Air/Fuel Mixture: Testing and Inspection
INSPECT CO/HCHINT: This check is to determine whether or not the idle CO/HC complies with regulations.
(a) Start the engine.
(b) Run the engine at 2500 rpm for approximately 180 seconds.
(c) Insert the CO/HC meter testing probe at least 1.3 ft (40 cm) into the tailpipe during idling.
(d) Immediately check the CO/HC concentration during idling and/or at 2500 rpm.
HINT: When carrying out the 2 modes (idling and 2500 rpm) test, the measurement orders are prescribed by the applicable local regulations.
(e) If the CO/HC concentration does not comply with regulations, perform troubleshooting in the order given below.
(1) Check the A/F sensor operation and heated oxygen sensor operation.
(2) See the table for possible causes, and then inspect and correct the corresponding causes if necessary.
