Inspection Procedure

1. INSPECT 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 Techstream to the DLC3.
   2. Put the engine in inspection mode.
   3. Start the engine and turn the Techstream on.
   4. Warm up the engine at an engine speed of 2500 rpm for approximately 90 seconds.
   5. Enter the following menus: 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 heated oxygen sensors (O2S B1S2 and O2S B2S2) displayed on the Techstream.
   Fig 1: Fuel Trim And Rear HO2S Voltage Cross Reference

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   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 

   STANDARD VOLTAGE SPECIFICATIONS
   
   

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

   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 Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Clear the DTC.
5. Turn the power 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.
   Fig 2: Monitor Drive Pattern For P0606

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
10. Enter the following menus: Powertrain / Engine and ECT / Trouble Code.
11. Read the DTCs.

Result 

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

A: REPLACE ECM  (See REMOVAL )