Checklist z27ag-captures v2: jack-stands section (23-26), conditions from the first run

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DDwfd6Ki8UfG4hK6W5YpJz

checklists/z27ag-captures.json

@@ -1,69 +1,121 @@
 {
   "id": "z27ag-captures",
-  "version": 1,
+  "version": 2,
   "title": "Z27AG decoding captures",
   "about": "docs/impl/plans/Z27AG-CAPTURES.md",
   "mark_format": "<step> <action>[ #<n>] start|end for a span, <step> <action>[ #<n>] for a point",
   "sections": [
     {
-      "title": "Parked, ignition on, engine off",
+      "title": "Parked, ignition on, engine off, handbrake on",
       "steps": [
         {
           "id": "1",
           "title": "Baseline",
           "do": "Touch nothing.",
           "finds": "the resting value of everything",
-          "actions": [{ "label": "baseline", "hold_s": 20 }]
+          "actions": [
+            {
+              "label": "baseline",
+              "hold_s": 20
+            }
+          ]
         },
         {
           "id": "2",
           "title": "Accelerator",
           "do": "Slowly to the floor over 5 s, hold 3 s, slowly back. Start as the foot moves, end when it is off.",
           "finds": "pedal position, with no rpm to confuse it",
-          "actions": [{ "label": "accel" }]
+          "actions": [
+            {
+              "label": "accel"
+            }
+          ]
         },
         {
           "id": "3",
           "title": "Brake",
           "do": "Start as you press, hold 3 s, end as you release.",
-          "finds": "brake switch, maybe pressure",
+          "finds": "brake switch, maybe pressure (engine off: the pedal goes hard after a press or two, so pressure fades over the repeats)",
-          "actions": [{ "label": "brake", "hold_s": 3, "repeat": 3 }]
+          "actions": [
+            {
+              "label": "brake",
+              "hold_s": 3,
+              "repeat": 3
+            }
+          ]
         },
         {
           "id": "4",
           "title": "Clutch",
           "do": "Start as you press, hold 3 s, end as you release.",
           "finds": "clutch switch",
-          "actions": [{ "label": "clutch", "hold_s": 3, "repeat": 3 }]
+          "actions": [
+            {
+              "label": "clutch",
+              "hold_s": 3,
+              "repeat": 3
+            }
+          ]
         },
         {
           "id": "5",
           "title": "Steering",
-          "do": "Centre, full left, full right, back to centre, slowly.",
+          "do": "Centre, full left, full right, back to centre, slowly. Engine off is cleaner but heavy without power steering: step 23 on the jack stands does it properly.",
           "finds": "steering angle",
-          "actions": [{ "label": "steer" }]
+          "actions": [
+            {
+              "label": "steer"
+            }
+          ]
         },
         {
           "id": "6",
           "title": "Gears",
-          "do": "Start when the gear is in, end as you take it out. Clutch down throughout.",
+          "do": "Engine off, clutch down throughout. Start when the gear is in, end as you take it out.",
           "finds": "reverse (likely as the reverse light); no other gearbox signal expected",
           "actions": [
-            { "label": "gear 1", "hold_s": 3 },
+            {
-            { "label": "gear 2", "hold_s": 3 },
+              "label": "gear 1",
-            { "label": "gear 3", "hold_s": 3 },
+              "hold_s": 3
-            { "label": "gear 4", "hold_s": 3 },
+            },
-            { "label": "gear 5", "hold_s": 3 },
+            {
-            { "label": "gear R", "hold_s": 3 },
+              "label": "gear 2",
-            { "label": "neutral", "hold_s": 3 }
+              "hold_s": 3
+            },
+            {
+              "label": "gear 3",
+              "hold_s": 3
+            },
+            {
+              "label": "gear 4",
+              "hold_s": 3
+            },
+            {
+              "label": "gear 5",
+              "hold_s": 3
+            },
+            {
+              "label": "gear R",
+              "hold_s": 3
+            },
+            {
+              "label": "neutral",
+              "hold_s": 3
+            }
           ]
         },
         {
           "id": "7",
           "title": "Handbrake",
-          "do": "Start as you pull it up, end as you release it.",
+          "do": "Hold the foot brake. Start as you release the handbrake, end as you pull it back up.",
           "finds": "handbrake switch",
-          "actions": [{ "label": "handbrake", "hold_s": 3, "repeat": 2 }]
+          "actions": [
+            {
+              "label": "handbrake",
+              "hold_s": 3,
+              "repeat": 2
+            }
+          ]
         },
         {
           "id": "8",
@@ -71,9 +123,18 @@
           "do": "Start when switched on, end when off.",
           "finds": "indicator states",
           "actions": [
-            { "label": "left", "hold_s": 5 },
+            {
-            { "label": "right", "hold_s": 5 },
