Fuel Trim Monitor
This monitor applies to DTCs P0170 and P0173. Following conditions must be met during the test:
- Engine coolant temperature is 176-207°F (80-97°C).
- Atmospheric temperature is 14°F or more.
- Selector lever is in "D" range.
Monitor takes about 35 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 off ignition.
- Start engine and quickly accelerate to 55-60 MPH.
- Drive at 55-60 MPH for 30 minutes or more. During this period DO NOT drive at constant speed for more than 2 minutes. Carry out gradual deceleration and acceleration within every 120 second time frame. Depressing brake pedal is okay, but avoid abrupt braking.
- Return vehicle to shop and turn ignition off.