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EXHAUST HEAT RECIRCULATION SYSTEM > ON-VEHICLE INSPECTION

for Preparation Click here



1. INSPECT FRONT EXHAUST PIPE ASSEMBLY


  1. Inspect exhaust flow control valve operation.



      A216067E01

    1. Using a screwdriver, move the exhaust flow control valve from the bottom of the vehicle. Check that the valve moves smoothly.
      Text in Illustration 
      *1
      		Protective Tape

      OK:
      Valve moves smoothly.

    2. If the valve is stuck or does not move smoothly, replace the front exhaust pipe assembly (Click here).



  1. Inspect the exhaust pipe gas control actuator.

    1. Connect the the intelligent tester to the DLC3.

    2. Turn the power switch on (IG) and turn the tester on.

    3. Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp.



      4. A216073

    4. While checking the engine coolant temperature with the the intelligent tester check the operation of the exhaust pipe gas control actuator rod when the temperature rises.

      Standard:
      Condition
      		Rod Operation
      Cold (below approx. 71°C (160°F)) → Warmed up (approx. 80°C (176°F) or more)
      		Rod gradually extends as the temperature rises.

      HINT:
      1. After the engine has warmed up (thermostat temperature is approximately 80°C (176°F) or more), the rod should be extended approximately 7.2 mm (0.284 in.) or more compared to when the engine is cold (thermostat temperature is below 71°C (160°F)).
      1. The water temperature shown in the Data List may slightly deviate from the thermostat temperature. This is because the Data List value indicates the temperature detected by the water temperature sensor, which is mounted on the engine, while the thermostat is positioned in the exhaust pipe gas control actuator.
      1. If it is difficult to check while the rod is operating, allow the engine to cool down until the water temperature matches the ambient temperature and then check the rod operation again.

    5. If the exhaust pipe gas control actuator rod does not move smoothly, replace the exhaust pipe gas control actuator (Click here).

    6. Check for any cracks or damage on the exhaust pipe gas control actuator rod.

      OK:
      No cracks or damage is found.

    7. If any cracks or damage is found, replace the front exhaust pipe assembly (Click here).



2. INSPECT FOR ENGINE COOLANT LEAK FROM FRONT EXHAUST PIPE ASSEMBLY

CAUTION:
Do not remove the reservoir tank cap while the engine and radiator are still hot. Pressurized, hot engine coolant and steam may be released and cause serious burns.

NOTICE:
Be sure to turn the A/C switch off before starting the following inspection.

  1. Turn the power switch off. Check for engine coolant leaks from the front exhaust pipe assembly and the heater hose around the engine coolant temperature sensor.



    A200771

  1. Add engine coolant to the radiator and install the radiator cap tester.

  1. Pump it to 108 kPa (1.1 kgf/cm2, 16 psi), then check that the pressure does not drop.
    If the reading drops, check for leaks from the front exhaust pipe assembly and the heater hose around the engine coolant temperature sensor.