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 Techstream 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: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F Sensor.
5. 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).
6. Monitor the voltage outputs of the heated oxygen sensors (O2S B1S2 and O2S B2S2) 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.

   Standard voltage 

   VOLTAGE TABLE
   
   

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

   Fig 1: Identifying Fuel-Trim & HO2S Voltage Graph

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE HEATED OXYGEN SENSOR  (See REMOVAL )

OK: Go to next step 

1. Connect Techstream to the DLC3.
2. Turn the ignition switch on (IG).
3. Turn the tester on.
4. Clear the DTC.
5. Turn the ignition 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 6 minutes or more.
10. Select the following menu items: Powertrain / Engine and ECT / Trouble Code.
11. Read the DTCs.

    Result 

    RESULT TABLE
    
    

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

    Fig 2: Identifying Engine Coolant Temperature Driving Pattern

    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

B: CHECK FOR INTERMITTENT PROBLEMS  (See CHECK FOR INTERMITTENT PROBLEMS )

A: REPLACE ECM  (See REMOVAL )