EVAP Running Loss System Repair Verification

1. Perform the Vehicle Preparation for OBD II Drive Cycle.
2. With the scan tool, verify the FTP, (FTP V) PID reads between -0.5 and +0.5 in H2O (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 56 km/hr (35 mph) and 104 km/hr (65 mph) with throttle as steady as possible. Observe the HO2S monitor on the scan tool until it completes (or refer to the 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, FTP V, EVAPPDC, EVAPCV. If the EVAPCV PID is not available, measure the duty cycle of the EVAPCV circuit with a multimeter.
6. Verify the following EVAP monitor entry condition: IAT between 10-38°C (50-100°F).
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 (FTP V) stable within ±0.5 in H20 (±0.175 volts).
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 Step 9.

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 scan tool when either:
(1) The EVAPPDC PID never reaches 75% with stable FLI and FTP PID readings.
(2) 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 the vehicle to a stop.
10. With the scan tool, view the EVAP monitor for completion through the On-Board System Readiness Menu. Repeat Step 7 if the EVAP monitor is not complete.