Engine Co/HC Emission Testing: Inspection

HINT:

This check is used only to determine whether or not the idle CO/HC complies with regulations.

1. INITIAL CONDITIONS 
   1. The engine is at normal operating temperature.
   2. Air cleaner is installed.
   3. All pipes and hoses of the air induction system are connected.
   4. All accessories are switched OFF.
   5. All vacuum lines are properly connected.

      HINT:

      All vacuum hoses should be properly connected.

   6. SFI system wiring connectors are fully plugged.
   7. Ignition timing is set correctly.
   8. Transmission is in neutral range.
   9. Tachometer and CO/HC meter are calibrated by hand.
2. START ENGINE 
3. RACE ENGINE AT 2,500 RPM FOR APPROX. 180 SECONDS 
   Fig 1: Checking CO/HC Concentration Idle And/Or 2,500 RPM

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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 performing the 2 mode (2,500 RPM and idle) test, follow the measurement order prescribed by the applicable local regulations.

6. TROUBLESHOOTING 

   HINT:

   If the CO/HC concentration does not comply with the regulations, perform troubleshooting in the order given in illustration. See Fig 2 for possible causes, and then inspect and correct the applicable causes if necessary.

   Fig 2: CO/HC Problem Table

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002