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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 680 (INTRODUCTION)HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMSELECTRONIC CIRCUIT INSPECTION PROCEDURE
2004 Toyota Matrix XR, FWD, Standard

Electronic Circuit Inspection Procedure

2004 Toyota Matrix XR, FWD, StandardSECTION Electronic Circuit Inspection Procedure
WARNING: This page is about a different car, the 2004 Toyota Camry Solara. However, it is still accessible from the selected car via links, so may be relevant.
  1. BASIC INSPECTION 
    1. RESISTANCE MEASURING CONDITION OF ELECTRONIC PARTS
      1. Unless stated, all resistance measurements should be made at an ambient temperature of 20°C (68°F). Resistance measurements may be outside the specifications if measured at high temperatures, i.e. immediately after the vehicle has been running. Measurements should be made after the engine has cooled down.
    2. HANDLING CONNECTORS
      1. When disconnecting a connector, first squeeze the mating halves tightly together to release the lock, then press the lock claw and separate the connector.
        Fig 1: Disconnecting Connector
        G03035138Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. When disconnecting a connector, do not pull on the harnesses. Grasp the connector directly and separate it.
      3. Before connecting the connector, check that there are no deformed, damaged, loose or missing terminals.
      4. When connecting a connector, press firmly until you hear the lock close with a "click" sound.
      5. If checking the connector with a TOYOTA electrical tester, check it from the backside (harness side) of the connector using a mini test lead.
      NOTE:
      • As a waterproof connector cannot be checked from the backside, check by connecting a sub-harness. 
      • Do not damage the terminals by moving the inserted tester needle. 
    3. CHECKING CONNECTORS
      1. Checking when the connector is connected: Squeeze the connector together to confirm that it is fully inserted and locked.
      2. Checking when the connector is disconnected: Check by pulling the wire harness lightly from the backside of the connector. Look for unlatched terminals, missing terminals, loose crimps or broken conductor wires.

        Check visually for corrosion, metallic or foreign objects and water; and bent, rusted, overheated, contaminated, and deformed terminals.

        Fig 2: Checking Connectors
        G03035139Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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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.