Highlander 4WD V6-3.0L (1MZ-FE) (2003)
Air/Fuel Mixture: Testing and Inspection
INSPECT CO/HC
a. Start the engine.
b. Race engine at 2,500 rpm. for approx. 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:
^
Complete the measuring within 3 minutes.
^
When doing the 2 mode (idle and 2,500 rpm) test, these measuring orders are prescribed by the applicable 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 above for possible causes, and then inspect and correct the applicable causes if necessary.