Checking injection timing control range via final control diagnosis — VW

Checking injection timing control range via final control diagnosis
The control range of the injection timing adjuster can be checked with the aid of final control diagnosis and simultaneously calling-up measured value block 04. To do this the control element for
“commencement of injection valve -N108”
must be activated and then final control diagnosis exited by pressing key
“C”
. Using this procedure, the commencement of injection valve continues to be pulsed so that the control range of the injection timing adjuster can be read with the aid of measured value block 004 (display zone 3).
Note
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
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
4
for
“Display group number 4”
and confirm entry with
Q
key.
Indicated on display:
Read measured value block 4 ->
840 rpm 0.9° BTDC 0.9° BTDC 3%
The displays in display zones 3 and 4 must fluctuate within following control range:
Engine code ACV
Specification: Display zone 3, lower range 1° ATDC…4.8° BTDC, upper range 12.0…17° BTDC
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 that the lowest numerical value in display zone 3 lies between 1.0 and 4.8 and the highest between 12.0 and 17, and 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 commencement of injection valve electrically
Chapter
.