P0400

SYSTEM/WIRING DIAGRAM

SYSTEM DESCRIPTION
EGR system consists of EGR valve and its passage. ECM (PCM) judges EGR valve opening based on following items. (engine speed, engine load, engine coolant temperature, intake air temperature and vehicle speed).
If EGR system is in good condition, intake manifold absolute pressure is varied within specified value as soon as ECM (PCM) opens EGR valve.




DTC DETECTING CONDITION AND TROUBLE AREA

DTC CONFIRMATION PROCEDURE

NOTE: Check to make sure that following conditions are satisfied when using this DTC CONFIRMATION PROCEDURE.

WARNING:
- When performing a road test, select a place where there is no traffic or possibility of a traffic accident and very careful during to avoid occurrence of an accident.
- Road test, should be carried out with 2 person, a driver and tester, on a level road.

- Intake air temperature: between -14°C and 70°C (6.8°F and 158°F)
- Atmospheric pressure: higher than 560 mm.Hg (Altitude: lower than 2790 m (9150 ft))
- Following DTC is not detected: P1408

1. With ignition switch OFF, connect scan tool.
2. Turn ON ignition switch and clear DTC by using scan tool if any.
3. Start engine and warm up to normal operating temperature.
4. Increase vehicle speed to 50 - 65 kmh (30 -40 mph) (engine speed; 2000- 3000 rpm.).
5. Keep above vehicle speed for 3 min. (Throttle valve operating is kept constant in this step.)
6. Stop vehicle and check DTC and pending DTC by using scan tool.




DTC TROUBLESHOOTING (DTC PO400)