Inspection Procedure

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

   OK: No leak from the HO2S. 

NG: REPAIR LEAK 

OK: Go to next step 

Fig 1: Identifying Fuel-Trim And Rear HO2S Voltage Cross-Reference Pattern

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

   Standard 

   A/F SENSOR INJECTION VOLUME
   
   

   A/F CONTROL (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 REMOVAL )

OK: Go to next step 

1. Clear DTC (see DTC CHECK / CLEAR ).
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 Monitor Drive Pattern (P0607)

   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 by 35 to 50 mph (60 to 80 km/h) for 5 minutes or more.
7. Check DTC.

   OK: P0607 is not present. 

NG: REPLACE ECM  (see REMOVAL )

OK:  CHECK FOR INTERMITTENT PROBLEMS