On-Vehicle Inspection

2GR-FXE COOLING: EXHAUST HEAT RECIRCULATION SYSTEM: ON-VEHICLE INSPECTION

1. INSPECT CENTER EXHAUST PIPE ASSEMBLY

(a) Inspect the exhaust flow control valve operation.

(1) Using a screwdriver, move the exhaust flow control valve from the bottom of the vehicle. Check that the valve moves smoothly.





OK:

Valve moves smoothly.

(2) If the valve is stuck or does not move smoothly, replace the center exhaust pipe assembly Removal.

NOTICE:
Glass is used in the water temperature switch element. If the recirculator needs to be replaced, the water temperature switch should also be replaced because the element can be easily damaged in the recirculator replacement procedure.

(b) Inspect the exhaust pipe gas control actuator.

(1) Connect the Techstream to the DLC3.

(2) Turn the ignition switch to ON and turn the Techstream on.

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

(4) While checking the engine coolant temperature with the Techstream, check the operation of the exhaust pipe gas control actuator rod when the temperature rises.





Standard:





If the exhaust pipe gas control actuator rod does not extend smoothly, replace the exhaust pipe gas control actuator Removal.

HINT
* After the engine has warmed up (the thermostat temperature is approximately 80°C (176°F) or higher), the rod should be extended approximately 7.2 mm (0.284 in.) or more compared to when the engine is cold (the thermostat temperature is below 71°C (160°F)).
* The coolant 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 engine coolant temperature sensor, which is mounted on the engine, while the thermostat is positioned in the exhaust pipe gas control actuator.
* If it is difficult to check if the rod is operating, allow the engine to cool down until the coolant temperature matches the ambient temperature and then check the rod operation again.

(5) Check for any cracks or damage on the exhaust pipe gas control actuator rod.

OK:

No cracks or damage is found.

If any cracks or damage is found, replace the center exhaust pipe assembly Removal.

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

CAUTION:
Do not remove the radiator 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.

(a) Turn the ignition switch off. Check for engine coolant leaks from the center exhaust pipe assembly and the heater hose around the water temperature switch.

(b) Add engine coolant to the radiator and install a radiator cap tester.

(c) Pump the cap tester to 118 kPa (1.2 kgf/cm2, 17 psi), and then check that the pressure does not drop.

If the reading drops, check for leaks from the center exhaust pipe assembly and the heater hose around the water temperature switch.