+              "label": "left",
-            { "label": "hazard", "hold_s": 5 }
+              "hold_s": 5
+            },
+            {
+              "label": "right",
+              "hold_s": 5
+            },
+            {
+              "label": "hazard",
+              "hold_s": 5
+            }
           ]
         },
         {
@@ -82,12 +143,30 @@
           "do": "Start when switched on, end when off.",
           "finds": "light states",
           "actions": [
-            { "label": "side lights", "hold_s": 3 },
+            {
-            { "label": "dipped", "hold_s": 3 },
+              "label": "side lights",
-            { "label": "main beam", "hold_s": 3 },
+              "hold_s": 3
-            { "label": "flash", "point": true },
+            },
-            { "label": "front fogs", "hold_s": 3 },
+            {
-            { "label": "rear fog", "hold_s": 3 }
+              "label": "dipped",
+              "hold_s": 3
+            },
+            {
+              "label": "main beam",
+              "hold_s": 3
+            },
+            {
+              "label": "flash",
+              "point": true
+            },
+            {
+              "label": "front fogs",
+              "hold_s": 3
+            },
+            {
+              "label": "rear fog",
+              "hold_s": 3
+            }
           ]
         },
         {
@@ -96,12 +175,24 @@
           "do": "Start as it opens, end when it is shut. Skip what the car does not have.",
           "finds": "door switches",
           "actions": [
-            { "label": "driver door" },
+            {
-            { "label": "passenger door" },
+              "label": "driver door"
-            { "label": "rear left door" },
+            },
-            { "label": "rear right door" },
+            {
-            { "label": "boot" },
+              "label": "passenger door"
-            { "label": "bonnet" }
+            },
+            {
+              "label": "rear left door"
+            },
+            {
+              "label": "rear right door"
+            },
+            {
+              "label": "boot"
+            },
+            {
+              "label": "bonnet"
+            }
           ]
         },
         {
@@ -110,10 +201,21 @@
           "do": "Start when switched on, end when off.",
           "finds": "wiper states",
           "actions": [
-            { "label": "wipers int", "hold_s": 5 },
+            {
-            { "label": "wipers low", "hold_s": 5 },
+              "label": "wipers int",
-            { "label": "wipers high", "hold_s": 5 },
+              "hold_s": 5
-            { "label": "washer" }
+            },
+            {
+              "label": "wipers low",
+              "hold_s": 5
+            },
+            {
+              "label": "wipers high",
+              "hold_s": 5
+            },
+            {
+              "label": "washer"
+            }
           ]
         },
         {
@@ -122,8 +224,13 @@
           "do": "A/C: start on, end off. Blower: start as you turn it up, end when it is back down.",
           "finds": "A/C request, blower",
           "actions": [
-            { "label": "ac", "hold_s": 5 },
+            {
-            { "label": "blower" }
+              "label": "ac",
+              "hold_s": 5
+            },
+            {
+              "label": "blower"
+            }
           ]
         },
         {
@@ -131,7 +238,12 @@
           "title": "Seatbelt",
           "do": "Start as it clicks in, end as it comes out.",
           "finds": "belt switch",
-          "actions": [{ "label": "belt", "hold_s": 3 }]
+          "actions": [
+            {
+              "label": "belt",
+              "hold_s": 3
+            }
+          ]
         }
       ]
     },
@@ -144,19 +256,34 @@
           "do": "Cold start if possible: mark as the starter turns, then idle 60 s.",
           "finds": "starting, coolant and oil warming, idle control",
           "actions": [
-            { "label": "engine start", "point": true },
+            {
-            { "label": "idle", "hold_s": 60 }
+              "label": "engine start",
+              "point": true
+            },
+            {
+              "label": "idle",
+              "hold_s": 60
+            }
           ]
         },
         {
           "id": "15",
           "title": "Revs",
-          "do": "Start when the revs are steady at the target, end as you leave it.",
+          "do": "Neutral, clutch up. Start when the revs are steady at the target, end as you leave it.",
           "finds": "engine speed against OBD rpm, throttle against pedal",
           "actions": [
-            { "label": "rpm 1500", "hold_s": 5 },
+            {
-            { "label": "rpm 2000", "hold_s": 5 },
+              "label": "rpm 1500",
-            { "label": "rpm 3000", "hold_s": 5 }
+              "hold_s": 5
+            },
+            {
+              "label": "rpm 2000",
+              "hold_s": 5
+            },
+            {
+              "label": "rpm 3000",
+              "hold_s": 5
