Tacoma 4WD L4-2.7L (3RZ-FE) (2004)
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. INITIAL CONDITIONS
a. Engine at normal operating temperature
b. Air cleaner installed
c. Ail pipes and hoses of air induction system connected
d. All accessories switched OFF
e. All vacuum lines properly connected
HINT: All vacuum hoses for EGR systems, etc. should be properly connected.
f.
SFI system wiring connectors fully plugged
g. Ignition timing check correctly
h. Transmission in neutral position
i.
Tachometer and CO/HC meter calibrated by hand
2. START ENGINE
3. RACE ENGINE AT 2,500 RPM FOR APPROX. 180 SECONDS
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 2,500 RPM
HINT: When doing the 2 mode (idle and 2,500 rpm) test, these measurement order prescribed by the applicable local regulations.
6. TROUBLESHOOTING
If the CO/HC concentration does not comply with regulations, troubleshoot according in the order given.
1. Check heated oxygen sensor operation.