Air/Fuel Mixture: Testing and Inspection

INSPECT CO/HC
a) Start the engine.
b) Run the engine at 2,500 rpm for approximately 180 seconds.
c) Insert the CO/HC meter testing probe at least 40 cm (1.3 ft.) into tailpipe during idling.
d) Immediately check the CO/HC concentration while idling and/or at 2,500 rpm.

HINT:
^ Complete the measurement within 3 minutes.
^ When doing the 2 modes (idle and 2,500 rpm) test, the measurement orders are prescribed by the applicable local regulations.





e) If the CO/HC concentration does not comply with regulations, troubleshoot in the order given below.
1) Check the heated oxygen sensor operation.