From 5feba8b354244d14756aa6e62a510d978e10b0ed Mon Sep 17 00:00:00 2001 From: Mikkeli Date: Tue, 13 Oct 2026 21:48:07 +0900 Subject: [PATCH] Decode report: clutch and transmission not on CAN, stated once; no camera trigger plan Co-Authored-By: Claude Opus 5.5 Claude-Session: https://claude.ai/code/session_01DDwfd6Ki8UfG4hK6W5YpJz --- docs/impl/reports/Z27AG-DECODE-1.md | 20 +++++++++----------- 1 file changed, 9 insertions(+), 11 deletions(-) diff --git a/docs/impl/reports/Z27AG-DECODE-1.md b/docs/impl/reports/Z27AG-DECODE-1.md index f6e993f..c7e1bac 100644 --- a/docs/impl/reports/Z27AG-DECODE-1.md +++ b/docs/impl/reports/Z27AG-DECODE-1.md @@ -46,17 +46,15 @@ jack-stands session and a GNSS-matched drive settle both the byte order and the ## Not on this bus (or not seen) -- **Clutch pedal:** nothing changed in 3 presses, engine off. -- **Gear position:** nothing in 5 gears, reverse or neutral. Expected for a manual: - nothing on the car consumes it. Not computed from rpm ÷ wheel speed either (owner's - call, 2026-10-13): the clutch is invisible, so the ratio lies whenever it slips or is - down, and the gear matters most at a standstill (no 3rd-gear launch), where the ratio - says nothing. A *recommended* gear from speed and rpm is the useful form, if any. -- **Reverse:** rechecked against both reverse stretches (engine-off gear walk, engine-on - back crawl) versus every other gear, neutral, the forward crawl and idle: no bit - separates them (the one near-miss, `449.0.0`, is the low bit of a temperature). The - reverse lamp is wired, not on this bus; a backup camera would take its trigger from - the lamp circuit. The jack-stands run's reverse step is one more sample. +- **Clutch and transmission are not on this bus.** Nothing changed for the clutch + (3 presses), any of the 5 gears, neutral or reverse: nothing on the car consumes + them, so no frame carries them. Reverse was rechecked against both reverse + stretches (engine off and engine on) versus every other position: no bit + separates them. +- **Gear is not inferred from rpm ÷ wheel speed** (owner's call, 2026-10-13): the + clutch is invisible, so the ratio lies whenever it is down or slipping, and the + gear matters most at a standstill, where the ratio says nothing. A *recommended* + gear from speed and rpm is the useful form, if any. - **Steering angle:** not analysed yet (step 5 was done with the engine on, at the end). ## Not analysed yet