Volkswagen Golf / Golf GTI / Jetta. Manual - part 103

26-50

 

     If test is OK:  

LDP has activated and the system is 
pressurized.  

If the test aborts and DTCs other 
than for small or large leaks are 
stored:  

When "Check end" is indicated on 
VAS 5051 or VAS 5052:  

Note:  

Only check LDP during "Check end" 
phase when "Test OK" was 
indicated. 

   Indicated by "1" in position 6 and 

a "0" in position 8 as shown. 

-  Using a compressed air blow gun, 

clear area near LDP and LDP 
filter of any residual smoke. 

-  Check and repair according to 

DTC listed in DTC table for 
appropriate engine code. 

-  Use smoke generator trigger to fill 

system with smoke again. 

-  Check for smoke doming from 

LDP filter and LDP hose 
connections. 

 

 Smoke coming from filter 

indicates a faulty LDP 

 

 Smoke coming from LDP 

outlet or hose indicates a 
faulty hose or clamp 

Secondary air system

26-51

 

  

  

-  Make repairs as necessary and check with 

smoke again. 

  

  

 

 No smoke coming from filter indicates LDP 

is OK and leak is somewhere else in EVAP 
system 

  

  

Note:  

  

  

If the KLI 9210 EVAP system tester is connected 
in "Test" mode and Basic settings (using Self 
Diagnosis) and Fault finding are activated, a 
false "System OK" message may be generated.

  

  

If the LDP is OK and a DTC was stored for the 
EVAP system:  

  

  

-  Switch ignition off. 

  

  

-  Continue checking EVAP system as follows:

  

  

Checking EVAP system for leaks  

    

CAUTION!

 

Clamp only soft rubber lines when isolating a 
leak. To avoid risk of damage, never clamp hard 
plastic lines!

 

-  Clamp off LDP outlet (EVAP side) -1- using 

special tool 3094 or equivalent. 

-  Turn control valve from "Hold" to "Test".  

-  Allow fuel system to pressurize. 

Secondary air system

26-52

 

  

   Note:  

  

   Fuel system pressurization depends on volume 

of fuel system and amount of fuel in tank. 

  

   If fuel system pressurization does not stabilize:  

  

  

-  Verify that all fuel system outlets have been 

sealed before continuing. 

  

   Note:  

  

   Any flow shown on flow meter indicates a leak. 

Flow below flow meter flag set at vehicle leak 
standard may indicate a sporadic DTC. 

  

   If flow meter on tester registers flow near or 

above pre-set pressure:  

  

  

-  Clamp off hose leading from EVAP canister 

purge regulator valve -N80- to intake manifold. 

  

   If flow stops:  

  

  

-  Replace EVAP canister purge regulator valve -

N80- and repeat test before continuing. 

  

   If meter indicates no flow after test:  

  

  

-  Perform quality check and return vehicle to 

customer. 

  

   If flow continues:  

  

  

-  Use smoke generator trigger to charge fuel 

system with smoke again. 

Secondary air system

26-53

 

  

  

-  Inspect complete EVAP system for escaping 

smoke. 

  

  

Note:  

  

  

It may be necessary to move, twist, or wiggle 
EVAP components around to reproduce leak.

  

  

If leak cannot be found using smoke:  

    

If leak cannot be located:  

CAUTION!

 

Clamp only soft rubber lines when isolating a 
leak. To avoid risk of damage, never clamp hard 
plastic lines!

 

If flow stops:  

When leak has been located:  

-  Locate leak with ultrasonic tester. 

 

 General search: tester only 

 

 Localized search: tester with extension 

wand (left) 

-  Disconnect and plug or clamp shut EVAP lines 

to isolate fuel tank using special tool 3094 or 
equivalent before continuing. 

-  Reconnect EVAP lines and search area that was 

isolated. 

-  Repair leak and repeat EVAP system test.

Secondary air system