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Idle Speed & Mixture: PRIUS

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WARNING: Read service precautions before proceeding with service procedure. See SERVICE PRECAUTIONS .
  1. Idle speed is controlled by Engine Control Module (ECM) and is not adjustable. Check idle speed with engine at normal operating temperature, transaxle in Park, transit in inspection mode, air cleaner and all air intake hoses installed, all vacuum hoses installed, electronic fuel injection system wiring connectors properly installed, ignition timing properly set and A/C and all accessories off.
  2. On this model, the engine is shut off when engine is at normal operating temperature and battery is fully charged and A/C is not turned on. It is necessary to put transit in inspection mode so engine will run continuously when checking idle speed. To put transit in inspection mode, perform the following steps within 60 seconds:
    • Ensure ignition is off and then turn ignition on.
    • Ensure transaxle is in Park and then fully depress accelerator pedal 2 times.
    • Place transaxle in Neutral and then fully depress accelerator pedal 2 times.
    • Place transaxle back in Park and then fully depress accelerator pedal 2 times.
    • Check that master warning light on instrument cluster at center of instrument panel is flashing to indicate inspection mode operation. See Figure. Master warning light may also be referred to as hybrid system error warning light. Turn ignition switch to START position to start engine. Engine will now start and run continuously.
  3. Ensure transaxle is in Park. Warm engine to normal operating temperature. Connect Toyota hand-held tester to data link connector No. 3 at driver's side of instrument panel. See Figure. Hand-held tester is used to read engine RPM.
  4. Maintain engine at 2250 RPM for 90 seconds and then allow engine to idle while noting idle speed. Ensure idle speed is within specification. See IDLE SPEED SPECIFICATIONS  table. Shut engine off. Remove hand-held tester.
  5. If idle speed is not within specification, check air intake system. If air intake system is okay, check throttle body. See IDLE CONTROL SYSTEMS in SYSTEM & COMPONENT TESTING - 4-CYLINDER article.
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