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YOUR RESEARCHP0343 code - is it the DME? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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Check voltage
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Performed · outcome unconfirmed · Original poster
With the harness disconnected from the DME, I checked for voltage on the DME output pin (on the DME itself).
P0343 code - is it the DME? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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Leading evidence: 'Check voltage' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check voltage' (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.
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 performed work without a confirmed outcome
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0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Performed · outcome unconfirmed · Original poster
With the harness disconnected from the DME, I checked for voltage on the DME output pin (on the DME itself).
P0343 code - is it the DME? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Disconnect harness at the dme showed no continuity
Performed · outcome unconfirmed
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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 performed work without a confirmed outcome
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Performed · outcome unconfirmed · Original poster
Testing the wiring from the camshaft sensor connector to the other end of the disconnected harness at the DME showed no continuity.
P0343 code - is it the DME? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Replace shorted wire and see if it works
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Suggestion · Original poster
I suppose the next step is to replace the shorted wire and see if it works.
P0343 code - is it the DME? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Test indicates a short in the wiring
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Suggestion · Original poster
Now I am confused because the wiring test indicates a short in the wiring but I read contradictory information whether it may be normal to find 12V at pin 20 on certain Boxsters or that the DME could have developed an internal fault.
P0343 code - is it the DME? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Test indicates a short in the wiring
No successful repair reported for this finding.
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Reported fixes
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Unsuccessful attempts
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Read evidence and context
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Suggestion · Original poster
Now I am confused because the wiring test indicates a short in the wiring but I read contradictory information whether it may be normal to find 12V at pin 20 on certain Boxsters or that the DME could have developed an internal fault.
P0343 code - is it the DME? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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Generation: 20261026T191851Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hi all,
It has been a while since I had a problem that was puzzling. My 2001 Boxster S suddenly developed a misfire and flashing CEL. I read the codes and found it is a P0343 code, indicating a probable wiring fault. I followed the recommended testing procedure and found 12V at the connector with ignition on but engine not running. Testing the wiring from the camshaft sensor connector to the other end of the disconnected harness at the DME showed no continuity. So far the testing indicates it's a short in the wiring that I need to correct.
Here's where it becomes somewhat less clear to me. With the harness disconnected from the DME, I checked for voltage on the DME output pin (on the DME itself). With the ignition on, there was 12V on pin 20. There was no voltage at pin 19 (camshaft position sensor 2).
Now I am confused because the wiring test indicates a short in the wiring but I read contradictory information whether it may be normal to find 12V at pin 20 on certain Boxsters or that the DME could have developed an internal fault.
The car has been owned by my brother or me since 2005. I know the wiring has never been hacked nor are there any add-ons to the car. I replaced the coolant reservoir and oil filler tube (on the engine) a week before the camshaft sensor fault appeared and moved the wiring harness out of the way while doing that job. So that makes it quite possible that a wire broke or chafed during that job.
I suppose the next step is to replace the shorted wire and see if it works. If anyone has experience with the issue, especially whether there may be 12V at pin 20 on the DME, I would appreciate the input. Apologies for the length, but I wanted to present as much relevant information as I can.
Thanks, Greg
P0343
CPS on bank 1, bank 1 is on the right side of the car. You need to measure on PIN C/12 which is on the third plug from top of the DME, see manual. If you look closely on the pugs they are numbered.
