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