EGR Monitor
This monitor applies to DTC P0401. Following conditions must be met during test:
- Engine coolant temperature must be 176-203°F (80-95°C).
- Ambient temperature is 41°F (5°C) or more.
- Selector lever is in "D" range.
- A/C switch is in OFF position.
This one trip monitor, takes about 10 minutes to complete. Remove all test equipment from vehicle and install all components and connectors that were removed or disconnected during testing. To run monitor, use illustration and perform following steps. See Fig 1. Step numbers in procedure will correspond to step numbers in illustration.
- After engine coolant temperature reaches 176-203°F (80-95°C), turn off ignition.
- Start engine and quickly accelerate vehicle to 35-40 MPH.
- When engine speed is 2000-3000 RPM, fully close throttle and allow vehicle to decelerate to about 900 RPM without applying brakes. Do not turn steering wheel or operate light switch during this time.
- Accelerate to 35-40 MPH, then hold speed constant for 20 seconds or more. Then repeat steps 3 and 4) fully 7 more times.
- Stop vehicle and turn ignition off.