Catalytic Converter: Testing and Inspection
THREE-WAY CATALYTIC CONVERTER (TWC) SYSTEMINSPECTION
1. CHECK TWC FOR DENTS OR DAMAGE
If any port of the heat insulator is damaged to the extent that it contacts the three-way catalytic converter, repair or replace it.
2. CHECK EXHAUST PIPE CONNECTIONS FOR LOOSENESS OR DAMAGE
3. CHECK EXHAUST PIPE CLAMPS FOR WEAKNESS, CRACKS OR DAMAGE
4. CHECK HEAT INSULATOR FOR DAMAGE
5. CHECK FOR ADEQUATE CLEARANCE BETWEEN EXHAUST SYSTEM AND HEAT INSULATOR ON THE BODY
6. INSPECT HC ABSORBER AND CATALYST SYSTEM
a. Warm up the engine.
b. TOYOTA hand-held tester:
Forced driving of the VSV for the HC absorber and catalyst system.
1. Connect a TOYOTA hand-held tester to the DLC3.
2. Start the engine.
3. Push the TOYOTA hand-held tester mode on the TOYOTA hand-held tester to operate the VSV for the HC absorber and catalyst system.
c. If you have no TOYOTA hand-held tester:
Forced driving of the VSV for the TOYOTA HC absorption catalyst system.
1. Disconnect the VSV connector for the TOYOTA HC absorption catalyst system.
2. Connect the positive (+) and negative (-) leads from the battery to the VSV.
3. Start the engine.
d. Check that the rod of the actuator is pulled and the valve is operating.
If not in operation, check the vacuum hose line or VSV, actuator.
7. INSPECT ACTUATOR
a. Remove the front exhaust pipe.
b. Remove the actuator from the front exhaust pipe.
c. Connect the MITYVAC (hand-held vacuum pump) to the actuator port.
d. Apply vacuum (more than 33.3 kPa, 250 mmHg, 9.83 in.Hg), make sure that the rod is retracted.
If the not, replace the actuator.
e. Disconnect the MITYVAC (hand-held vacuum pump) from the actuator port.
8. INSPECT VALVE OPERATION
a. Turn the valve stay by hand and ensure that it can turn.
If the not, replace the front exhaust pipe.
b. Install the actuator to the front exhaust pipe.
c. Install the front exhaust pipe.