Idle Speed & Mixture

NOTE: Mixture adjustment is not possible on any model.

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 tight, transmission 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 and connect scan tester to data link connector No. 3. See Figure. Scan tester is used to read engine RPM.
Apply parking brake. Place transmission 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 TESTING article. Shut engine off. Remove scan tester.

IDLE SPEED SPECIFICATIONS ⁽¹⁾

Application

RPM

Land Cruiser

600-700

⁽¹⁾	Check with engine at normal operating temperature, transmission in Neutral, parking brake applied, ignition timing properly set, and with A/C and all accessories off.