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.
ECM Idle Learn Procedure: Notes
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 ECM or disconnect any of its connectors.
- Replace or clean the throttle body.
- Reset ECM.
- Update ECM.NOTE: Erasing DTCs with the HDS does not require the idle learn procedure to be done again.
- Remove the No. 18 (7.5 A) fuse from the under-dash fuse/relay box.
- Remove the No. 2 (80 A) fuse from the under-hood fuse/relay box.
- Remove the No. 7 (15 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 (C103, C502) between the dashboard wire harness and engine wire harness.
- Disconnect the G1 terminal from the transmission housing.
- Adjust the idle speed.
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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