EVAP Running Loss System Drive Cycle
WARNINGSTRICT OBSERVANCE OF POSTED SPEED LIMITS AND ATTENTION TO DRIVING CONDITIONS ARE MANDATORY WHEN PROCEEDING WITH THE FOLLOWING DRIVE CYCLE.
1. Attach a scan tool and perform a PCM reset (clear continuous codes) to bypass the minimum soak timer. Leave the key in the On position and start the vehicle. Once started, the engine must not be turned off. If the engine is turned off, it will be necessary to perform a PCM reset and start over.
2. Use the scan tool to access the ECT, FLI, IAT, FTP V, EVAPPDC, EVAPCV, VSS, and DTC CNT Parameter Identification Displays (PIDs). Warm the vehicle until the ECT reaches a minimum of 54°C (130°F).
3. Remove the gas cap and verify that the FTP voltage reads between 2.4 and 2.8 volts. If voltage is not in this range, refer to the latest PC/ED Service Manual diagnostics contained on SBDS or SBTS for FTP diagnostics (Pinpoint Test Step HX22); otherwise, reinstall the gas cap and proceed to Step 4.
4. Drive the vehicle on a smooth road at a constant speed between 64 and 105 km/h (40 and 65 mph) with the throttle as steady as possible. During this time, verify the following EVAP monitor entry conditions:
^ FLI between 15 and 85% and stable +/- 5% (fuel may need to be added or removed) FTP V stable within +/- 0.1 volts
^ IAT between 10 and 38°C (50 and 100°F)
5. While continuing to drive at a constant speed (between 64 and 105 km/h (40 and 65 mph)), monitor the EVAPPDC, EVAPCV and FTP V PIDs. The EVAPPDC will increase to at least 75% and then return to 0%. EVAPPDC will again increase to at least 75% and then return to 0%. The third time the EVAPPDC increases to at least 75%, the EVAPCV will change from 0% to 100% (CV solenoid closed) to seal the system, the EVAPPDC will then return to 0%, and the leak test will begin to run. At this time, the FTP V should be stable at 1.2-1.6 volts (if the FTP V does not remain stable, then a small leak has been detected).
Continue to drive at steady throttle with light steering until the EVAPCV displays 0%. Monitoring the DTC CNT will help determine if a DTC is set. If this does not occur as described, refer to the following Note; otherwise proceed to Step 6.
NOTE
^ THE EVAP MONITOR LEAK TEST MAY RUN ON THE FIRST OR SECOND TIME THE EVAPPDC INCREASES TO MORE THAN 75% IF THE AMOUNT OF FUEL VAPOR IN THE FUEL TANK THAT HAS BEEN DETECTED BY THE EEC IS LOW.
^ THE EVAP MONITOR WILL NOT RUN IF THE H025 MONITOR HAS NOT COMPLETED (VIEW THE ON-BOARD SYSTEM READINESS TESTS TO DETERMINE IF THE MONITOR HAS COMPLETED).
^ IF THE EVAP MONITOR ENTRY CONDITIONS DESCRIBED IN STEP 4 ARE NOT MAINTAINED, THEN THE EVAP MONITOR WILL NOT CONTINUE TO RUN.
^ IF THE EVAPPDC STAYS AT 99% AND THE FTP V DOES NOT REACH 1.2-1.6 VOLTS, THEN THE EVAP MONITOR HAS DETECTED A LARGE LEAK (DTC P0455 WILL BE SET).
^ IF THE FTP V DOES NOT REMAIN STABLE AT 1.2-1.6 VOLTS (INCREASES MORE THAN 0.4 VOLTS) WHILE THE EVAP MONITOR IS RUNNING, THEN THE PCM WILL RETRY THE LEAK TEST A MAXIMUM OF THREE (3) TIMES. IF THE EVAP MONITOR LEAK TEST FAILS ALL THREE TIMES, THEN A VAPOR GENERATION CHECK WILL BE PERFORMED. IF VAPOR GENERATION HAS NOT BEEN DETECTED, THEN THE EEC HAS DETERMINED THERE IS A SMALL LEAK (DTC P0442 WILL BE SET).
^ IF ANY DTCs ARE SET, FOLLOW THE LATEST PC/ED SERVICE MANUAL DIAGNOSTICS CONTAINED ON SBDS OR SBTS.
6. Bring the vehicle to a stop.
7. With the scan tool, view the On-Board System Readiness Tests to determine if the EVAP Monitor has been completed. If the EVAP Monitor has completed and there are no continuous DTCs, then the PCM has not detected any concerns. Repeat this Drive Cycle if the EVAP Monitor has not completed and there are no continuous DTCs in memory.