Tacoma 2WD L4-2.4L (2RZ-FE) (1996)
Air/Fuel Mixture: Component Tests and General Diagnostics
HINT: This check is used only to determine whether or not the idle CO/HC complies with regulations.
1. INITIAL CONDITIONS:
-
Engine at normal operating temperature.
-
Air cleaner installed.
-
All pipes and hoses of air induction system connected.
-
All accessories switched OFF.
-
All vacuum lines properly connected.
HINT: All vacuum hoses for EGR systems, etc. should be properly connected.
-
MFI system wiring connectors fully plugged in.
-
Ignition timing check correctly.
-
Transmission in neutral position.
-
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/HO METER TESTING PROBE AT LEAST 40 cm (1.3 ft) INTO TAILPIPE DURING IDLING.
5. IMMEDIATELY CHECK CO/HO 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.
Troubleshooting
If the CO/HC concentration does not comply with regulations, troubleshoot according to the table above.
-
Check heated oxygen sensor operation.
-
Check and correct the cause if necessary.