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EVAP System Monitor Repair Verification Drive Cycle

  1. Perform VEHICLE PREPARATION FOR DRIVE CYCLES .
  2. Verify the FTP  PID reads between -0.5 and +0.5 in H2O with the gas cap removed. Reinstall gas cap.
  3. Drive the vehicle at a constant speed between 35 and 65 mph (56 and 104 km/h) with throttle as steady as possible. Observe the Oxygen Sensor Monitor until its status changes NO to YES using ON-BOARD SYSTEM READINESS TESTS menu.
  4. Bring the vehicle to a stop (engine running) and access the following PIDs: IAT, FLI, FTP, EVAPPDC, EVAPCV  .
  5. Verify the following EVAP monitor entry condition immediately after vehicle is stopped: IAT  PID between 50-100° F (10-38°C).
  6. Drive the vehicle on the highway with a constant speed over 40 mph (64 km/h) with throttle as steady as possible. During this time, verify the following additional EVAP monitor entry conditions using the FLI  and FTP  PIDs.
    • FLI  stable +/- 5% between the limits of 15% and 85% tank fill.
    • FTP  stable within +/-0.5 in H2O.
  7. Prior to running the EVAP monitor (when the EVAPPDC  PID is less than 75%) the canister vent solenoid is open and the system is unsealed. To initiate the EVAP monitor, the EVAPPDC  PID must increase to at least 75%. At this time, the EVAPCV  PID will then display 100% (canister vent solenoid closed to seal the system) and the monitor will begin to run. Continue to drive at steady throttle with light steering until the EVAPCV  PID displays 0% (canister vent solenoid open, system unsealed).
    • If this step does not occur as described, proceed to the following note, otherwise proceed to next step.
    NOTE:
    • During the drive cycle or hot ambient temperatures, fuel vapor (from the canister and/or tank) may keep the test from starting. This can be observed on the NGS tester when either:
      1. EVAPPDC  PID never reaches 75% with stable FLI  and FTP  PID readings.
      2. EVAPCV  PID never goes to 100% (canister vent never closes) when EVAPPDC  PID is above 75%.
  8. Bring the vehicle to a stop (engine running) and access the ON-BOARD SYSTEM READINESS TESTS menu to check completion status.
    • If completed, Evaporative Purge system monitoring status changes from NO to YES.
    • If not completed, repeat from step 7 at least one more time.
  9. Verify no DTCs are available with exception of P1000.
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