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HOMESERVICE MANUALSLEXUS2005ES 330REPAIR AND DIAGNOSISGENERAL INFORMATIONTOWINGINTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMSELECTRONIC CIRCUIT INSPECTION PROCEDURE
2005 Lexus ES 330

Electronic Circuit Inspection Procedure

2005 Lexus ES 330SECTION Electronic Circuit Inspection Procedure
  1. BASIC INSPECTION 
    1. RESISTANCE MEASURING CONDITION OF ELECTRONIC PARTS
      1. Unless stated, all resistance is measured at an ambient temperature of 20°C (68°F). As the resistance may be outside the specifications if measured at high temperatures immediately after the vehicle has been running, measurements should be made when the engine has cooled down.
    2. HANDLING OF CONNECTOR 
      1. When removing the connector with lock, press the connector in the direction of the engagement and remove the lock by lightly pressing the lock claw.
      2. When removing the connector, do not hold the harness, but hold the connector.
      3. Before connecting the connector, check that there is no deformation, damage or missing terminals.
      4. The connector with a lock should be securely connected until it makes a "click" sound.
      5. When 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 water proof connector cannot be checked from the backside, check by connecting the sub-harness.
      • Do not damage the terminals by moving the inserted tester needle.
    3. CONNECTOR CHECKING POINTS
      1. Checking when the connector is connected:

        By holding the connector, check the inserted condition and locking efficiency (engaged condition).

        Fig 1: Proper Handling Of Connector
        G02936024Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Checking when the connector is removed:

        Check by lightly pulling the wire harness (missing terminal, terminal crimping condition, core wire break).

        Check visually for is any rust, metal particles, water and bent terminals (rust, mixing of foreign object, terminal deformation).

        NOTE: When testing a gold-plated female terminal, always use a gold-plated male terminal.
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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.