Air/Fuel Mixture: Testing and Inspection
9. INSPECT CO/HCa. Set the vehicle to inspection mode.
b. Race the engine at 2,500 rpm for approximately 180 seconds.
c. Insert at least 40 cm (1.3 ft) of the CO/HC meter testing probe into the tailpipe while idling.
d. Immediately check the CO/HC concentration at idle and 2,500 rpm.
HINT:
^ Complete the measuring within 3 minutes.
^ When doing the 2 mode (at idle and 2,500 rpm) test, the procedure may vary according to local regulations.
e. If the CO/HC concentration does not comply with regulations, perform troubleshooting in the order given below.
1. Check the heated oxygen sensor operation.
2. See the table below for possible causes, then inspect the applicable causes and correct them if necessary.