+            }
           ]
         },
         {
@@ -164,21 +291,35 @@
           "title": "Blips",
           "do": "Three sharp blips of the throttle.",
           "finds": "response timing of throttle, rpm, pressure",
-          "actions": [{ "label": "blips" }]
+          "actions": [
+            {
+              "label": "blips"
+            }
+          ]
         },
         {
           "id": "17",
           "title": "A/C under load",
           "do": "A/C on for 20 s, then off.",
           "finds": "compressor clutch, idle-up",
-          "actions": [{ "label": "ac", "hold_s": 20 }]
+          "actions": [
+            {
+              "label": "ac",
+              "hold_s": 20
+            }
+          ]
         },
         {
           "id": "18",
           "title": "Radiator fan",
           "do": "Idle until the fan cuts in, if it will; mark when you hear it.",
           "finds": "fan state, coolant threshold",
-          "actions": [{ "label": "fan", "point": true }]
+          "actions": [
+            {
+              "label": "fan",
+              "point": true
+            }
+          ]
         }
       ]
     },
@@ -188,12 +329,21 @@
         {
           "id": "19",
           "title": "Steady speeds",
-          "do": "Where safe, hold each speed 10 s.",
+          "do": "Where safe, hold each speed 10 s. Or do step 24 on the jack stands instead.",
           "finds": "road and wheel speeds against OBD and GNSS speed",
           "actions": [
-            { "label": "steady 20", "hold_s": 10 },
+            {
-            { "label": "steady 40", "hold_s": 10 },
+              "label": "steady 20",
-            { "label": "steady 60", "hold_s": 10 }
+              "hold_s": 10
+            },
+            {
+              "label": "steady 40",
+              "hold_s": 10
+            },
+            {
+              "label": "steady 60",
+              "hold_s": 10
+            }
           ]
         },
         {
@@ -202,8 +352,12 @@
           "do": "Start as you brake, end when stopped.",
           "finds": "brake pressure, deceleration",
           "actions": [
-            { "label": "gentle stop" },
+            {
-            { "label": "firm stop" }
+              "label": "gentle stop"
+            },
+            {
+              "label": "firm stop"
+            }
           ]
         },
         {
@@ -211,14 +365,86 @@
           "title": "Corners",
           "do": "A few corners each way.",
           "finds": "yaw, lateral g, wheel speed differences",
-          "actions": [{ "label": "corners" }]
+          "actions": [
+            {
+              "label": "corners"
+            }
+          ]
         },
         {
           "id": "22",
           "title": "Through the box",
           "do": "Each gear in turn.",
           "finds": "gear from rpm / speed",
-          "actions": [{ "label": "gears" }]
+          "actions": [
+            {
+              "label": "gears"
+            }
+          ]
+        }
+      ]
+    },
+    {
+      "title": "On jack stands (front wheels up, rears chocked, handbrake off)",
+      "steps": [
+        {
+          "id": "23",
+          "title": "Steering, unpowered",
+          "do": "Engine off, wheels in the air. Centre, full left, full right, back to centre, slowly.",
+          "finds": "steering angle with nothing else moving",
+          "actions": [
+            {
+              "label": "steer"
+            }
+          ]
+        },
+        {
+          "id": "24",
+          "title": "Wheel speeds",
+          "do": "Engine running. Hold each speedometer reading 10 s; start when it is steady, end as you leave it.",
+          "finds": "vehicle and wheel speeds (fronts turning, rears still), speedometer against CAN, rpm against gear. The ABS light may come on; that is a find too.",
+          "actions": [
+            {
+              "label": "2nd 20",
+              "hold_s": 10
+            },
+            {
+              "label": "2nd 40",
+              "hold_s": 10
+            },
+            {
+              "label": "3rd 40",
+              "hold_s": 10
+            },
+            {
+              "label": "3rd 60",
+              "hold_s": 10
+            }
+          ]
+        },
+        {
+          "id": "25",
+          "title": "Brake from speed",
+          "do": "3rd at 40 on the speedometer, clutch down, brake to a stop. Start as you brake, end when the wheels stop.",
+          "finds": "brake with the engine running (vacuum assist), wheel deceleration",
+          "actions": [
+            {
+              "label": "brake from 40",
+              "repeat": 2
+            }
+          ]
+        },
+        {
+          "id": "26",
+          "title": "Reverse",
+          "do": "Reverse gear, wheels turning gently, 10 s.",
+          "finds": "reverse light, wheel direction (if the speeds are signed)",
+          "actions": [
+            {
+              "label": "reverse",
+              "hold_s": 10
+            }
+          ]
         }
       ]
     }

