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HOMESERVICE MANUALSMITSUBISHI2001MONTERO XLSREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - SELF-DIAGNOSTICSVERIFYING REPAIRSOBD-II DRIVE CYCLESEGR MONITOR
2001 Mitsubishi Montero XLS

EGR Monitor

2001 Mitsubishi Montero XLSSECTION EGR Monitor

This monitor applies to DTC P0400. 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/C switch is in OFF position.

Monitor takes about 10 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. After engine is completely warmed up, turn ignition off.
  3. Start engine and quickly accelerate to 35-40 MPH.
  4. Keep speed constant at 35-40 MPH for 20 seconds or more.
  5. Decelerate by closing throttle fully and 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.
  6. Accelerate to 35-40 MPH, then hold speed constant for 20 seconds or more. Repeat steps  4 and  5 seven more times.
  7. Return vehicle to shop and turn ignition off.

Fig 1: Running EGR Monitor
G99J52604Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.