Justin's Toyota Service

Emission Control System

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PARTS LOCATION

2006 ENGINE Emission Control - Sequoia

Fig. 1: Identifying Emission Control System Parts Location (1 Of 2) Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

AIR SWITCHING VALVE

AIR SWITCHING VALVE

SYSTEM DIAGRAM

2006 ENGINE Emission Control - Sequoia

Fig. 3: Evaporative Emission (EVAP) Control System Diagram Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

ON-VEHICLE INSPECTION

1. VISUALLY CHECK HOSES, CONNECTORS AND GASKETS

a. Check that there are no cracks, leaks or damage.

2006 ENGINE Emission Control - Sequoia

NOTE:

• Detachment or other problems with the engine oil dipstick, filler cap, PCV hose and other components may cause the engine to run improperly.

• Disconnection, looseness or cracks in the parts of the air induction system between the throttle body and cylinder head will allow air suction and cause an engine failure or engine failure malfunctions.

If the result is not as specified, replace parts as necessary.

Fig. 4: Checking Hoses, Connectors & Gaskets For Leaks Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Fig. 4: Checking Hoses, Connectors & Gaskets For Leaks Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

2. CHECK FUEL CUT OFF RPM

a. Start and warm up the engine.

b. Connect intelligent tester.

1. Connect a intelligent tester to the Controller Area Network Vehicle Interface Module (CAN VIM). Then connect the CAN VIM to the Date Link Connector 3 (DLC3).

2006 ENGINE Emission Control - Sequoia

Fig. 5: Connecting CAN VIM To Data Link Connector 3 (DLC3) Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

c. Inspect fuel cutoff rpm operation.

1. Increase the engine speed to at least 2,500 rpm.

2. Check for injector operating noise.

3. Check that when the throttle lever is released, injector operation noise stops momentarily and then resumes.

HINT:

• The vehicle should be stopped.

Fuel return speed: 1,400 rpm

2006 ENGINE Emission Control - Sequoia

Fig. 6: Checking That When Throttle Lever Is Released, Injector Operation Noise

Stops Momentarily & Then Resumes

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Fig. 6: Checking That When Throttle Lever Is Released, Injector Operation Noise

Stops Momentarily & Then Resumes

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

4. Disconnect the intelligent tester and CAN VIM from the DLC3.

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