Exhaust Gas Recirculation Monitor
This monitor applies to DTC P0401. Following conditions must be met during the test:
- Engine Coolant Temperature Is 176°F (80°C) Or More
- Atmospheric Temperature Is 41°F (5°C) Or More
- Selector Lever Is In "D" Range
- A/C Switch Is In OFF Position
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. To run monitor, use illustration. See Fig 1 . This monitor must be performed twice. Perform steps as follows:
- Start the engine and allow it to reach 176°F (80°C).
- Accelerate vehicle to 35-45 MPH.
- Travel 20 seconds or more while keeping vehicle speed at 35-40 MPH (4th gear on M/T).
- Decelerate vehicle by closing throttle fully 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 (this is when monitor runs).
- Accelerate vehicle 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 switch to LOCK position.
- Recheck for DTCs. If DTC P0401 resets, return to DTC P0401: EXHAUST GAS RECIRCULATION INSUFFICIENT FLOW DETECTED under DIAGNOSTIC TESTS.