lock AUDI A8 1997 D2 / 1.G AEB Engine EVAP System Checking
[x] Cancel search | Manufacturer: AUDI, Model Year: 1997, Model line: A8, Model: AUDI A8 1997 D2 / 1.GPages: 12, PDF Size: 0.1 MB
Page 4 of 12

24-139
      
Evaporative Emission (EVAP) Canister 
Purge Regulator Valve, checking
 
     
Required special tools and test equipment  
     
VAG 1551 or VAG 1552 Scan Tool (ST) with 
VAG 1551/3 adapter cable 
     
Test conditions  
     Engine coolant temperature at least 80 C 
(176 F) 
     
Function check  
     
-  Connect VAG 1551 or VAG 1552 scan tool and 
press buttons -0- and -1- to insert "Engine 
Electronics" address word 01 (with engine 
running at idle)   Page 01
-7 . 
Rapid data transfer 
HELP
Selectin
g function XX
    
Indicated on display  
-  Press buttons -0- and -8- to select "Read Measuring Value Block" 
function 08, and press -Q- button to confirm input. 
Read Measurin
g Value Block 
HELP
Input displa
y group number XXX
    
Indicated on display  
-  Press buttons -0-, -7- and -0- to input display group number 70, and 
press -Q- button to confirm input. 
Pa
ge 4 of 12 Eva
porative Emissions 
(EVAP
) system, checkin
g
11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU02.24.4 
Page 5 of 12

Read Measuring Value Block 70 1 2 3 4 
    
Indicated on display (1-4 = display fields)  
Pa
ge 5 of 12 Eva
porative Emissions 
(EVAP
) system, checkin
g
11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU02.24.4 
Page 7 of 12

24-141
 
  
Display fields  
  
1   2   3   4  
Display group 70: EVAP canister purge regulator valve  
Display   xxx %   xx.x %   xx.xx g/s   Test OFF/Test 
ON  
EVAP OK  
EVAP notOK  
Indicated   EVAP canister purge regulator 
valve duty cycle during diagnosis  Oxygen sensor deviation 
during diagnosis  Idle Air Control (IAC) valve 
deviation during diagnosis  Diagnosis 
condition  
Diagnosis 
results  
Range   0-100 %   -25.0 to 25.0 %   -2.70 to 4.16 g/s   ---  
Specified 
value  0-100 %   - 5.4 to 9.4 %   0.00-0.33 g/s   EVAP OK        If "EVAP notOK" is indicated in display field 4:  
     
-  Check for blockage or leaks   Page 24
-142
 .
      If "EVAP OK" is indicated in display field 4:  
     
- 
Press   button to advance program 
sequence. 
Pa
ge 7 of 12 Eva
porative Emissions 
(EVAP
) system, checkin
g
11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU02.24.4 
Page 9 of 12

24-142
      
Checking for blockage and leaks  
      The EVAP canister purge regulator valve is 
closed when power is off.  
     
-  Remove EVAP canister purge regulator valve -
N80- (component locations   Page 24
-1 ) 
     
-  Connect removed valve to harness connector.
     
-  Start output Diagnostic Test Mode (DTM) and 
select -N80-   Page 01
-42
 . 
     
-  Blow into long connection during output DTM, 
and check whether valve opens and closes 
properly. Replace valve if necessary. 
     
-  If valve is OK, check all hose connections 
between tank and valve for blockage or leaks. 
     
EVAP canister purge regulator valve -N80- 
electrical test  
     
-  Disconnect harness connector from EVAP 
canister purge regulator valve. 
    
-  Connect multimeter US 1119 (Fluke 83 or equivalent) and check 
resistance at across valve terminals. 
Pa
ge 9 of 12 Eva
porative Emissions 
(EVAP
) system, checkin
g
11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU02.24.4