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Home >> Lexus >> 2007 >> ES 350 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTC P0606 - P2A03, DTC U0101 >> DTC P0606: ECM/PCM Processor >> Inspection Procedure
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Inspection Procedure

  1. CHECK FOR EXHAUST GAS LEAK 
    1. Allow the engine to idle.
    2. Check for exhaust gas leak 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 2,500 rpm for approximately 90 seconds.
    4. Enter the following menus: DIAGNOSIS / ENHANCED 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 or O2S B2S2) 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 

      VOLTAGE SPECIFICATION TABLE

      Tester Display (Sensor) Injection Volume Voltage
      O2S B1S2 or O2S B2S2 -12.5% Less than 0.2 V
      +25% More than 0.8 V
      Fig 1: Identifying Fuel-Trim & Rear HO2S Voltage Cross-Reference Diagram
      G05007821Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE HEATED OXYGEN SENSOR  (See REMOVAL )

    OK: Go to Next Step 

  3. CHECK WHETHER DTC OUTPUT RECURS (IN ADDITION TO DTC P0606) 
    1. Connect the intelligent tester to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the tester on.
    4. Clear the DTC.
    5. Turn the engine switch off.
    6. Disconnect the battery negative terminal and wait for 1 minute.
    7. Connect the battery negative terminal.
    8. Start the engine.
    9. 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.
    10. Enter the following menus: DIAGNOSIS / ENHANCED II / DTC INFO / CURRENT CODES.
    11. Read the DTCs.
      Fig 2: Identifying Monitor Drive Pattern For P0606
      G05007822Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Result 

      RESULT REFERENCE

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

    B: CHECK FOR INTERMITTENT PROBLEMS 

    A: REPLACE ECM (See  REMOVAL  ) 

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