Throttle Position Sensor: Adjustments

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

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 infinite ohms.
- The resistance should drop back to approx. 0 ohm after releasing the throttle valve.

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. infinite ohms.

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 1 0,04 V less than the power supply voltage value.

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).