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 the tailpipe during idling.
(d) Immediately check the CO/HC concentration during idling and/or at 2,500 rpm.

HINT:
^ Complete the measurement within 3 minutes.
^ When carrying out the 2 modes (idling 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.
(1) Check the heated oxygen sensor operation.