Relearn the Idle (Idle Air Volume Learning)

Last updated: June 10, 2026

If your Nissan Micra (K14, 2017–present) idles rough, surges, or hangs high after a 12-volt battery disconnect or a throttle-body clean, the petrol engine has lost its learned idle-air setting. The fifth-generation Micra’s petrol engines (1.0 IG-T HR10DDT, 0.9 IG-T, 1.0 HR10DE) use a fully electronic throttle with no idle screw — the ECM teaches itself the idle-air volume, and that learned value is erased whenever power is cut to the throttle actuator or the engine computer. The fix is Nissan’s Idle Air Volume Learning relearn, an owner pedal sequence that needs no scan tool.

When you need the idle relearn

• The 12-volt battery was disconnected or went flat (see our Micra K14 battery disconnect/reconnect guide).
• The throttle body was cleaned, removed, or unplugged.
• The ECM was replaced or its connector disturbed.
• Idle is hunting or sitting high, or you have a stored P0507 high-idle code.

This applies to the petrol K14 Micra. It is non-destructive — a missed step just means the relearn doesn’t complete and you start over, with nothing harmed.

Pre-conditions — all must be true

• Engine fully warmed to operating temperature (70–100 °C) — drive 10–15 minutes first; the relearn won’t take on a cold engine.
• Battery above 12.9 V at idle — the most common reason the relearn fails on the K14 is a tired or just-reconnected battery.
• Selector in Neutral (the Micra is manual; on the auto, P or N), handbrake on.
• All loads OFF: A/C, lights, heated rear screen, blower, radio.
• Front wheels straight ahead.
• A stopwatch ready — five pedal presses inside five seconds is the tight window.

The full Idle Air Volume Learning relearn

1. Stage 1 — Accelerator Pedal Released Position Learning. Pedal fully released, ignition ON (engine off), wait at least 2 seconds, ignition OFF, wait at least 10 seconds. Repeat the ON/OFF cycle once more.
2. Stage 2 — Throttle Valve Closed Position Learning. Pedal released, ignition ON, then OFF, wait at least 10 seconds. You should hear the throttle motor cycling during those 10 seconds — that confirms it took.
3. Stage 3 — Idle Air Volume Learning (the pedal dance). Start the warm engine and idle it, then turn ignition OFF and wait at least 10 seconds. Confirm the pedal is fully released, turn ignition ON and wait exactly 3 seconds. Fully depress and fully release the accelerator 5 times within 5 seconds — full strokes, on the stopwatch. Wait about 7 seconds, then hold the pedal flat to the floor. After roughly 20 seconds the blinking engine warning light stops blinking and glows steady. Release the pedal within 3 seconds of it going steady.
4. Start the engine and let it idle. Blip the throttle two or three times and confirm idle settles smoothly to around 700 rpm.

If the idle is still rough

• The light never blinked in Stage 3 — a timing window was missed. Switch off and restart from Stage 1.
• Weak or just-reconnected battery — charge fully above 12.9 V and retry. This is the single most common cause on the K14.
• Slight drift for the first minutes, then settles — normal; drive a short mixed cycle.
• Persistent surge on the turbo IG-T — check the charge-air and PCV hoses for a leak disturbed during the work, and confirm the throttle plate is clean.

Frequently Asked Questions

Does the Micra K14 need a scan tool for the idle relearn?

No. The pedal-sequence Idle Air Volume Learning is Nissan’s owner method for the petrol Micra and needs no CONSULT or aftermarket tool.

Why does my Micra idle high after a battery disconnect?

The disconnect erased the ECM’s learned idle-air volume. Until it relearns, the throttle holds a default opening that is too high, so the engine sits at 1,200 rpm or more and hunts. The relearn restores the correct value.

Does the naturally aspirated 1.0 relearn the same way as the turbo IG-T?

Yes — the three-stage pedal sequence is identical across the K14 petrol range. The pre-conditions and timing are the same regardless of whether your Micra is turbocharged.

The relearn worked but idle still wanders slightly. Normal?

A brief wander while fuel trims re-adapt is normal; a 10-minute drive clears it. Lasting surge points to a vacuum leak or a dirty throttle.

Can I damage the engine if the pedal timing is wrong?

No. A mistimed sequence simply fails to complete — the light won’t go steady — and you start over. The relearn writes only the idle-air value.

If a throttle or idle code such as P0507 or a throttle-position fault stays stored after the relearn, look up what it means and which part it points to at autodtcs.com.