Tundra 4WD V8-5.7L (3UR-FE) (2007)
Air/Fuel Mixture: Testing and Inspection
INSPECT CO/HC
HINT: This check is used only to determine whether or not the idle CO/ HC complies with regulations.
(a)
Start the engine.
(b) Keep the engine speed at 2500 rpm for approximately 180 seconds.
(c)
Insert the CO/HC meter testing probe at least 40 cm (1.31 ft.) into the tailpipe during idling.
(d) Immediately check CO/HC concentration at idle and/or 2500 rpm.
HINT: When performing the 2 mode (2500 rpm and idle) test, follow the measurement order prescribed by the applicable local regulations.
(e)
If the CO/HC concentration does not comply with the regulations, troubleshoot in the order given below.
(1) Check the A/F sensor and heated oxygen sensor operation.
(2) See the table for possible causes, and then inspect and correct the applicable causes if necessary.