Evaporative Emissions (EVAP) System Diagnosis using KLI9210 EVAP Tester: Description

WARNING: This page is about a different car, the 1999 Audi A8, 1998 Audi A8, and 1997 Audi A8. However, it is still accessible from the selected car via links, so may be relevant.

The leak detection threshold has recently changed from 1.0 mm (0.040 in.) to 0.5 mm (0.020 in.). These changes to EPA regulations regarding EVAP system integrity indicated that additional resources for more accurate EVAP system diagnosis are necessary.

The KLI9210 EVAP Tester allows testing using nitrogen to pressurize the EVAP system and a smoke generator or ultrasonic tester to locate the source of EVAP system concerns.

The following procedure will outline general use of the KLI9210 EVAP Tester. It is intended as a guideline, as EVAP systems vary between models.

Test EVAP system using Leak Detection Pump (LDP) - V144- (m.y. 1998 and later)

For vehicles without LDP, proceed to "Perform EVAP tester self-test".

For vehicles with LDP:

Perform leak test using VAS 5051 Scan Tool and Basic Setting mode.

If vehicle fails above test ("System not OK"):

Verify fuel cap is properly closed; repeat test.

If "System OK" after re-test:

Erase DTC memory (if necessary).
Repeat test several times to ensure proper EVAP system operation (remove and re-install fuel cap before each test).
Perform quality check and return vehicle to customer.

NOTE: If the vehicle passes the above EVAP system, test, DTCs may be sporadic; the entire EVAP system should be carefully inspected.

If VAS 5051 continues to indicate "System not OK" after re-test, proceed to next step.