Inspection Procedure

HINT:

Read freeze frame data using the Techstream. Freeze frame data record the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data, from the time the malfunction occurred.

CHECK FOR EXHAUST GAS LEAK
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.

CHECK HEATED OXYGEN SENSOR

Warm up the engine.

Fig 1: Fuel Trim And HO2S Voltage Graph
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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 B1 S2 (O2S B2 S2) values when the Control the Injection Volume for A/F Sensor is -12.5% (Lean fuel-trim).

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

TESTER CONNECTION SPECIFIED CONDITION

Control the Injection Volume for A/F Sensor	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.

CHECK DTC
1. Clear DTC.
2. Turn the ignition 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: Driving Pattern Of Engine Coolant Temperature
  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