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Home >> Lexus >> 2007 >> RX 400h FWD >> Repair and Diagnosis >> Engine Performance >> Engine Control System >> SFI System >> DTC P0606 ECM / PCM Processor >> Inspection Procedure
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Inspection Procedure

  1. INSPECT FOR EXHAUST GAS LEAK 
    1. Allow the engine to idle.
    2. Check for exhaust gas leaks around the heated oxygen sensor.

      OK: No leak from the heated oxygen sensor. 

    NG: REPAIR OR REPLACE EXHAUST GAS LEAKAGE POINT 

    OK: Go to next step 

  2. CHECK HEATED OXYGEN SENSOR 
    1. Connect the intelligent tester to the DLC3.
    2. Start the engine and turn the tester on.
    3. Warm up the engine at an engine speed of 2500 rpm for approximately 90 seconds.
    4. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / A/F CONTROL.
    5. Perform the A/F CONTROL operation with the engine in an idling condition (press the RIGHT or LEFT button to change the fuel injection volume).
    6. Monitor the voltage outputs of the HO2 sensors (O2S B1S2) displayed on the tester.

      HINT:

      • The A/F CONTROL operation lowers the fuel injection volume by 12.5% or increases the injection volume by 25%.
      • Each sensor reacts in accordance with increases in the fuel injection volume.

      Standard voltage 

      FUEL INJECTION VOLUME REFERENCE

      Tester Display (Sensor) Injection Volumes Voltages
      O2S B1S2 -12.5% Less than 0.4 V
      +25% More than 0.5 V

    NG: REPLACE HEATED OXYGEN SENSOR 

    Fig 1: Fuel-Trim And Rear HO2S Voltage Cross-Reference Graph
    G04996382Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next step 

  3. CHECK WHETHER DTC OUTPUT RECURS (DTC P0606) 
    1. Connect the intelligent tester to the DLC3.
    2. Turn the ignition switch to the ON position and turn the tester on.
    3. Clear the DTCs (See DTC CHECK / CLEAR ).
    4. Turn the ignition switch off and turn the tester off.
    5. Disconnect the battery negative terminal and wait for 1 minute.
    6. Connect the battery negative terminal.
    7. Start the engine.
    8. Perform the drive pattern.
      1. Warm up the engine.
      2. Accelerate the vehicle to 50 mph (80 km/h) and stop the vehicle.
      3. Drive the vehicle at 35 to 50 mph (60 to 80 km/h) for 5 minutes or more.
    9. Turn the tester on.
      Fig 2: Monitor Drive Pattern Graph For P0606
      G04996383Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    10. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.
    11. Read the DTCs.

      Result 

      RESULT REFERENCE

      Display (DTC Output) Proceed to
      P0606 A
      No output B

    B: CHECK FOR INTERMITTENT PROBLEMS 

    A: REPLACE HV CONTROL ECU 

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