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Home >> Ford >> 1997 >> RV Cutaway 7.3 F >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 7.3L Diesel >> Additional System Functions >> Drive Cycle Procedure >> Performing Drive Cycle

Performing Drive Cycle

  1. Turn ignition on, but do not crank engine until WAIT TO START light turns off, or 10 seconds has passed (whichever is greater).
  2. Start engine. Allow engine to idle with transmission in Park for 40 seconds.
  3. The following conditions must be followed to run certain OBD-II monitors that require engine to be under a load. Depress OVERDRIVE switch (overdrive mode off) to perform test in 3rd gear. Turn on accessories (headlights, A/C compressor, blower fan, etc.). DO NOT use hazards or PTO. Select an uphill or level road. DO NOT select a downhill road. Driving downhill will unload engine and defeat test.
  4. Accelerate steadily to 3rd gear and keep engine speed at 1500 RPM for 3 seconds. Accelerate steadily from 35 MPH to 65 MPH in about 15 seconds. Repeat this procedure 3 times while maintaining conditions set in step 3). Before proceeding, turn all accessories off and depress OVERDRIVE switch (overdrive mode on). On A/T models, go to next step.
  5. On A/T models, drive vehicle in 4th gear continuously for one minute. Accelerate steadily from a full stop to 4th gear and then return to a full stop. Repeat this procedure 10 times, then go to next step.
  6. Before continuing, use scan tool and select EOT PID from PID/DATA monitor menu. Ensure EOT PID value is more than 140°F (60°C). Allow engine to idle for 20 seconds in Park. Turn ignition off. State engine. Allow engine to idle for 40 seconds in Park. Repeat QUICK TEST . Drive cycle is complete.
  7. If P1000 is present after performing drive cycle, repeat step 4) maintaining a minimum MFDES PID value of 37 milligrams/stroke with engine speed at more than 1500 RPM for 11 seconds. Also, repeat step 6). MFDES PID value must remain less than 12 milligrams/stroke for 11 seconds.
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