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HOMESERVICE MANUALSTOYOTA2009SIENNA XLE, FWDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROL SYSTEM - DTC P043E/P043F/P2401/P2402/P2419 - P0607DTC P0604 INTERNAL CONTROL MODULE RANDOM ACCESS MEMORY (RAM) ERRORINSPECTION PROCEDURE
2009 Toyota Sienna XLE, FWD

Inspection Procedure

2009 Toyota Sienna XLE, FWDSECTION Inspection Procedure

Read freeze frame data using Techstream. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0604) 
    1. Connect Techstream to the DLC3.
    2. Turn the ignition switch to the ON position.
    3. Turn the tester on.
    4. Select the following menu items: Powertrain / Engine and ECT / Trouble Code.
    5. Read DTCs.

      Result 

      RESULT REFERENCE

      Display (DTC Output) Proceed to
      P0604 A
      No output B

    B: CHECK FOR INTERMITTENT PROBLEMS 

    A: REPLACE ECM 

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.