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Pelican Parts

OBDII tach signal

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2 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
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YOUR RESEARCHOBDII tach signal

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Suggestion · Original poster

Does anyone know when this change happened?

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OBDII tach signal
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Leading evidence: 'Replace happened' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace happened' (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.

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Replace happened

No successful repair reported for this finding.

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

Does anyone know when this change happened?

Original post Read captured discussion
OBDII tach 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.

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

  • Pelican Parts: 1 discussions

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Generation: 20261026T083035Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Early OBDII ports, like the OBDI ports before them, have a 12V square wave tach signal on pin 9. However, my 07 Turbo does not. So at some point Porsche changed what it put on its OBDII port. Does anyone know when this change happened? More broadly, when it happened for Boxsters and Caymans?

POST 2Original post

Walt I believe that when Porsche switched to Can Diagnostic Protocol from K-line the Pin 9 tach lead was dropped. So all 996's and 986 Boxsters have the pin 9 Tach lead. MK-1 987 Boxsters ,Cayman's and MK-1 997's should also have the pin 9 tach lead because the switch to can protocol was made on the MK-2's. If you need this information for a scrutinering issue, I will look further to verify the info on the MK-1 987 Boxsters ,Caymans and 997's . To add all 997 GT2's are Can based

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