EVAP System - Evap. Testing

SOURCE: Kia Technician Times

TITLE: Evap System Testing

APPLIES TO: 00- Sephia/Spectra

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When testing evap. leaks on DM-TL (Diagnostic Module-Tank Leakage) systems, the hardest part may be determining if the DM-TL itself is leaking or another part of the system. After performing a visual inspection and running an evaporative leakage test with the Hi-Scan Pro, if a small or large leak code resets you may want to test the DM-TL by itself. The best way to check the DM-TL is to isolate it from the rest of the system by plugging the hose from the DM-TL at the charcoal canister, then clear codes and run another test. See the following for test results.






Remember that this system tests by monitoring the current draw of the DM-TL as the pressure in the fuel tank increases. When blocking off the hose from the DM-TL, the current ramps up so quickly (if there is no leakage) that the ECM aborts the test right after the changeover valve cycles. The Monitoring Test Results in the Hi-Scan Pro also may be of some help when analyzing a test failure (see the following sample test result screens). Go to Monitoring Test Results, OBD Monitoring Test, Evap. Emission Monitoring. The line labeled Data is the measured current draw of the DM-TL during the test. The line labeled Limit is the reference current that set at the beginning of the test. If the data current is lower than the limit current, the system (in this case the DM-TL) has a leak. If the data current is higher than the limit current, then no leaks are present. Remember to clear any pending DTCs before releasing the vehicle.