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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 39 (ENGINE CONTROLS - SELF-DIAGNOSTICS)DIAGNOSTIC TESTSDTC P0505: IDLE AIR CONTROL (IAC) SYSTEM CIRCUITCIRCUIT DESCRIPTION
2004 Toyota Matrix XR, FWD, Standard

Circuit Description

2004 Toyota Matrix XR, FWD, StandardSECTION Circuit Description
WARNING: This page is about a different car, the 2002 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.

Idle speed is controlled by Electronic Throttle Control System (ETCS). Description of ECTS components are as follows:

  • Throttle motor is used to operate throttle valve.
  • Magnetic clutch is used to connect throttle motor with throttle valve.
  • Throttle position sensor is used to detect opening angle of throttle valve.
  • Accelerator pedal position sensor is used to detect accelerator pedal position.
  • Engine Control Module (ECM) controls ETCS.

DTC is set when idle speed continues to vary greatly from target speed. Possible causes are:

  • Defective ETCS.
  • Leaking air induction system.

RENDER: 1.0x

NO RELATED

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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.