Inspection Procedure

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 

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 sensor 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.
     Fig 1: Identifying Fuel-Trim & Rear HO2S Voltage Cross-Reference Graph

     Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard voltage 

   STANDARD VOLTAGE
   
   

   Tester Display (Sensor)	Injection Volume	Voltage
   O2S B1S2 or O2S B2S2	-12.5%	Less than 0.2 V
   	+25%	More than 0.8 V

NG: REPLACE HEATED OXYGEN SENSOR 

OK: Go to next step 

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.
   Fig 2: Identifying Monitor Drive Pattern For P0606

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   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.

    Result 

    RESULT REFERENCE
    
    

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

B: CHECK FOR INTERMITTENT PROBLEMS 

A: REPLACE HYBRID VEHICLE CONTROL ECU