P0400

System/Wiring Diagram:

Terminal Arrangement Of ECM(PCM) Coupler(Viewed From Harness Side):

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

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

NOTE: Check to make sure that the following conditions are satisfied when using this "DTC CONFIRMATION PROCEDURE".
- Intake air temperature: between -14 °C and 70 °C (6.8 °F and 158 °F)
- Atmospheric pressure: higher than 560 mmHg (Altitude: lower than 2790 m (9150 ft))
- The 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 km/h (30 - 40 mph) (engine speed 2000 - 3000 r/min.).
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.

Step 1 - 4:

Step 5 - 6:

Fig. For Step 4:

Fig. For Step 5:

DTC TROUBLESHOOTING