Heated Oxygen Sensor Monitor

This monitor applies to DTCs P0130, P0136, P0150 and P0156. Following conditions must be met during the test:

• Engine coolant temperature must be 176°F (80°C) or more.
• Atmospheric temperature is 14°F (-10°C) or more.
• If automatic transmission, selector lever is in "D" range.
• If applicable, overdrive switch is in ON position.
• If applicable, pattern select switch is in OFF position.

Monitor takes about 5 minutes to complete. To run monitor, use illustration. See Fig 1. Perform steps as follows:

1. Remove all test equipment from vehicle and install all components and connectors that were removed or disconnected during testing.
2. Start engine.
3. Accelerate to 35-40 MPH.
4. While keeping accelerator pedal opening degree constant, keep speed at 35-40 MPH for 120 seconds or more (M/T: 4th gear).
5. Return vehicle to shop and turn ignition off.
6. Confirm DTC is not output. If DTC is output, go to appropriate DTC test in appropriate SELF-DIAGNOSTICS article.

Fig 1: Running Heated Oxygen Sensor Monitor

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.