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.
- A/C switch is in OFF position.
- Selector lever is in "D" range.
NOTE:
Remove all test equipment from vehicle and install all components and connectors that were removed or disconnected during testing.
Monitor takes about 10 minutes to complete. This cycle must be completed 2 times. Run monitor as shown. See Fig 1 . Perform steps as follows:
- Start engine.
- Accelerate to 35-40 MPH (56-64 km/h).
- Travel for 20 seconds or more while keeping the vehicle speed at 35-40 MPH (56-64 km/h).
- Fully close the throttle from an engine speed of 2000-3000 RPM, and while keeping the clutch engaged, (M/T), decelerate to about 900 RPM without applying the brakes. DO NOT turn steering wheel or operate light switch during this time (during monitor).
- Accelerate until the vehicle reaches 35-40 MPH (56-64 km/h), and travel for 20 seconds or more. Repeat steps 4 and 5 , completing 8 monitor sessions.
- Return the vehicle to the shop and turn the ignition switch to LOCK position.
- Check for DTCs.
- If DTC P0401 resets, go to DTC P0401: EXHAUST GAS RECIRCULATION FLOW INSUFFICIENT DETECTED under DIAGNOSTIC TESTS.