Air/Fuel Mixture: Testing and Inspection

INSPECTION

HINT: This check is used only to determine whether or not the idle CO/HC complies with regulations.

1. INSTALL CONDITIONS
a. Air cleaner installed
b. Air pipes and hoses of air induction system connected
c. All accessories switched OFF
d. All vacuum lines properly connected
e. EFI system wiring connectors fully plugged
f. Ignition timing check correctly
g. Transmission in parking range
h. Tachometer and CO/HC meter calibrated by hand
2. ACTIVATE INSPECTION MODE AND WARM UP ENGINE
3. RACE ENGINE AT 2,250 RPM FOR APPROXIMATELY 180 SECONDS

HINT: At the accelerator opening angle of 60% or more, the engine speed is controlled at 2,250 rpm.





4. INSERT CO/HC METER TESTING PROBE AT LEAST 40 cm (1.3 ft.) INTO TAILPIPE DURING IDLING
5. IMMEDIATELY CHECK CO/HC CONCENTRATION AT IDLE AND/OR 2,250 RPM
Complete the measuring with 3 minutes.

HINT: When doing the 2 mode (idle and 2,250 rpm) test, this measurement order prescribed by the applicable local regulations.





6. STOP ENGINE
If the CO/HC concentration does not comply with regulations, troubleshoot in the order given.
^ Check heated oxygen sensor operation.
^ See the table for possible causes, and then inspect and correct the applicable causes if necessary.