Tacoma PreRunner Dbl Cab 2WD V6-3.4L (5VZ-FE) (2001)
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 clip installed.
b. All Pipes and hoses of air induction system connected.
d. All accessories switched OFF.
e. All vacuum lines properly connected.
f.
SF system wiring connectors fully plugged.
g. Ignition timing checked 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 APPROXIMATELY 180 SECONDS
4. INSERT CO/HC METER TESTING PROBE AT LEAST 40 or (1.3 ft) INTO TAILPIPE DURING IDLING
5. IMMEDIATELY CHECK CO/HC CONCENTRATION AT IDLE AND/OR 2,500 RPM
Complete the measuring within 3 minutes.
HINT: When doing the 2 mode (2,500 rpm and idle) test, follow the measurement order prescribed by the applicable local regulations.
6. TROUBLESHOOTING
If the CO/HC concentration does not comply with regulations, troubleshoot in the order given.
1. Check the A/F sensor or heated oxygen sensor operation (Refer to Powertrain Management).