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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 23 (ENGINE CONTROL SYSTEM & COMPONENT TESTING - 4-CYLINDER)IDLE CONTROL SYSTEMSTHROTTLE BODYCAMRY & CAMRY SOLARA
2004 Toyota Matrix XR, FWD, Standard

Camry & Camry Solara

2004 Toyota Matrix XR, FWD, StandardSECTION Camry & Camry Solara
WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 2002 Toyota Tacoma, 2002 Toyota RAV4, 2002 Toyota Prius, 2002 Toyota MR2, and 2002 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.
  1. Electronic Throttle Control System (ETCS) is used for controlling idle speed. ETCS consists of throttle body, accelerator pedal position sensor, Throttle Position (TP) sensor, throttle control motor and Engine Control Module (ECM).
  2. To test throttle control motor operation, turn ignition on. Depress accelerator pedal to operate accelerator pedal position sensor while listing for operating sound at throttle control motor and note that no grinding noise is heard at throttle control motor and throttle body. Accelerator pedal position sensor is located near top of accelerator pedal and throttle control motor is located on the throttle body. See Fig 1.
  3. If throttle control motor operating sound is heard, go to next step. If throttle control motor operating sound is not heard, throttle control motor, wiring harness or ECM may be defective. ECM is located on behind glove box. For illustration of ECM location, see THEORY & OPERATION article. For wiring of throttle control motor, see WIRING DIAGRAMS article. For testing of throttle control motor, go to step  6.
  4. To test accelerator pedal position sensor, turn ignition off. Connect Toyota hand-held tester or scan tool to data link connector No. 3 at driver's side of instrument panel. See Figure and Figure . Turn ignition on. Hand-held tester or scan tool is used to read throttle valve opening which is displayed as a percentage. Ensure Malfunction Indicator Light (MIL) on instrument panel is not illuminated. MIL is displayed as an engine icon. If MIL is not illuminated, go to next step. If MIL is illuminated, a Diagnostic Trouble Code (DTC) may be stored in ECM. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in appropriate SELF-DIAGNOSTICS article for retrieving of DTCs.
  5. Read throttle valve opening on hand-held tester or scan tool by accessing THROTTLE POS under CURRENT DATA. Read throttle valve opening while fully depressing accelerator pedal to operate accelerator pedal position sensor. Throttle valve opening should be 60 percent or more. Turn ignition off. If throttle valve opening is 60 percent or more, go to next step. If throttle valve opening is not at least 60 percent, problem may exist in accelerator position sensor, wiring circuit or ECM. If necessary to check wiring between ECM and accelerator pedal position sensor, see WIRING DIAGRAMS article. ECM is located behind glove box. For illustration of ECM location, see THEORY & OPERATION article. For testing of accelerator pedal position sensor, see ACCELERATOR PEDAL POSITION SENSOR  under ENGINE SENSORS & SWITCHES.
  6. To test throttle control motor, disconnect electrical connector from side of throttle body. See Fig 1. Note electrical terminal identification on throttle body. See Fig 2. Using ohmmeter, check resistance between specified terminals on throttle control motor. See THROTTLE CONTROL MOTOR RESISTANCE  table. If resistance is within specification, reinstall electrical connector. If resistance is not within specification, replace throttle body with throttle control motor as an assembly.
    THROTTLE CONTROL MOTOR RESISTANCE

    Terminal Ohms @ 68°F (20°C)
    M+ & M- .3-100.0
    VC & E2 1.2-3.2
  7. To test Throttle Position (TP) sensor, disconnect electrical connector from side of throttle body. See Fig 1. Note electrical terminal identification on throttle body. See Fig 2. Using ohmmeter, check resistance between VC and E2 terminals on throttle body. Replace throttle body with TP sensor if resistance is not 1200-3200 ohms at 68°F (20°C).
    Fig 1: Locating Electronic Throttle Control System Components On Throttle Body & Accelerator Pedal Position Sensor (Camry & Camry Solara)
    G00025442Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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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.