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Communication k line voltage in Porsche 996 turbo, 2001

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YOUR RESEARCHCommunication k line voltage in Porsche 996 turbo, 2001

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Test other pins as needed

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Suggestion
I think you could test other pins as needed.
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Communication k line voltage in Porsche 996 turbo, 2001

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Leading evidence: 'Test other pins as needed' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Test other pins as needed' (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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Use unprotected transistor

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Suggestion
When the scanner wants to send a bit "0", it pulls the K-line to ground using an unprotected transistor.
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Communication k line voltage in Porsche 996 turbo, 2001

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Test other pins as needed

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Unsuccessful attempts: 1
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Suggestion
I think you could test other pins as needed.
Original post Read captured discussion
Communication k line voltage in Porsche 996 turbo, 2001

Use unprotected transistor

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.

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Suggestion
When the scanner wants to send a bit "0", it pulls the K-line to ground using an unprotected transistor.
Original post Read captured discussion
Communication k line voltage in Porsche 996 turbo, 2001

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POST 1 / ORIGINAL POSTEROriginal post

Hi guys, I need some help regarding the k line voltage in k lines in Porsche 996,2001. I hope people in this group know it. My voltages are as , With ignition off Pin 7 - 6.4 V , Pin 3- 1.22 voltage ignition onPin 7- 8.13v, pin 3- 11.05v Can someone confirm please. I am chasing some no crank issue in a 996 . Thankyou

POST 2Original post

The airbag is on the second K-line, which is connected to pin 3 of the OBDII port. K-line idles high (bit "1"). When the scanner wants to send a bit "0", it pulls the K-line to ground using an unprotected transistor. If the K-line is shorted to +12v, that will kill the transistor when the scanner tries to pull that 12v to ground. To test if pin 3 is shorted to the +12v, connect a ~500ohm resistor between pin 3 and +12v, then another 50ohm (5w or hgher) resistor between pin 3 and the ground. Now measure pin 3. If it only has ~1v, your K-line is fine. If it's still at 12v, the K-line is shorted to 12v. Be careful the 50ohm resistor will get hot if the K-lime is shorted to 12v I am no expert, but here is a simple test you can run. Mostly for K2 line which doesn�t involve your engine or tranny. There is a pin out for OBD2. I think you could test other pins as needed.

POST 3Original post

Quotes source post: 18691047

@jumpy chunky are you sure you're no expert? Give Credit where credit is due. Your efforts to help other 996 owners here makes you one of a relatively small group of 996 owners. Thanks 🙏👍

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