Speedometer pick up/sensor? Where?
Thread Starter
Super Moderator
Joined: Jun 2008
Posts: 19,942
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From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
Speedometer pick up/sensor? Where?
I have STFF and realise that people don't understand the rolling circumference of tyres but can't find what I want.
Where does the speedometer pick up it's voltage data from? Rear wheels? front wheels? ABS sensors? a transmission sensor somewhere?
Your help would be much appreciated
Where does the speedometer pick up it's voltage data from? Rear wheels? front wheels? ABS sensors? a transmission sensor somewhere?
Your help would be much appreciated
MBWorld Fanatic!
Joined: Jul 2004
Posts: 1,194
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From: Diamond Bar & Anaheim, CA
2003 C-Class Sportcoupe
It picks up the data from the 4 wheel speed sensors, which are on the metal ends of the side axles. You can datalog the values by hooking them up to SDS. TCU gets the data from the wheel speed sensors and transmission output speed sensors. If there is a discrepancy between the wheel speed and the transmission output speed by more then a certain low % value, then the TCU will throw a code and put you into limp mode. You can adjust for changes in tire size diameter by setting the correct tire sizes in SDS.
Thread Starter
Super Moderator
Joined: Jun 2008
Posts: 19,942
Likes: 192
From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
It picks up the data from the 4 wheel speed sensors, which are on the metal ends of the side axles. You can datalog the values by hooking them up to SDS. TCU gets the data from the wheel speed sensors and transmission output speed sensors. If there is a discrepancy between the wheel speed and the transmission output speed by more then a certain low % value, then the TCU will throw a code and put you into limp mode. You can adjust for changes in tire size diameter by setting the correct tire sizes in SDS.
The reason I was asking was in relation to rolling circumference of tyres. So the Star (SDS) can adjust for roll. circ. changes. Thank you - you have answered all my questions
Thread Starter
Super Moderator
Joined: Jun 2008
Posts: 19,942
Likes: 192
From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
