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 in OFF position.
Monitor takes about 10 minutes to complete. This drive must be completed twice. 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.
- Start the engine.
- Accelerate until the vehicle speed reaches 35-40 mph.
- Travel for 20 seconds or more while keeping the vehicle speed at 35-40 mph (M/T: 4th speed).
- Fully close the throttle from an engine speed of 2000-3000 RPM, and while keeping the clutch engaged, decelerate to approximately 900 RPM without applying the brakes. Do not steer the handle or turn the light ON/OFF during this time. (During monitor).
- Accelerate until the vehicle speed reaches 35-40 mph, and travel for 20 seconds or more (M/T: 4th speed). Then, repeat steps 5 and 6 for eight monitor sessions.
- Return the vehicle to the shop and turn the ignition off.