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Inspection Procedure

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: Ho2S And Fuel-Trim Voltage Graph

G04967990

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Warm up the engine.
Allow the engine to idle.
Select the tester menus: ENHANCED OBD-II, ACTIVE TEST AND A/F CONTROL.
Check the O2S B1S2 (O2S B2S2) values when the A/F CONTROL is -12.5% (Lean fuel-trim).
Check the O2S B1S2 (O2S B2S2) values when the A/F CONTROL is 25% (Rich fuel-trim).

Standard

A/F CONTROL CHART

A/F CONTROL	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

CHECK DTC
1. Clear DTC.
2. Turn the engine 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 Vehicle Driving 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 INTERMITTENT PROBLEMS

OK: Go to next step