docs/impl/plans/Z27AG-CAPTURES.md

@@ -42,17 +42,26 @@ They are data: [`checklists/z27ag-captures.json`](../../../checklists/z27ag-capt
 bundled into the app as an exact copy (app-flutter `tool/sync-contracts.sh`;
 crosscheck fails if the copy drifts). Edit them there; bump `version` when steps
 change meaning, since every recording names the version it was made with. Before
-starting: PEAK on the OBD port, Orin up, tablet connected; engine off, doors shut.
+starting: PEAK on the OBD port, Orin up, tablet connected, and `can_pcan` UP (the
+recorder refuses marks with "no session" otherwise); engine off, doors shut.
 
-- **Parked, ignition on, engine off** (1–13): baseline, pedals, steering, gears
+- **Parked, ignition on, engine off, handbrake on** (1–13): baseline, pedals, steering, gears
   (reverse likely shows as the reverse light: the diesel forfour carries it in
   `423` byte 1 bit 3; no other gearbox signal expected), handbrake, indicators,
   lights, doors, wipers, A/C, belt.
-- **Engine running, parked** (14–18): start and idle, held revs (OBD rpm is the
+- **Engine running, parked** (14–18): start and idle, held revs in neutral (no OBD
-  reference), blips, A/C load, radiator fan.
+  on this car's CAN: the revs are approximate, read off the tacho), blips, A/C load, radiator fan.
 - **Driving** (19–22): steady speeds, stops, corners, each gear. A passenger presses,
-  or skip the marks: OBD and GNSS speed are recorded continuously, and gear comes
+  or skip the marks: GNSS speed is recorded continuously, and gear comes from
-  from rpm ÷ speed.
+  rpm ÷ speed.
+- **On jack stands** (23–26, since v2): front wheels up, rears chocked, handbrake
+  off. Unpowered steering; speedometer readings held in 2nd and 3rd (fronts turn,
+  rears stay still, which tells the wheels apart); braking from speed with vacuum
+  assist; reverse. Stands replace the driving speeds where a drive is not practical.
+
+Version 2 (2026-10-13) adds the stands section and writes down the conditions the
+first run showed matter: engine off and handbrake on for 1–13, foot brake held for
+the handbrake step, neutral with the clutch up for the revs.
 
 The parked steps can be split over several sessions; the drive is the important part.