AlexTD4

Member

• Sep 20, 2014

• #1

Hey guys,

I was hoping you happen to know the correct output signal voltages on the throttle potentiometer.

The car is '02 Freelander TD4 with 2.0l BMW diesel engine.

I know it's a "dual" potentiometer, it has 6 wires coming out, 3 wires for each potentiometer, power supply, ground and signal wire.

I'm reading ~3.5V(released) to ~3.7V(pressed) on one potentiometer and ~0.7V(released) to ~1.1V(pressed) on other which seems kinda not good to me so if someone knows the correct values i would be very grateful.

Alex.

 

T

td4van

Well-Known Member

• Sep 20, 2014

• #2

Hi these are the values I get on my car:

One is 0.72v at idle and goes up to 4.09v

Other is 0.36v at idle and goes up to 2.05v

Ecu uses it as a comparator to ensure both tracks are working.

Looks as if you have a wiring fault, faulty pedal or faulty ecu

 

AlexTD4

Member

• Sep 20, 2014

• #3

Thanks for your reply.

The voltage coming to the pedal is correct, 5V to each potentiometer, so i guess the wires and ECU are fine, most probable cause seems to be the pedal sensor itself.

 

T

td4van

Well-Known Member

• Sep 20, 2014

• #4

I didn't want to say pedal was faulty without knowing what other checks had been done first!

If 5v supply is ok and the one reading isn't changing then yes I agree you have a pedal fault.

 

AlexTD4

Member

• Sep 20, 2014

• #5

Yes sorry, forgot to mention the supply voltage was fine.

It's quite a long story actually, my throttle just died all of the sudden.

I did check everything as described in autodata software and all of the resistances were fine (measured on the sensor as well on ECU plug), supply voltage was also fine.

So after everything checked out ok, i supposed the ECU was gone. Went ahead and got a new ECU, and after changing it the problem persisted. Never crossed my mind to check the actual signal value the pedal was sending, i assumed since the resistances were fine and the voltage is getting to it the signal should be fine as well.

At least i got a spare ECU now

EDIT:

Just came back from fiddling with the pedal, it seems it is rather hard to remove the potentiometer? Is there a DIY trick on how to do it easily or the whole dash needs to be removed?

 

Last edited: Sep 20, 2014

T

td4van

Well-Known Member

• Sep 20, 2014

• #6

You remove the whole pedal assembly - 2 nuts onto some studs and then move the complete pedal and then unplug the harness and then you can take the sensor off the pedal assembly

 

AlexTD4

Member

• Sep 20, 2014

• #7

I couldn't thank you enough for your help, i will get on it tomorrow and hope without too much trouble

 

T

td4van

Well-Known Member

• Sep 20, 2014

• #8

Any more help needed just give me nudge and I'll do my best to assist!

 

AlexTD4

Member

• Sep 21, 2014

• #9

Success!

It was a pedal sensor fault after all. Was a bit tricky to remove as well, the second 13mm bolt was hidden pretty well, required some acrobatics to get to

Thanks again td4van, helped me a lot!