Air/Fuel Mixture: Testing and Inspection

1. Before inspection, set vehicles in the following condition:
^ Engine coolant temperature: 80 - 95° C (176 - 203° F)
^ Lights*, electric cooling fan and all accessories: OFF
^ Transaxle: Neutral (P range on vehicles with A/T)
2. After turning the ignition switch to OFF, connect the scan tool to the data link connector.
3. Start the engine and run it at 2,500 RPM for 2 minutes.
4. Set the CO, HC tester.
5. Check the CO content is 0.5% or less and the HC content is 100 PPM or less at idle.
6. If the idle speed is outside the standard value, check the following items:
^ Diagnostic output
^ Closed-loop control (When the closed-loop control is carried out normally, the output signal of the heated oxygen sensor repeats between 0 - 400 mV and 600 - 1,000 mV at idle.)
^ Fuel pressure
^ Injector
^ Ignition coil, spark plug cable, spark plug
^ EGR system and the EGR valve leak
^ Evaporative emission control system
^ Compression pressure

NOTE: Replace the three-way catalyst whenever the CO and HC contents do not remain inside the standard value. (even though the result of the inspection is normal on all items.)

* In vehicles for Canada, the headlight, tail light, etc. will stay on even when the lighting switch is turned OFF but this is no problem.