EGR System Monitor

OBD System Description - EGR System Monitor

System Description / Monitoring Procedure
To monitor electric controlled EGR system, the system measures pressure change caused by switching of the EGR valve during deceleration condition and also measures the voltage of EGR valve stepping motor electrical circuit continuously.

EGR System Monitoring System:

EGR System Monitoring System

DTC P0401 / P0402: Exhaust Gas Recirculation Flow Insufficient / Excessive Detected.

Wiring Diagram:

System / Wiring Diagram

DTC Detecting Condition:

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 be 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 temp.: Between 10 °C and 70 °C (14 °F and 158 °F)
- Altitude (barometric pressure): 2500 m, 8202 ft or less (560 mmHg, 75 kPa or more)

1. With ignition switch turned OFF, connect scan tool.
2. Turn ON ignition switch and clear DTC using scan tool.
3. Start engine and warm up to normal operating temperature.
4. Drive vehicle at 40 - 62 mph (60 100 km/h) (engine speed; 2000 3000 r/min.).
5. Keep the vehicle speed for 10 min. (Throttle valve opening is kept constant in this step.)
6. Stop vehicle.
7. Check if DTC / pending DTC exists using scan tool. If not, check if EGR system monitoring test has completed using scan tool. If not in both of the checks (i.e., no DTC / pending DTC and EGR system monitoring test not completed), check vehicle conditions (environmental) and repeat Steps 3 through 6.

Step 1 - 3:

Step 4 - 8:

Step 9 - 10:

DTC Troubleshooting

DTC P0403: Exhaust Gas Recirculation Control Circuit.

Wiring Diagram:

Wiring Diagram

DTC Detecting Condition:

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 be 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.

1. With ignition switch turned OFF, connect scan tool to DLC.
2. Turn ON ignition switch and clear DTC using scan tool.
3. Start engine and warm it up to normal operating temperature.
4. Drive vehicle in 2000 - 3500 rpm of engine speed for 10 minutes or more.
5. Keep the vehicle speed for 10 min. (Throttle valve opening is kept constant in this step.)
6. Stop vehicle and check DTC and pending DTC.