Air/Fuel Mixture: Testing and Inspection
INSPECT CO/HCa. 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. Check CO/HC concentration at idle and/or 2,500 rpm.
HINT: When doing the 2 mode (with the engine is in the idle and 2,500 rpm) test, these measuring order are prescribed by the applicable local regulations. If the CO/HC concentration does not comply with regulations, troubleshoot in this order.
1 Check heated oxygen sensor operation.
2 See the table for possible causes, and then inspect and repair the applicable causes if necessary.
