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 DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 3 (IDLE CONTROL SYSTEM)ECM IDLE LEARN PROCEDURENOTES
2009 Honda S2000 Base
ECM Idle Learn Procedure: Notes
2009 Honda S2000 BaseSECTION Notes
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2005 Honda S2000, 2004 Honda S2000, 2003 Honda S2000, 2002 Honda S2000, and 2001 Honda S2000. However, it is still accessible from the selected car via links, so may be relevant.
The idle learn procedure must be done so that the ECM can learn the engine idle characteristics.
Do the idle learn procedure whenever you do any of these actions:
- Disconnect the battery.
- Replace the ECM or disconnect its connector.
- Reset the ECM.NOTE: Erasing DTCs with HDS does requires the idle learn procedure to be done again.
- Remove the No. 6 ECU (ECM) (15 A) fuse from the under-dash fuse/relay box.
- Remove the No. 41 BATTERY (100 A) fuse from the under-hood fuse/relay box.
- Remove the PGM-FI main relay.
- Remove the battery wire from the under-hood fuse/relay box.
- Disconnect any of the connectors from the under-hood fuse/relay box.
- Disconnect the connector (C404) between the dashboard wire harness A and dashboard wire harness B.
- Disconnect the G1 terminal.
- Adjust the idle speed.
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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.