Sienna AWD V6-3.3L (3MZ-FE) (2004)
Air/Fuel Mixture: Testing and Inspection
10. INSPECT CO/HC
a. Start the engine.
b. Race the engine at 2,500 rpm for approximately 180 seconds.
c. Insert CO/HC meter testing probe at least 40 cm (1.3 ft.) into tailpipe during idling.
d. Immediately check CO/HC concentration at idle and/or 2,500 rpm.
HINT:
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Complete the measuring within 3 minutes.
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When doing the 2 mode (idle and 2,500 rpm) test, the procedure may vary according to local regulations.
e. If the CO/HC concentration does not comply with regulations, troubleshoot in the order given.
1. Check heated oxygen sensor operation.
2. See the table for possible causes, and then inspect and correct the applicable causes if necessary.