EGR Monitor

This monitor applies to DTC P0400. Following conditions must be met during the test:

• Engine coolant temperature must be 176°F (80°C) or more.
• Atmospheric temperature is 41°F (5°C) or more.
• If automatic transmission, selector lever is in "D" range.
• If applicable, overdrive switch is in ON position.
• If applicable, pattern select switch is in OFF position.
• A/C switch is in OFF position.

Monitor takes about 10 minutes to complete. To run monitor, use illustration. See Fig 1 . Perform steps as follows:

1. Remove all test equipment from vehicle and install all components and connectors that were removed or disconnected during testing.
2. Start engine.
3. Accelerate to 35-40 MPH.
4. Keep speed constant for 20 seconds or more (M/T: 4th gear).
5. Fully close throttle from engine speed of 2000-3000 RPM (M/T: keep clutch engaged) and decelerate to about 900 RPM without applying brakes. DO NOT turn steering wheel or operate light switch during this time.
6. Accelerate to 35-40 MPH, then hold speed constant for 20 seconds or more (M/T: 4th gear). Repeat steps 4)  and 5)  seven more times.
7. Return vehicle to shop and turn ignition off.
8. Confirm DTC is not output. If DTC is output, go to appropriate DTC test in appropriate SELF-DIAGNOSTICS article.

Fig 1: Running EGR Monitor

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.