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Home >> Lexus >> 2008 >> RX 400h AWD >> 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 Techstream to the DLC3.
    2. Put the engine in inspection mode.
    3. Start the engine and turn the tester on.
    4. Warm up the engine at an engine speed of 2500 rpm for approximately 90 seconds.
    5. Select the following menu items: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F Sensor.
    6. Perform the Control the Injection Volume for A/F Sensor operation with the engine in an idling condition (press the RIGHT or LEFT button to change the fuel injection volume).
    7. Monitor the voltage outputs of the HO2 sensors (O2S B1S2) displayed on the tester.

      HINT:

      • The Control the Injection Volume for A/F Sensor 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.
        Fig 1: Fuel-Trim And Rear HO2S Voltage Cross-Reference Chart
        G04996382Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard voltage 

      TERMINALS VOLTAGE 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 

    OK: Go to Next Step 

  3. CHECK WHETHER DTC OUTPUT RECURS (DTC P0606) 
    1. Connect Techstream 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.
    10. Select the following menu items: Powertrain / Engine and ECT / Trouble Code.
    11. Read the DTCs.
      Fig 2: Vehicle Speed Driving Pattern
      G04996383Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Result 

      RESULT CHART

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

    B: CHECK FOR INTERMITTENT PROBLEMS 

    A: REPLACE HV CONTROL ECU 

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