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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 143 (ENGINE CONTROLS - REMOVAL & INSTALLATION 4-CYLINDER)FUEL SYSTEMSTHROTTLE BODYREASSEMBLY
2004 Toyota Matrix XR, FWD, Standard

Throttle Body: Reassembly

2004 Toyota Matrix XR, FWD, StandardSECTION Reassembly
WARNING: This page does not describe the selected car, but rather 11 other vehicles, including the 2003 Toyota Tacoma, 2003 Toyota RAV4, 2003 Toyota Prius, 2003 Toyota Matrix, and 2003 Toyota MR2. However, it is still accessible from the selected car via links, so may be relevant.
  1. To install accelerator pedal position sensor, install accelerator pedal position sensor on throttle body. Tighten accelerator pedal position sensor bolts to specification. See TORQUE SPECIFICATIONS .
  2. To check accelerator pedal position sensor operation after installation on throttle body, install electrical connector on accelerator pedal position sensor. Connect Toyota hand-held tester or scan tool to data link connector No. 3. See Fig 1.
  3. Turn ignition on. DO NOT depress accelerator pedal or rotate accelerator pedal position sensor after turning ignition on. Using hand-held tester or scan tool, check that ACCEL POS#1 (VPA) voltage of the CURRENT DATA is.3-.9 volt. This is the standard accelerator pedal position sensor voltage. Turn ignition off. Disconnect electrical connector at accelerator pedal position sensor.
  4. To install TP sensor, ensure throttle valve opening on throttle body is about 4 degrees. Install TP sensor on throttle body so it is at position No. 1 (15 degrees) and loosely install TP sensor retaining screws. See Fig 2.
  5. Rotate TP sensor counterclockwise to position No. 2 until it contacts throttle valve and slightly tighten TP sensor retaining screws. See Fig 2.
    6. NOTE: Ensure electrical connector is not installed on accelerator pedal position sensor when checking TP sensor adjustment.
  6. To check TP sensor adjustment after installation on throttle body, install electrical connector on TP sensor. Ensure electrical connector is NOT installed on accelerator pedal position sensor. Connect Toyota hand-held tester or scan tool to data link connector No. 3. See Fig 1. Turn ignition on. DO NOT depress accelerator pedal or rotate accelerator pedal position sensor after turning ignition on when adjusting TP sensor.
  7. Using hand-held tester or scan tool, read the throttle valve opening which is displayed as a percentage. Throttle valve opening may be read by accessing THROTTLE POS under CURRENT DATA on hand-held tester or scan tool.
  8. While reading throttle valve opening, rotate TP sensor clockwise and counterclockwise until throttle valve opening is 15.2 percent, as this is the center of the standard throttle valve opening of 14.4-16.0 percent. Tighten TP sensor retaining screws to specification. See TORQUE SPECIFICATIONS .
  9. When TP sensor retaining screws are tightened, this may cause the throttle valve opening to change. Ensure throttle valve opening remains at 15.2 percent after TP sensor retaining screws are tightened. Readjust TP sensor if necessary.
  10. Ensure throttle valve on throttle body is fully closed. Using hand-held tester or scan tool, read the throttle valve opening again. With throttle valve fully closed, throttle valve opening should be 10-14 percent.
  11. If throttle valve opening is not within specification with throttle valve fully closed, repeat steps  6 through  10 until correct throttle valve opening is obtained.
  12. Turn ignition off. Remove hand-held tester or scan tool. Disconnect electrical connector at TP sensor.
Fig 1: Locating Data Link Connector No. 3 (MR2 With Sequential Manual Transaxle)
G00016686Courtesy 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.