5 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHBest Practice for Making CAN Connection?
Leading reported evidence
Run way back
Suggestion or failed attempt
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0
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1
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Read evidence and context
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Discussions that contain suggestions
1
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Suggestion
I'd tap into the CAN H/CAN-L at an existing connector rather than running all the way back to the DME or Tip.
Leading evidence: 'Run way back' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Run way back' (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 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.
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.
5 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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I got all set up to start capturing CAN traffic on my 2001 C4 Cab w/Tip over the ODB2 connector, but was befuddled that I didn't see any traffic. As many know, including me now, those pins aren't connected on this model and others. My Chevy Traverse was very verbose, however. That proved the equipment.
So now, I need to figure out the best place and method of inserting a 3 pin connector that I can go to in the future without having to tear stuff up every time.
There's a connector that I already have exposed that is in the driver's side, passenger area near the outside. I could also either trace those wires where they hit the dash area. Or, pull the instrument cluster. Or run wires back from the PSM. Or, tap off at the Tip or DME.
The fact that they terminate the can bus in 120 ohms is concerning, however. That is intended to help eliminate reflections of the signals on those lines. Transmission lines 101.
Hence this post: what is a tried and true method to tap in without inducing issues?
I'd tap into the CAN H/CAN-L at an existing connector rather than running all the way back to the DME or Tip. If you can get to the bus wiring near the dash, I'd think that's the cleanest option. A proper high impedance tap shouldn't affect the bus, but I'd definitely avoid adding any termination or making a long branch. A small 3 pin connector tucked away somewhere accessible would be pretty slick for future testing.
I found an "easy" place to tap in at the steering angle sensor. It has all the signals and is just a bundle of 4 wires. Being a contortionist would have been helpful, though.
Pics from the CAN work. It's up and running. I just have to figure out how to interpret the frames. The DBCs I found were 996.2 and 997. Some of it overlaps, but not all.
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