Self-Diagnostic System: Introduction

2004 Toyota Matrix XR, FWD, StandardSECTION Introduction
WARNING: This page is about a different car, the 2002 Lexus ES 300. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Before testing transaxle, ensure fluid level is correct and shift cables are properly adjusted. Ensure engine starts with selector lever in Park and Neutral to ensure proper adjustment of PNP switch. Transaxle must first be tested by checking for stored trouble codes. See RETRIEVING DIAGNOSTIC TROUBLE CODESΒ .

ECM monitors transaxle operation and contains a self-diagnostic system which stores trouble codes if transaxle electronic control system failure or problem exists. Malfunction Indicator Light (MIL) on instrument panel will illuminate to warn driver a malfunction has occurred.

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.