EGR Monitor
This monitor applies to DTC P0401. 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.
- On A/T, selector lever is in "D" range.
- 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:
- Remove all test equipment from vehicle and install all components and connectors that were removed or disconnected during testing.
- After engine is completely warmed up, turn ignition off.
- Start engine and quickly accelerate to 35-40 MPH.
- Keep speed constant at 35-40 MPH for 20 seconds or more. On M/T, use 4th gear.
- Decelerate by closing throttle fully and allowing engine speed to drop from 2000-3000 RPM to about 900 RPM. DO NOT apply brakes. DO NOT turn steering wheel or operate light switch during this time. On M/T, keep clutch engaged during deceleration.
- Accelerate to 35-40 MPH, then hold speed constant for 20 seconds or more. Repeat steps 5 and 6 seven more times.
- Return vehicle to shop and turn ignition off.