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 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

Warm up the engine.

Fig 1: Fuel-Trim And Rear 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 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

INJECTION VOLUME 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 negative battery terminal.
5. Start the engine.
  
  Fig 2: Monitor Drive Pattern
  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 ECM )
  
  OK: CHECK FOR INTERMITTENT PROBLEMS (See CHECK FOR INTERMITTENT PROBLEMS )