Inspection Procedure

1. Allow the engine to idle.
2. Check for an exhaust gas leak around the HO2S.

   OK: 

   No leak from the HO2S. 

NG : REPAIR LEAK 

OK : Go to next step 

Fig 1: Fuel Trim And Rear HO2S Voltage Graph

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1. Warm up the engine.
2. Allow the engine to idle.
3. Select the following menu items: Powertrain/Engine and ECT/Active Test/Control the Injection Volume for A/F Sensor.
4. Check the O2S B1 S2 (O2S B2 S2) values when the Control the Injection Volume for A/F Sensor is -12.5% (Lean fuel-trim).
5. Check the O2S B1 S2 (O2S B2 S2) values when the Control the Injection Volume for A/F Sensor is 25% (Rich fuel-trim).

   Standard 

   FUEL INJECTION VOLUME REFERENCE
   
   

   A/F CONTROL	O2S B1 S2 (O2S B2 S2)
   -12.5%	Less than 0.2 V
   25%	More than 0.8 V

NG : REPLACE HEATED OXYGEN SENSOR 

OK : Go to next step 

1. Clear DTC (See DTC CHECK/CLEAR ).
2. Turn the engine switch off.
3. Disconnect the battery negative terminal and wait for 1 minute.
4. Connect the battery negative terminal.
5. Start the engine.
   Fig 2: Engine Coolant Temperature Graph

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
6. Perform the drive pattern.
   1. Warm up the engine.
   2. Accelerate the vehicle until 50 mph (80 km/h) and stop the vehicle.
   3. Drive the vehicle between 35 and 50 mph (60 to 80 km/h) for 5 minutes or more.
7. Check DTC.

   OK: 

   P0606 is not present. 

NG : REPLACE ECM 

OK : CHECK FOR INTERMITTENT PROBLEMS