13 63 544 - Throttle switch - adjust < 13 - Fuel System < BMW 728 - 745i
 
From model '83
ADJUSTING THROTTLE SWITCH
Check throttle switch.
There should be approximately 0 ohm
between connections 2 and 18 with a closed
throttle valve.
There should be approximately 0 ohm
between connections 3 and 18 with the
throttle valve wide open.

LL = Idle speed
VL = Full load

3013631 - click to zoom
 
Adjusting:
There should be approximately 0 ohm
between connections 2 and 18 with a closed
throttle valve.
Adjust by loosening screws (1) and turning
the throttle switch.
Open throttle valve after finishing the
adjustment - resistance must rise immediately
to ohms.
The resistance should drop back to approx.
0 ohm after releasing the throttle valve.

2813033 - click to zoom
 
Adjusting Idle Speed Switch:
Pull off rubber protective cap.
Pull off plugs (1 and 2).
Connect ohmmeter on plug connections.
Loosen screws (4 and 3).
Move switch until ohmmeter displays approx.
0 ohm.
Tighten screws (4 and 3).
Operating the throttle valve must cause the
idle speed switch to switch immediately and
have a resistance of approx. ohms.

281363004 - click to zoom
 
Checking/Adjusting Throttle Potentiometer:
Pull off multiple-pin plug on transmission
control unit.
Connect test adapter with test lead between
control unit and wire harness.
Turn on ignition.
Accelerator pedal in full load position as well
as kickdown.

Transmission Control Unit:
Measure and note power supply value between terminals 9 (+) and 6 (-).
Measure and note power supply value between terminals 7 (+) and 6 (-).
The adjusting voltage should be 0.22 ± 0.04 V less than the power supply voltage value.

1363007 - click to zoom
 
Adjusting:
Correct by loosening screws (2) of throttle
potentiometer and turning the throttle potentiometer.

- Checking Potentiometer:
The voltage on the test point of the potentiometer must rise linear up to the adjusting value
when opening the throttle valve from the idle stop to the full load stop.

- The throttle valve lever must bear on the full load stop when the accelerator pedal is floored
(including kickdown).

281363003 - click to zoom