Tailpipe Emissions Test

1.Connect a tachometer.

2.Start the engine. Hold the engine at 3,000 rpm (min-1) with no load (in Park or neutral) until the radiator fan comes on, then let it idle.

3.Check the idle speed.

4.Warm up and calibrate the CO meter according to the meter manufacturer¢s instructions.

5.Check idle CO with the headlights, heater blower, rear window defogger, cooling fan, and air conditioner off.

Specified CO%:
For cars with TWC model: 0.1 % maximum
For cars without TWC model: 1.0 ± 1.0 %

  • If unable to obtain this reading:
    Without TWC model, adjust by turning the adjusting screw (A) of the IMA.
    With TWC model, see DTC troubleshooting index.

  • If unable to obtain a CO reading of specified % by this procedure, check the tune-up condition.