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.
- Selector lever is in "D" range (A/T).
- A/C switch is off.
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 vehicle to 35-40 MPH.
- Keep speed constant at 35-40 MPH for 20 seconds or more. Use 4th gear on M/T.
- 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.
- Accelerate to 35-40 MPH, then hold speed constant for 20 seconds or more. Repeat steps 4 and 5 seven more times.
- Return vehicle to shop and turn ignition off. Recheck for DTC(s). If any DTC(s) is set, diagnose affected DTC(s). See DIAGNOSTIC TROUBLE CODE DEFINITIONS .