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 while idling.
(d) Check the CO/HC concentration during idling and when running at 2,500 rpm.

HINT: When doing the 2 mode (with the engine idling/running at 2,500 rpm) test, the measuring procedures are determined by 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 the applicable parts and repair them if necessary.