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

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Warm up the engine.
2. Allow the engine to idle.
3. Select the tester menus: Powertrain/Engine and ECT/Active Test/Control the Injection Volume for A/F Sensor
4. Check the O2S B1S2 (O2S B2S2) values when the Control the Injection Volume for A/F Sensor is -12.5% (Lean fuel-trim).
5. Check the O2S B1S2 (O2S B2S2) values when the Control the Injection Volume for A/F Sensor is 25% (Rich fuel-trim).

   Standard 

   STANDARD REFERENCE
   
   

   Control the Injection Volume for A/F Sensor	O2S B1S2 (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. Clear DTC.
2. Turn the ignition switch OFF.
3. Disconnect the cable from the negative battery terminal and wait for 1 minute.
4. Connect the cable to the negative battery terminal.
5. Start the engine.
   Fig 2: Identifying Drive Pattern

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

   OK: P0606 is not present. 

NG: REPLACE ECM 

OK: CHECK FOR INTERMITTENT PROBLEMS