GrandMarquis97 RevA

Grand Marquis 1997 MS3 replacement PCB — R10 eight-layer candidate

Engineering checkpoint — not released for fabrication or vehicle use.

This repository contains the active R10 eight-layer KiCad candidate for a custom controller in a 1997 Mercury Grand Marquis EEC-V enclosure. The design is still ROUTING_INCOMPLETE.

Current verified inventory

The read-only static audit of the native board reports:

• 246 footprints and 888 pads;
• 737 assigned pad/net pairs matching source/input_netlist.xml, excluding the intentionally off-board J121 entry;
• eight copper layers (F.Cu, In1.Cu–In6.Cu, B.Cu);
• 43,176 segments and 2,230 through vias;
• 102 zero-length segments;
• 207 exact duplicate segment geometries, comprising 208 extra records;
• 3,339 locked segments and 89 locked vias.

Run py source/production_baseline_audit.py to regenerate production_review/BASELINE_AUDIT.md and the machine-readable audit. This parser is a reproducible inventory tool; it does not replace KiCad DRC, ERC, zone refill, or visual review.

Stale validation warning

reports/Routing_validation.json is behind the current board by 280 segments and four vias. reports/After_routing_DRC.txt is also a saved checkpoint, not a current native run. Its 24 unconnected-item findings and other category counts must be regenerated before routing work begins.

Release blockers

• Native DRC and ERC must be rerun on the current files.
• Every true open, unintended dangling object, zero-length segment, duplicate segment, and unexplained zone island must be resolved without weakening rules.
• The 0.20 mm Default class conflicts with the 0.25 mm signal target in REQUIREMENTS_CURRENT.md.
• The eight-layer physical stackup and copper weights are not selected.
• Footprints, procurement BOM, functional pin mapping, current paths, via arrays, thermal interfaces, mechanical fit, and automotive protection remain incompletely qualified.
• Bench, transient, engine, and transmission validation have not been performed.

See production_review/RELEASE_STATUS.md and production_review/KNOWN_HOLDS.md for the controlling release posture.

Primary files

• GrandMarquis97_RevA.kicad_pro, .kicad_sch, and .kicad_pcb: active native project.
• GM97_Layout.pretty, GM97.kicad_sym, and models: project libraries.
• REQUIREMENTS_CURRENT.md: current project requirements.
• production_review: regenerated audit evidence and release status.
• reports: current and historical engineering reports; check each report's date and provenance before relying on it.
• source: audit and historical routing scripts. Do not rerun historical routing automation wholesale against the active board.

No release Gerbers or drill package are provided.