Idle Speed

NOTE: Check and adjust idle speed with air cleaner installed, all air intake system hoses and vacuum lines connected, electronic fuel injection system wiring connectors properly installed, transmission/transaxle in Neutral, ignition timing properly set, electric cooling fan off (if equipped), A/C and all accessories off, and engine at normal operating temperature.

Start and warm engine to normal operating temperature. Shut engine off. Remove cover (if equipped) and connect scan tool to data link connector No. 3. See Figure. Scan tool is used to read engine RPM.
Apply parking brake. Place transmission/transaxle in Neutral. Start engine and maintain engine at 2500 RPM for 90 seconds and then allow engine to idle. Ensure idle speed is within specification. See IDLE SPEED SPECIFICATIONS table.
If idle speed is not within specification, check Idle Air Control (IAC) valve, wiring and Electronic Control Module (ECM). See IDLE CONTROL SYSTEM in appropriate SYSTEM/COMPONENT TESTS article:
- 1.6L, see: SYSTEM/COMPONENT TESTS - 1.6L
- 1.8L, see: SYSTEM/COMPONENT TESTS - 1.8L

Shut engine off. Remove scan tool.

IDLE SPEED SPECIFICATIONS ⁽¹⁾

Application

RPM

Corolla

650-750

⁽¹⁾	Check with engine at normal operating temperature, transmission/transaxle in Neutral, parking brake applied, air cleaner and all vacuum hoses installed, ignition timing properly set, electric cooling fan off (if equipped) and A/C and all accessories off.