Section 455 (Engine Mechanical): Co/HC: Inspection
WARNING: This page is about a different car, the 2004 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.
HINT:
This check is used only to determine whether or not the idle CO/HC complies with specifications.
- INITIAL CONDITIONS
- Engine at normal operating temperature
- Air cleaner installed
- Air pipes and hoses of air induction system connected
- All accessories switched OFF
- All vacuum lines properly connected
- SFI system wiring connectors fully plugged
- Ignition timing check correctly
- Transmission in neutral position
- Tachometer and CO/HC meter calibrated by hand
- START ENGINE
- RACE ENGINE AT 2,500 RPM FOR APPROX. 180 SECONDS
- INSERT CO/HC METER TESTING PROBE AT LEAST 40 cm (1.3 ft) INTO TAILPIPE DURING IDLING
- IMMEDIATELY CHECK CO/HC CONCENTRATION AT IDLE AND/OR 2,500 RPM
Complete the measuring within 3 minutes.
HINT:
When performing the 2 mode (2,500 rpm and idle) test, follow the measurement order prescribed by the applicable local regulations.
If the CO/HC concentration does not conform to specifications, perform troubleshooting in the order given below.
- Check the A/F sensor operation (see DTC P2195: OXYGEN (A/F) SENSOR SIGNAL STUCK LEAN (BANK 1 SENSOR 1), DTC P2196: OXYGEN (A/F) SENSOR SIGNAL STUCK RICH (BANK 1 SENSOR 1) ).
- See Fig 2 for possible causes, and then inspect and correct the applicable causes if necessary.