Air/Fuel Mixture: Testing and Inspection
CO/HCINSPECT CO/HC
HINT: This check is used only to determine whether or not the idle CO/HC complies with regulations.
(a) Start the engine.
(b) Sustain the engine speed 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 CO/HC concentration at idle and/or 2,500 rpm.
HINT: When performing the 2 mode (2,500 rpm and idle) test, follow the measurement order prescribed by the applicable local regulations.
If the CO/HC concentration does not comply with the regulations, troubleshoot in the order given below.
(1) Check the heated oxygen sensor operation.
(2) See the table below for possible causes, then inspect and correct the applicable causes if necessary.
