EVAP System Monitoring: Leakage Detection: Notes

Kia applies an improved leakage detection module (heated type) in 2001 model year of Sephia and Spectra.

Using the heated DM-TL (Diagnostic Module Tank Leakage) can completely eliminate the humidity influence. So, the leakage detection is never stopped caused by the current fluctuation (due to dew effects at extreme high humidity).

The heating element is inserted into pump hosing. Diagnosis of the heater of DM-TL is checked by circuit malfunction.

Fig 1: Illustrating EVAP System Operation

Courtesy of KIA MOTORS AMERICA, INC.

The heated DM-TL (Diagnostic Module Tank Leakage) is used to monitor the evaporative system for leaks.

The diagnostic module consists of an air filter, an heating element, an electrical driven air pump, a change-over valve and a 0.02 inch orifice for reference measurement as shown in the following figure.

Fig 2: Illustrating Diagnostic Tank Leakage Module

Courtesy of KIA MOTORS AMERICA, INC.