Air/Fuel Mixture: Testing and Inspection

INSPECT CO/HC
a. Start engine.
b. Race 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: 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 in image.
Check heated oxygen sensor operation.