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HOMESERVICE MANUALSTOYOTA20094RUNNER LIMITED, 4.0 U, 4WDREPAIR AND DIAGNOSISBODY & FRAMEDOOR LOCKSTHEFT DETERRENTTHEFT DETERRENT SYSTEMCIRCUIT TESTECU POWER SOURCE CIRCUITINSPECTION PROCEDURE
2009 Toyota 4Runner Limited, 4.0 U, 4WD

Inspection Procedure

2009 Toyota 4Runner Limited, 4.0 U, 4WDSECTION Inspection Procedure
  1. INSPECT FUSE (ECU-B) 
    1. Remove the ECU-B fuse from the engine room J/B.
    2. Measure the resistance.

      Standard resistance: Below 1 Ω 

    NG: REPLACE FUSE 

    OK: GO TO NEXT STEP 

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE) 
    1. Remove the T5 ECU assembly with the connector still connected.
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      HARNESS AND CONNECTOR (POWER SOURCE)

      Symbol (Tester Connection) Specified Condition
      +B1 (T5-2) - Body ground 10 to 14 V
      Fig 1: Identifying Theft Warning ECU Assembly Connector Terminals
      G04966209Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    NG: GO TO NEXT STEP 

  3. CHECK HARNESS AND CONNECTOR (GROUND) 
    1. Disconnect the T5 ECU connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      HARNESS AND CONNECTOR (GROUND)

      Symbol (Tester Connection) Specified Condition
      E (T5-29) - Body ground Below 1 Ω
      Fig 2: Identifying Theft Warning ECU Assembly Connector Terminals
      G04966209Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE THEFT WARNING ECU ASSEMBLY 

RENDER: 1.0x

NO RELATED

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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.