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Servicing Diesel direct injection system
Adapting idling speed
Special tools, workshop equipment, testers, measuring instruments and auxiliary items required
◆ VAS 5051 Vehicle diagnosis, testing and information system
◆ Diagnosis cable VAS 5051/1 or VAS 5051/3
Note:
The idling speed can be adjusted within preset tolerances.
Work sequence
‒ Connect Vehicle Diagnosis, Testing and Information System VAS 5051 and select engine electronics control unit with the "Address word" 01. When doing this the engine must be running at idling speed.
(Connecting fault reader and selecting engine electronics control unit => page 23-36).
→ Indicated on display: Rapid data transfer HELP
Select function XXX
‒ Press keys 1 and 0 for function "Adaption" and confirm entry with Q key.
→ Indicated on display: Adaption
Feed in channel number XX
‒ Press keys 0 and 2 for "Channel number 2" and confirm entry with Q key.
→ Indicated on display: Channel 2 Adaption 32768 ⇒
800 rpm 0.0 % 0 01 00 88.4 5C
Ensure the specifications for the idling speed are kept whilst performing the adaption.
Specification: 700...840 rpm
There are two possibilities for changing the adaption values:
Progressive adaption
The adaption value for the idling speed can be increased or decreased in steps by pressing the buttons 1 and 3 on fault reader V.A.G 1551.
→ Indicated on display: Channel 2 Adaption 32768 ⇒
# 1 3 %
Display group
V.A.G 1551
V.A.G 1552
Higher
Press key 3
Press ↑key
Lower
Press key 1
Press ↓key
→ Indicated on display: Channel 2 Adaption 32756 Q
790 rpm 0.0 % 0 01 00 88.4 5C
‒ Press the Qkey.
→ Indicated on display: Channel 2 Adaption 32756 Q
Store modified value?
‒ Press the Qkey.
→ Indicated on display: Channel 2 Adaption 32756 ⇒
Modified value is stored
‒ Press the ⇒key.
‒ Press keys 0 and 6 for the function "End output" and confirm entry with the Q key.
‒ Switch off ignition.
Direct adaption
The adaption value for the idling speed can be entered directly after pressing the ⇒key.
‒ Press the ⇒key.
→ Indicated on display: Channel 2 Adaption 32768 ⇒
Enter adaption value XXXXX
‒ Enter new adaption value and confirm entry with Q key.
→ Indicated on display: Channel 2 Adaption 32756 Q
790 rpm 0.0 % 0 01 00 88.4 5C
‒ Confirm entry with Q key.
→ Indicated on display: Channel 2 Adaption 32756 Q
Store modified value?
‒ Press the Qkey.
→ Indicated on display: Channel 2 Adaption 32756 ⇒
Modified value is stored
‒ Press the ⇒key.
‒ Press keys 0 and 6 for the function "End output" and confirm entry with the Q key.
‒ Switch off ignition.