Fuel Trim Monitor
This monitor applies to DTCs P0171 and P0172. Following conditions must be met during the test:
- Engine coolant temperature is 176-207°F (80-97°C).
- Atmospheric temperature is 14-140°F (-10-60°C).
- Selector lever is in "D" range A/T.
Monitor takes about 35 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 is 55-60 mph.
- Travel for 30 minutes or more while keeping the vehicle speed at 55-60 mph (M/T: 5th speed). Carry out one gradual deceleration/acceleration returning to 55-60 mph within 120 seconds (during monitor).
- Return the vehicle to the shop and turn the ignition off.