Skoda Octavia 1997 Workshop Manual page 56

23
–
Connect vehicle system tester -V.A.G 1552-. Start en-
gine and select address word 01 „Engine electronics"
Chapter 01-1.
–
Enter function 04 „basic setting" and select display
group number number 003.
Note
After selecting display group number 003 and confirming
with , the idling speed is increased by the engine con-
Q
trol unit in display field 1 to 1380...1420 rpm.
Readout on display:
The display in display field 2 must switch between EGR
not active and EGR active every 10 seconds.
The readouts in display field 3 and 4 must vary within the
following control range:
Note
If a constant value of 539 mg/H and higher is shown in
display field 3, test the air mass meter.
EGR not active:
Specified value display field 3: 410...600 mg/stroke
nominal value, display field 4: 18...22 %
EGR active:
Specified value display field 3: 160...310 mg/stroke
nominal value, display field 4: 63...67 %
If the specified values are not reached:
–
Test mechanical exhaust gas recirculation valve
1.9 l/74 kW (TDI) Engine, Mechanical Compo-
nents; Rep. Gr. 26.
–
Inspect the connection diagram for the vacuum hoses
23-4 page 1.
–
Test exhaust gas recirculation valve -N18-
01-1.
23-4 2
page
OCTAVIA 1997 1.9 l/74 kW (TDI) Engine, Fuel Injection and Glow Plug System
Chap.
Testing exhaust gas recirculation
System in basic setting 3
1400 rpm EGR not active
->
500 mg/H 20 %
Edition 04.03
S00.5139.51.20