LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Toyota >> 2007 >> Prius Base >> Repair and Diagnosis >> Engine Performance >> Engine Control System >> SFI System >> DTC P0606 ECM / PCM Processor >> Inspection Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

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 leakage 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 

      VOLTAGE SPECIFICATION

      Tester Display (Sensor) Injection Volumes Voltages
      O2S B1S2 -12.5% Less than 0.4 V
      +25% More than 0.5 V
      Fig 1: Fuel-Trim And Rear Ho2S Voltage Cross-Reference Graph
      G04996382Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE HEATED OXYGEN SENSOR 

    OK: Go to Next Step 

  3. CHECK WHETHER DTC OUTPUT RECURS (DTC P0606) 
    1. Connect the intelligent tester to the DLC3.
    2. Turn the power switch ON (IG) and turn the tester on.
    3. Clear the DTC (See DTC CHECK / CLEAR  ).
    4. Turn the power 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: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.
      Fig 2: Checking Whether DTC Output Recurs
      G05188856Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    11. Read the DTCs.

      Result 

      DTC CHART

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

    B: CHECK FOR INTERMITTENT PROBLEMS 

    A: REPLACE ECM 

scientia non olet · About LEMON Manuals