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Engine Co/HC Emission Testing: Co/HC: Inspection

NOTE: This check is used only to determine whether or not the idle CO/HC complies with specifications.
  1. Initial conditions. 
    1. Engine at normal operating temperature
    2. Air cleaner installed
    3. Air pipes and hoses of air induction system connected
    4. All accessories switched OFF
    5. All vacuum lines properly connected
    6. SFI system wiring connectors fully plugged
    7. Ignition timing check correctly
    8. Transmission in neutral position
    9. 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. 

    Complete the measuring within 3 minutes.

    NOTE: 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.

    1. Check the oxygen sensor operation (See DTC P0141: HEATED OXYGEN SENSOR HEATER CIRCUIT MALFUNCTION , and DTC P0161: HEATED OXYGEN SENSOR HEATER CIRCUIT MALFUNCTION ).
    2. See the table next page for possible causes, and then inspect and correct the applicable causes if necessary.

    Fig 1: Displaying Posible Causes
    G01083595Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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