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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 547 (ENGINE IMMOBILIZER SYSTEM - DIAGNOSTICS)CIRCUIT INSPECTIONDTC 99: ENGINE IMMOBILIZER SYSTEM MALFUNCTIONINSPECTION PROCEDURE
2004 Toyota Matrix XR, FWD, Standard

Inspection Procedure

2004 Toyota Matrix XR, FWD, StandardSECTION Inspection Procedure
WARNING: This page is about a different car, the 2003 Toyota Sequoia. However, it is still accessible from the selected car via links, so may be relevant.
  1. Has the ECU communication ID registration been carried out? 
    1. NO : Carry out the ECU communication ID registration again (See  REGISTRATION PROCEDURE  ). 
    2. YES : Go to Next Step 
  2. Check harness and connector between transponder key ECU and ECM (See  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ). 
    1. NG : Repair or replace harness or connector. 
    2. OK : Go to Next Step 
  3. Does it operate normally after replacement of transponder key ECU? 
    1. YES : Replace transponder key ECU. 
    2. No : Check and replace ECM (See  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ). 
RENDER: 1.0x

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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.