Component Tests and General Diagnostics

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.

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).

6. If the idle speed is outside the standard value, check the following items:
- Diagnostic output
- Closed-loop control

NOTE: 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 cables and spark plugs
- EGR system and the EGR valve leak
- Evaporative emission control system
- Compression pressure