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Bosch ABS Speed Signal

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7 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHBosch ABS Speed Signal

Leading reported evidence

Disconnect wheel sensor and hook an oscilloscope

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes
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Unsuccessful attempts
1
Discussions
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Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

Discussions that contain suggestions
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion

One way to confirm would be to disconnect a wheel sensor and hook an oscilloscope to it and spin the wheel, or just rotor if the wheel is off.

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Bosch ABS Speed Signal
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Leading evidence: 'Disconnect wheel sensor and hook an oscilloscope' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Disconnect wheel sensor and hook an oscilloscope' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.

Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.

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1 matching discussions · 7 captured posts examined · 0 partial discussions

Frequently discussed actions (1)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

Disconnect wheel sensor and hook an oscilloscope

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion

One way to confirm would be to disconnect a wheel sensor and hook an oscilloscope to it and spin the wheel, or just rotor if the wheel is off.

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Bosch ABS Speed Signal
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Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.

7 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

  • Rennlist: 1 discussions

0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.

0 acknowledgements have no verified action link; they do not establish a repair result.

Generation: 20261027T140027Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

One last detail to complete my ls to 1999 996 conversion -the vehicle speed signal .What I know is that the abs control unit provides the dme with the vehicle speed signal .What I don't know is what that signal looks like .The gm ecu requires a square wave -the pulses are configurable . Does anyone know what the Bosch signal characteristics are ? Thanks Dave

POST 2Original post

If you want a guess I would say square wave given the wheel speed sensor and tension flange configuration seen here: http://www.autoatlanta.com/porsche-p...section=401-05 One way to confirm would be to disconnect a wheel sensor and hook an oscilloscope to it and spin the wheel, or just rotor if the wheel is off. You might even be able to see the pulse with a multimeter, but not sure about that since the signal would be fairly weak.

POST 4 / ORIGINAL POSTEROriginal post

DBJoe I believe you are right on the wheel sensors .I am trying to determine what the bosch abs control unit sends to the dme . ocfservice-sine wave from the control unit ?

POST 5Original post

I think he's pointing out that the wheel speed sensors produces AC current when you rotate the hub.

POST 6Original post

This thread should help. https://rennlist.com/forums/racing-a...peed-data.html

POST 7 / ORIGINAL POSTEROriginal post

Ahsai-thank you !This helps a lot .......... Slakker -good luck with your new track car .

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