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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1 (ENGINE CONTROLS - REMOVAL, OVERHAUL, INSTALLATION)COMPUTERIZED ENGINE CONTROLSFUEL PUMP ELECTRONIC CONTROL UNIT (ECU)REMOVAL & INSTALLATION (SC300 & SC400)
2004 Toyota Matrix XR, FWD, Standard

Removal & Installation (SC300 & SC400)

2004 Toyota Matrix XR, FWD, StandardSECTION Removal & Installation (SC300 & SC400)
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2000 Lexus SC 400, 2000 Lexus SC 300, 2000 Lexus RX 300, 2000 Lexus LX 470, and 2000 Lexus LS 400. However, it is still accessible from the selected car via links, so may be relevant.

Fuel pump ECU is located behind left rear quarter trim panel. See Fig 1. Remove rear seat back and seat cushion to access ECU. Remove scuff plate and left rear quarter trim panel. Disconnect electrical connector at fuel pump ECU. Remove bolt and fuel pump ECU. To install, reverse removal procedure.

Fig 1: Locating Fuel Pump ECU (SC300 & SC400)
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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.