Dev Blog
Forum
Wiki
About
NefMoto
>
Noob Zone
>
Noob Questions
(Moderator:
turboat
) >
Knock sensor logging, multiple voltages?
Pages: [
1
]
« previous
next »
Author
Topic: Knock sensor logging, multiple voltages? (Read 1780 times)
TeknoFi
Full Member
Karma: +1/-3
Offline
Posts: 87
Knock sensor logging, multiple voltages?
« on: July 31, 2022, 01:00:51 PM »
Hello,
i have a 1.8t ajq (audi tt) with two sensors. why do I get four different voltages and how should they be interpreted?
each sensor gives one wire to the ecu, so where are the extra voltages coming to the logs?
According the logs, cylinders 1+3 and 2+4 give voltage close to each other, and between groups are bigger voltage cap. If the pairs were 1+2 and 3+4, I would melt it into the difference between the sensors, but this is too weird for me. Could someone please explain please.
Logged
fknbrkn
Hero Member
Karma: +214/-24
Offline
Posts: 1520
mk4 1.8T AUM
Re: Knock sensor logging, multiple voltages?
« Reply #1 on: July 31, 2022, 02:23:37 PM »
Ecu obviously knows when eqch cylinder are firing, no matter how much sensors it has
In case of two sensors first logs 1-2 and the second 3-4 cyl. Just for accuracy
In general you dont need all of this voltages except to diagnose dead sensor/wiring
Logged
nyet
Administrator
Hero Member
Karma: +609/-169
Offline
Posts: 12299
Re: Knock sensor logging, multiple voltages?
« Reply #2 on: August 01, 2022, 05:02:53 PM »
voltages mean literally nothing. They are heavily processed by the ECU.
Logged
ME7.1 tuning guide
ECUx Plot
ME7Sum checksum
Trim heatmap tool
Please do not ask me for tunes. I'm here to help people make their own.
Do not PM me technical questions! Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your ex
Pages: [
1
]
Print
« previous
next »
Jump to:
Please select a destination:
-----------------------------
General
-----------------------------
=> Introductions
=> General Discussion
-----------------------------
Noob Zone
-----------------------------
=> Noob Questions
=> Noob Guides and FAQs
-----------------------------
Technical
-----------------------------
=> NefMoto Software
=> Tuning
===> Documents & Helpers & How To's
===> Community Projects
=> Diagnostics
=> Flashing and Chipping
=> Cluster and Immobilizer
===> ECU EEPROM images
===> Original Cluster dumps
===> Original Cluster dump requests
=> Data Logging
=> Reverse Engineering
=> Communication Protocols
-----------------------------
ECU Files
-----------------------------
=> ECU Definition Files
===> ECU Definition File Requests
=> Original ECU Files
===> Original ECU File Requests
=> Checksum Update Requests
-----------------------------
Vehicles
-----------------------------
=> Vehicle Tech
=> Project Cars
-----------------------------
Regional
-----------------------------
=> Canadian Regional Discussion
=> US Regional Discussion
-----------------------------
Classifieds
-----------------------------
=> For Sale
=> Wanted
=> Services
-----------------------------
Miscellaneous
-----------------------------
=> Off Topic
=> Forum Tech Support
=> Bizarro Messages Posted by Bots and Spammers
Navigation
Home
Help
Login
Register
Personal Tools
June 12, 2025, 08:55:57 AM
Welcome,
Guest
. Please
login
or
register
.
Did you miss your
activation email?
1 Hour
1 Day
1 Week
1 Month
Forever
Login with username, password and session length
Search
Advanced Search
Loading...