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EVAP Running Loss Monitor System Repair Verification Drive Cycle

  1. Perform the preparation for OBD II drive cycle section. See VEHICLE PREPARATION FOR OBD-II OR MONITOR REPAIR VERIFICATION DRIVE CYCLE  under DRIVE CYCLES.
  2. With the scan tool, verify the FTP V PID reads between 2.4 and 2.8 volts with the gas cap removed. Reinstall gas cap.
  3. With the scan tool, view the OBD II monitors through the ON-BOARD SYSTEM READINESS menu.
  4. Drive the vehicle at a constant speed between 35 MPH (56 km/hr) and 65 MPH (104 km/hr) with throttle as steady as possible. Observe the HO2S monitor on the scan tool until it completes, or refer to FUEL MONITOR OR HO2S MONITOR REPAIR VERIFICATION DRIVE CYCLE .
  5. Bring the vehicle to a stop and access the following PIDs with the scan tool:
    • IAT, FLI, FTP, V, EVAPPDC, EVAPCV.
  6. Verify the following EVAP monitor entry condition:
    • IAT between 50-100°F (10-38°C).
  7. Drive the vehicle on the highway with a constant speed over 64 km/hr (40 MPH) with throttle as steady as possible. During this time, verify the following additional EVAP monitor entry conditions using the FLI and FTPV PIDs:
    • FLI stable +/- 5% between the limits of 15% and 85% tank fill.
    • FTP V stable within +/-0.1 volt.
  8. 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. The following be observed on the scan tool when either:
    • The EVAPPDC PID never reaches 75% with stable FLI and FTP PID readings.
    • The EVAPCV PID never goes to 100% (canister vent never closes) when the EVAPPDC PID is above the 75% minimum to start the test.
  9. Bring vehicle to a stop.
  10. With the scan tool, view the EVAP monitor for completion through the On-Board System Readiness Menu. Repeat  7 if the EVAP monitor is not complete.
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