INSPECTION PROCEDURE 1. INSPECT THROTTLE BODY ASSEMBLY (a) Check the throttle valve. (1) Check that the throttle valve opens and closes smoothly. (2) Check that there is no sludge accumulating around the throttle body.
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Toyota Tundra Service Manual > Emission Control System: On-vehicle Inspection
ON-VEHICLE INSPECTION PROCEDURE 1. INSPECT FUEL CUT-OFF OPERATION (a) Start and warm up the engine. (b) Open the throttle valve and keep the engine speed at 3000 rpm. (c) Use a sound scope to check for injector operating noise. (d) Check that when the accelerator pedal is released, injector operatio ...