Inspection Procedure

WARNING: This page is about a different car, the 2009 Toyota Tacoma. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR EXHAUST GAS LEAK
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

CHECK HEATED OXYGEN SENSOR

Fig 1: Fuel-Trim And Rear HO2S Voltage Pattern

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Warm up the engine.
Allow the engine to idle.
Enter the following menus: Powertrain/Engine and ECT/Active Test/Control the Injection Volume for A/F Sensor.
Check the O2S B1S2 (O2S B2S2) values when the Control the Injection Volume for A/F Sensor is -12.5% (Lean fuel-trim).

Check the O2S B1S2 (O2S B2S2) values when the Control the Injection Volume for A/F Sensor is 25% (Rich fuel-trim).

Standard

WAVEFORM 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 (See HEATED OXYGEN SENSOR )

OK: Go to next step

CHECK DTC
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: Engine Coolant Temperature 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 (See REMOVAL )
  
  OK: CHECK FOR INTERMITTENT PROBLEMS (See CHECK FOR INTERMITTENT PROBLEMS )