Checking exhaust gas recirculation and air mass meter function via final control diagnosis — VW

Checking exhaust gas recirculation and air mass meter function via final control diagnosis
The exhaust gas recirculation and air mass meter functions can be checked with the aid of final control diagnosis and simultaneously calling-up measured value block 003. To do this the control element for
“exhaust gas recirculation valve -N18”
must be activated and then final control diagnosis exited by pressing key
“C”
. Using this procedure, the exhaust gas recirculation valve continues to be pulsed so that the extreme values for exhaust gas recirculation (air mass meter) can be read with the aid of measured value block 003 (display zone 3).
The individual control elements are activated for 30 seconds only. In the subsequent procedure you must make several entries within this period on the fault reader and must also read off the measured values. Therefore, read through the following steps first and familiarise yourself with the procedure.
Press
→
key.
Indicated on display:
Rapid data transfer HELP
Select function XX
Press keys
0
and
3
for function
“Final control diagnosis”
.
Indicated on display:
Rapid data transfer Q
03-Final control diagnosis
Confirm entry with
Q
key.
Indicated on display:
Final control diagnosis ->
Commencement of injection valve N108
Press
→
key.
Indicated on display:
Final control diagnosis ->
Exhaust gas recirculation valve N18
Press
C
key.
Press keys
0
and
8
for function
“Read measured value block”
and confirm entry with
Q
key.
Indicated on display:
Read measured value block HELP
Input display group number XXX
Press keys
0
,
0
and
3
for
“Display group number 3”
and confirm entry with
Q
key.
Indicated on display:
The displays in display zones 3 and 4 must fluctuate within following control range:
Read measured value block 3 ->
840 rpm 272 mg/H 268 mg/H 54%
Engine code ACV:
Specification: Display zone 3, lower range 230...310 mg/stroke, upper range 360...480 mg/stroke
Specification: Display zone 4, lower range 2...5%, upper range 90...95%
The measured values which are displayed vary extensively due to the sluggishness of the fault reader display. Therefore, ensure only that the lowest numerical value in display zone 3 lies between 230 and 310 and the highest between 360 and 480, and the lowest numerical value in display zone 4 lies between 2 and 5 and the highest value between 90 and 95.
If the specifications are not attained:
Check mechanical exhaust gas recirculation valve
Rep. Gr. 26; Exhaust gas recirculation system; Checking exhaust gas recirculation valve
Check air mass meter and exhaust gas recirculation valve
Chapter
.
If the specifications are attained:
Press
→
key.
Carry out a road test
Chapter
.