38
Subsystems of the Motronic
SSP 198/12
Accelerator position senders G79
and G185
The accelerator position sender transfers an
analog signal corresponding to the accelerator
position to the Motronic. To ensure that the
electronic accelerator functions reliably, the
accelerator position sender has two
independent potentiometers (G79 and G185).
They have different characteristic curves (see
diagram).
The control unit monitors the two senders G79
and G185 for proper functioning and
plausibility.
If a sender fails, the other sender serves as a
substitute.
The accelerator position sender transfers the
driver’s inputs to the Motronic and provides
kickdown information to the automatic
gearbox.
Lever
Acc. position sender
Accelerator
There is no separate switch for
kickdown information. Integrated in
the accelerator position sender is a
“mechanical pressure point “ which
conveys an authentic “kickdown feel”
to the driver.
When the driver operates the
kickdown, the full-load voltage of the
accelerator position sender is
exceeded. If a voltage defined in the
engine control unit is attained in the
process, this is interpreted as a
kickdown and transferred to the
automatic gearbox (via CAN-Bus).
The accelerator position senders for
the manual gearboxes and automatic
gearboxes are identical. Kickdown is
enabled or disabled via the
accelerator limit stop (refer to chapter
on “TDI engines”).
SSP 198/25
Resistance in
Ω
Accelerator travel
G79
G185
LL
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