
- Air Conditioning (A/C) Compressor Clutch Relay
- Air Fuel Ratio (A/F) Sensor
- Barometric Pressure (BARO) Sensor
- Camshaft Position (CMP) Sensor
- Crankshaft Position (CKP) Sensor
- Engine Coolant Temperature (ECT) Sensor 1/Engine Coolant Temperature (ECT) Sensor 2
- Ignition Timing Control
- Injector Timing and Duration
- Intake Air Temperature (IAT) Sensor
- Knock Sensor
- Malfunction Indicator Lamp (MIL) Indication (In relation to Readiness Codes)
- Manifold Absolute Pressure (MAP) Sensor
- Output Shaft (Countershaft) Speed Sensor
- Secondary Heated Oxygen Sensor (Secondary HO2S)
- Electronic Throttle Control System
- Idle Control System
- Fuel Supply System
- Catalytic Converter System
- Positive Crankcase Ventilation (PCV) System
- Evaporative Emission (EVAP) Control System
- Fuel Cap Warning Message
- To make the message go off (with the HDS)
- To make the message go off (without the HDS) ('06-07 models)
- To make the message go off (without the HDS) ('08-09 models)
- Electronic Throttle Control System Diagram
- Evaporative Emission (EVAP) Control Diagram
- How to Set Readiness Codes
- Malfunction Indicator Lamp (MIL) Indication (In relation to Readiness Codes)
- Catalytic Converter Monitor and Readiness Code
- Evaporative Emission (EVAP) Control System Monitor and Readiness Code
- Air Fuel Ratio (A/F) Sensor Monitor and Readiness Code
- Air Fuel Ratio (A/F) Sensor Heater Monitor Readiness Code
- Misfire Monitor and Readiness Code
- Fuel System Monitor and Readiness Code
- Comprehensive Component Monitor and Readiness Code
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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.