Diagnosis & Repair
WARNING: This page is about a different car, the 2003 Toyota Matrix and 2003 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.
For wiring diagram of Corolla model, see Fig 1. For wiring diagram of Matrix (1ZZ-FE engine) model, see Fig 2. For wiring diagram of Matrix (2ZZ-GE engine) model, see Fig 3. For diagnosis and repair, see Fig 4-Fig 7. For testing of components, see SYSTEM & COMPONENT TESTING - 4-CYLINDER article. For removal and installation of components, see REMOVAL & INSTALLATION - 4-CYLINDER article. To check ECM inputs and outputs, see PIN VOLTAGE CHARTS article. To identify circuits referenced in testing, See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.