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/PCM Idle Learn Procedure: Notes
The idle learn procedure must be done so the ECM/PCM can learn the engine idle characteristics.
Do the idle learn procedure whenever you do any of these actions:
- Disconnect the battery.
- Replace the ECM/PCM or disconnect its connector.
- Reset the ECM/PCM.NOTE: Erasing DTCs with the HDS does not require you to do the idle learn procedure.
- Replace the throttle body.
- Replace the idle air control (IAC) valve.
- Remove the No. 6 ECU (ECM/PCM) (15A) fuse from the under-hood fuse/relay box.
- Remove the No. 19 BATTERY (80A) fuse from the under-hood fuse/relay box.
- Remove PGM-FI main relay 1.
- Remove any of the wires from the under-hood fuse/relay box.
- Disconnect any of the connectors from the underhood fuse/relay box.
- Disconnect the connector between the engine compartment wire harness and ECM/PCM wire harness.
- Disconnect the G2 terminal from the transmission housing.
- Disconnect the G1 terminal from the body.
- Disconnect the G101 terminal from the cylinder head cover.
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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