K Line

cheezemonkhai · 09-03-2007, 16:11

Not sure if this is in the right place but ...

Can anyone explain to me how the K-Line works between the ECU and sensors?

Is it just a case of fluctuating the voltage according to values, or is it encoded data?

If it is just fluctuating voltage is it a single wire pulsing solution of a pair etc etc?

Many thanks

Chris_55 · 09-03-2007, 22:10

'k' line does not work between the ECU and sensors, it is (for VAG) purely a single wire line for serial communication between the various ECU's and a diagnostic scan tool.

cheezemonkhai · 11-03-2007, 03:57

The diagram I have gives the impression it was a k-line going between a sensor and the ECU.

Can I take it that the K line is a serially encoded data format then, and that I would need to know the message formats, and data encoding (eg 10/8) to write to it.

If it isn't a K line going to the sensor, what would it be just a simple voltage feedback?

Chris_55 · 11-03-2007, 19:01

Quote:

Originally Posted by cheezemonkhai

The diagram I have gives the impression it was a k-line going between a sensor and the ECU.

Can I take it that the K line is a serially encoded data format then, and that I would need to know the message formats, and data encoding (eg 10/8) to write to it.?

Yes

Quote:

Originally Posted by cheezemonkhai

If it isn't a K line going to the sensor, what would it be just a simple voltage feedback?

It may be, but other formats like PCM or variable freqency are used it depends which sensor you mean.

cheezemonkhai · 12-03-2007, 00:31

DPF pressure sensor (G450 on the superb)

This is the start of a long line of working things out

09-03-2007, 16:11	#1
cheezemonkhai Briskodian Join Date: Jan 2006 Posts: 15,865 Members Car: Thanks: 139 Thanked 549 Times in 502 Posts	K Line Not sure if this is in the right place but ... Can anyone explain to me how the K-Line works between the ECU and sensors? Is it just a case of fluctuating the voltage according to values, or is it encoded data? If it is just fluctuating voltage is it a single wire pulsing solution of a pair etc etc? Many thanks __________________ Cars make CO2 and trees absorb CO2. By driving your car you're feeding a tree and helping the environment.

09-03-2007, 22:10	#2
Chris_55 Briskodian Join Date: Oct 2005 Location: KENT UK Posts: 99 Members Car: Thanks: 1 Thanked 12 Times in 12 Posts	Re: K Line 'k' line does not work between the ECU and sensors, it is (for VAG) purely a single wire line for serial communication between the various ECU's and a diagnostic scan tool.

11-03-2007, 03:57	#3
cheezemonkhai Briskodian Join Date: Jan 2006 Posts: 15,865 Members Car: Thanks: 139 Thanked 549 Times in 502 Posts	Re: K Line The diagram I have gives the impression it was a k-line going between a sensor and the ECU. Can I take it that the K line is a serially encoded data format then, and that I would need to know the message formats, and data encoding (eg 10/8) to write to it. If it isn't a K line going to the sensor, what would it be just a simple voltage feedback? __________________ Cars make CO2 and trees absorb CO2. By driving your car you're feeding a tree and helping the environment.

12-03-2007, 00:31	#5
cheezemonkhai Briskodian Join Date: Jan 2006 Posts: 15,865 Members Car: Thanks: 139 Thanked 549 Times in 502 Posts	Re: K Line DPF pressure sensor (G450 on the superb) This is the start of a long line of working things out __________________ Cars make CO2 and trees absorb CO2. By driving your car you're feeding a tree and helping the environment.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode