Hybrid tool + report
280ZX Stator Magnet Checker: Intent Routing, Risk Boundaries, and Action Guide
Run the tool first to separate distributor-magnet replacement intent from charging-system diagnosis, then use the report layer to make a source-backed next-step decision on one URL.
Published: April 13, 2026|Evidence update: April 13, 2026 (stage1b research enhance round 2)|Review cadence: 6 months or source-change trigger
Evidence trust signals
1982 Nissan 280ZX FSM EL chapterOfficial Nissan USA parts endpointNHTSA + USTR safety-risk referencesFluke + Keysight metrology guidanceCommunity reports (context only)
Anti-duplication angle for this change
Existing `/learn/*` pages in this repository focus on EV motor design topics. This page has a distinct vintage service-intent angle for 280zx stator magnet: tool-first intent routing and subsystem-specific risk decisions for ambiguous legacy searches.
Tool layer: run the checker first
Fill the minimum measurements, then generate a deterministic verdict with uncertainty and next action.
Deterministic output for the same inputs.
Result layer: interpreted output + action
Empty state, boundary notes, and next-step guidance are shown in-place.
Run the checker to get a verdict
The first result will show risk score, confidence, summary, and a minimum next action.
Report summary: conclusions, key numbers, fit boundaries
This layer explains why the checker output is trustworthy enough for triage and where final certainty still depends on model-level documentation.
Official lifecycle signal changed the decision flow
22158-S6700 = discontinued + no fitment table
The tool now treats OEM availability as a boundary condition and forces variant checks before any order-path recommendation.
Charging anchors are condition-bound
13-15 V @1,500 rpm; >50 A @2,500 rpm
FSM-derived voltage/current limits are retained as screening gates and explicitly tied to RPM and temperature context.
Low-ohm metrology matters
0.057-ohm stator scale vs ~0.3-ohm lead error
Fluke/Keysight guidance supports REL compensation and 4-wire methods when lead resistance is close to the DUT value.
Risk is not only technical
Counterfeit consequence evidence (2023-2024)
NHTSA and USTR evidence is now linked to procurement mitigations so discontinued-part sourcing decisions include safety tradeoffs.
Core report snapshot
Mid-page executive summary for quick decision alignment.
Primary intent fit
Tool routes distributor vs charging first, then applies evidence weighting
Designed for immediate do-intent plus deeper know-intent in a single page flow.
Core numeric anchors
13-15 V @1,500 rpm, 14.4-15.0 V, >50 A @2,500 rpm, 0.057 ohm @20C
Anchors are sourced from the 1982 EL chapter and remain context-bound screening values.
Evidence mix
OEM manual + official Nissan parts + catalog mirror + instrument makers + regulators
Community sources stay supplemental and do not drive pass/fail boundaries.
Main boundary
VIN-level supersession and fitment gaps remain open
When evidence conflicts, page enforces conservative actions and marks unresolved items as pending confirmation.
Stage1b gap-audit closure (this round)
Explicit record of what was weak before, why it mattered, and how this deep-enhance round closed it.
| Gap found | Decision risk if not fixed | Round action | Status |
|---|---|---|---|
| Official OEM lifecycle evidence was under-used in core conclusions | Users could buy the wrong part family and still fail to solve no-start or no-charge symptoms. | Added Nissan USA official parts endpoint evidence for 22158-S6700 (discontinued + no fitment data) and tied it to action/risk sections. | Closed in round 2 |
| Component-boundary terms were still easy to confuse | Users could misread distributor components as alternator parts and order incompatible hardware. | Added component boundary map separating 22158-S6700 Magnet Assy, 22163-Q1700 Stator, and alternator stator windings. | Closed in round 2 |
| Turbo/non-turbo fitment boundaries were not explicit enough in the tool layer | Searchers could miss discontinued-status risk or buy incompatible replacement stock. | Added engine-variant input and route-specific boundary notes backed by 1982 parts listing differences (L28E vs L28ET distributor assemblies). | Closed in round 2 |
| Metrology and supply-chain risk evidence lacked high-authority external support | Weak sourcing can hide both low-ohm measurement error and counterfeit-part safety exposure. | Added Fluke + Keysight low-ohm method evidence and NHTSA/USTR safety-risk evidence for counterfeit replacement decisions. | Closed in round 2 |
Pending confirmation (do not overclaim)
Evidence gaps kept explicit when reliable public data is still insufficient.
| Topic | Current evidence status | Minimum next step |
|---|---|---|
| Open-public Nissan service bulletin explicitly using the phrase "stator magnet" for S130 | As of April 13, 2026, publicly indexed OEM documents describe charging-system alternator checks and distributor assemblies, but not a single unified "stator magnet" diagnostic bulletin. | Keep intent-split workflow and force manual confirmation against vehicle-specific service documentation. |
| VIN-level supersession map for 22158-S6700 in open public endpoints | Official Nissan endpoint shows discontinued status but no fitment rows, while catalog mirrors provide partial variant context rather than VIN-resolved supersession. | Treat fitment as conditional and require VIN-era + distributor ID confirmation before order approval. |
| Open-public benchmark band for alternator AC VAC under modern replacement alternators | FSM gives period-correct electrical specs, but broad public datasets for rebuilt/aftermarket 280ZX alternator AC behavior are inconsistent. | Keep AC VAC as screening only and require model-specific bench validation when readings sit near decision boundaries. |
Intent and evidence patterns (April 13, 2026)
This table documents why the page is built as a single-URL hybrid, not split pages.
| Observed pattern | Evidence | Page decision |
|---|---|---|
| Official Nissan parts endpoint shows lifecycle stop + missing fitment table | Nissan USA parts page for 22158-S6700 marks the item as discontinued and shows no vehicle-fitment rows. | Any purchase recommendation must include explicit variant verification instead of title-only ordering. |
| 1982 FSM provides condition-bound charging anchors | EL section includes 1,500-rpm B-terminal check markers (13-15 V and >15.5 V branch), 14.4-15.0 V regulated output, >50 A hot output at 2,500 rpm, and 20C resistance references. | Thresholds should remain screening values with explicit RPM/temperature conditions on the page. |
| Component names collide across distributor and alternator contexts | 1982 distributor listing contains Magnet Assy (22158-S6700), Stator (22163-Q1700), Pickup Kit, and engine-variant distributor assemblies. | Hybrid page must surface a component-boundary map so users do not confuse similarly named parts. |
| Safety agencies report severe failures from counterfeit auto safety parts | NHTSA 2024 alert and USTR 2023 report both document high-impact counterfeit part failures (including non-deployment and shrapnel events). | Risk layer must include provenance and supplier-verification actions when OEM parts are discontinued. |
Known thresholds and boundary numbers
Numeric anchors used by the checker with explicit source mapping.
| Metric | Screening band | Decision reason | Source |
|---|---|---|---|
| Charging-screen marker (EL-20, 1,500 rpm) | 13 to 15 V expected | Separates plausible charging operation from immediate under/overcharge escalation cases. | S1 |
| High-side chart marker (EL-20) | More than 15.5 V = review/escalation gate | Keeps overcharge-path checks visible before users commit to distributor-only repair actions. | S1 |
| Regulated output specification | 14.4-15.0 V | Tighter reference helps interpret borderline readings in charging-path troubleshooting. | S1 |
| Hot output current reference | More than 50 A at 2,500 rpm | Adds current-delivery boundary so acceptable voltage does not hide weak alternator output under load. | S1 |
| Alternator rotor resistance (20C) | 3.8 ohm reference | Anchors internal alternator checks and prevents subsystem confusion. | S1 |
| Alternator stator resistance per phase (20C) | 0.057 ohm reference | Very low-ohm measurement requires lead compensation to avoid false defect calls. | S1 |
| Low-ohm measurement boundary | Lead resistance can be ~0.3 ohm; use REL and consider 4-wire methods | At very low ohms, metrology error can be larger than DUT resistance unless lead error is actively removed. | S4, S5 |
| OEM lifecycle + fitment availability | 22158-S6700 listed as discontinued; fitment table unavailable | Discontinued/no-fitment state requires conservative procurement decisions and stronger verification. | S2 |
| Distributor component distinction | 22158-S6700 Magnet Assy vs 22163-Q1700 Stator vs 22229-Q1700 Pickup Kit | Separates similarly named distributor components so users do not mis-route repairs. | S3 |
Concept boundary map (same words, different parts)
Prevents term-collision errors between distributor and charging subsystems.
| Search term/component label | Actual component | Subsystem | Use when | Confusion risk | Source |
|---|---|---|---|---|---|
| 22158-S6700 Magnet Assy | Distributor magnet assembly | Ignition / distributor | Distributor pickup-magnet failure or brittle-magnet symptoms are confirmed | Often misread as alternator stator hardware because of keyword overlap. | S2, S3 |
| 22163-Q1700 Stator | Distributor stator element | Ignition / distributor | Distributor-internal service where stator-specific wear/damage is identified | The word "stator" can be wrongly mapped to charging-system alternator windings. | S3 |
| Alternator stator winding (per phase) | Charging alternator winding | Charging system | No-charge or overcharge diagnostics with voltage/current/resistance checks from EL references | Treating this as a distributor-only issue can delay root-cause repair and add rework cost. | S1 |
Variant fitment boundary table
Engine/distributor context changes ordering confidence and next-step actions.
| Engine context | Distributor examples | Decision boundary | Source |
|---|---|---|---|
| L28E (1982 listing) | 22100-P7106 / 22100-P7901 (Hitachi D6K8-03 / D6K80-03) | Do not assume turbo interchange even if search results look similar by title. | S3 |
| L28ET turbo (1982 listing) | 22100-P9000 (Hitachi D6P80-02) | Treat turbo configurations as separate fitment path before ordering magnet/distributor parts. | S3 |
| Unknown engine/distributor ID | Official Nissan endpoint shows no fitment rows for 22158-S6700 | Require VIN-era and distributor ID checks before approving any purchase. | S2, S3 |
Who should use this page (and who should not)
Applies to both do-intent and know-intent users in one flow.
| Audience | Fit | Why |
|---|---|---|
| 280ZX owner replacing distributor reluctor magnet | Good fit | Tool returns immediate routing, risk score, and next-step procurement checks. |
| Technician triaging no-charge complaints | Good fit | FSM-linked voltage and resistance boundaries support fast intake decisions. |
| User with low-fidelity measurements only | Partial fit | Usable for triage, but confidence becomes medium until continuity and compensated resistance checks are completed. |
| Buyer expecting new OEM stock only | Partial fit | Official discontinued status and missing fitment rows require fallback path plus variant verification. |
| Owner without engine/distributor identification | Partial fit | Checker provides a conservative route, but purchase approval stays blocked until variant evidence is collected. |
| User without subsystem classification | Not fit | Without identifying distributor vs alternator path, any recommendation stays conservative. |
| User expecting legal/compliance advice | Not fit | This page provides engineering screening only, not legal or warranty decisions. |
Methodology and evidence layer
The report layer exists to justify trust: what is measured, how verdicts are produced, and where evidence is thin.
Method flow used in the checker
Deterministic flow from input validation to action recommendation.
| Step | What we do | Output |
|---|---|---|
| Input normalization | Collect intent, model family, engine variant, voltage readings, low-ohm values, continuity, and physical condition notes. | Validated numeric + categorical inputs |
| Intent routing | Prioritize distributor replacement flow or alternator diagnostic flow before any recommendation. | Route-specific weighting for verdict mapping |
| Measurement fidelity control | Apply lead-resistance compensation for low-ohm checks and mark uncertainty when compensation is absent, with Fluke/Keysight-backed boundary notes. | Measured vs effective resistance context |
| Source-weighted evidence merge | Prioritize OEM manual + official parts endpoint + regulator data, then use catalog/community sources as secondary context. | Conclusion confidence reflects source authority and contradiction handling |
| Boundary scoring | Evaluate charging bands, high-voltage trigger, resistance references, and hard-fault cues. | Risk score + pass/review status flags |
| Verdict mapping | Map score and hard triggers into distributor-first, charging-path, or stop-and-inspect states. | Interpreted verdict with confidence |
| Action path generation | Attach minimum executable next action and disclosure for each verdict state. | Actionable follow-up, not raw values only |
Evidence confidence map
S1-S7 carry core threshold, fitment, metrology, and safety-risk logic for this page. S8-S9 remain context-only and never standalone pass/fail authority.
Known unknowns
Model-specific resistance and AC thresholds may vary. Always confirm with your exact factory service manual.
Source transparency and usage
Each core conclusion is traceable to source IDs and confidence level.
| ID | Source | Key data used | Confidence | Date context |
|---|---|---|---|---|
| S1 | 1982 Nissan 280ZX FSM, Electrical System (EL) chapter | EL-20/21/25 provides 1,500-rpm voltage markers, 14.4-15.0 V regulated output, >50 A at 2,500 rpm, and 20C rotor/stator resistance references. | High (OEM manual mirror) | 1982 document; extracted April 13, 2026 |
| S2 | Official Nissan USA parts store (22158-S6700) | Lists Magnet Assembly 22158-S6700 as discontinued with no fitment rows, creating a verification-first procurement boundary. | High (official OEM endpoint) | Accessed April 13, 2026 |
| S3 | 1982 Nissan 280ZX distributor/ignition parts listing | Separates 22158-S6700 Magnet Assy, 22163-Q1700 Stator, 22229-Q1700 Pickup Kit and shows L28E vs L28ET distributor assembly differences. | Medium-high (catalog mirror) | Accessed April 13, 2026 |
| S4 | Fluke application note: low-ohm measurements | States lead resistance can significantly distort very low-ohm readings and recommends REL/zero compensation. | Medium-high (instrument manufacturer) | Accessed April 13, 2026 |
| S5 | Keysight resistance measurement guidance | Recommends 4-wire/remote-sense methods when lead resistance is comparable to DUT resistance. | Medium-high (instrument manufacturer) | Accessed April 13, 2026 |
| S6 | NHTSA air bag safety page | Contains 2024 consumer alert details on fatalities/injuries linked to faulty aftermarket replacement inflators and warns about counterfeit non-deployment/shrapnel risk. | High (U.S. regulator) | Accessed April 13, 2026 |
| S7 | USTR 2023 Notorious Markets Report | Reports counterfeit auto-part safety failures (including counterfeit airbags/brakes) and documents enforcement/seizure context. | High (U.S. government report) | 2023 report; accessed April 13, 2026 |
| S8 | The Z Store product page (aftermarket context) | Lists distributor reluctor magnet for 79-83 280ZX non-turbo, useful for market-intent mapping but not OEM authority. | Medium | Accessed April 13, 2026 |
| S9 | ZCar forum thread (community context) | Shows user demand and failure anecdotes around distributor magnet replacement; kept as contextual signal only. | Low (community) | Thread date 2023; accessed April 13, 2026 |
Alternatives and tradeoffs
Comparison layer helps avoid a single-path bias after checker output.
Repair path comparison
Compare time, cost, and reliability before approving work scope.
| Option | Speed | Cost | Reliability outlook | When to use |
|---|---|---|---|---|
| Distributor magnet replacement only | Fast if stock is available | Low to medium | Medium | Use when symptoms and intent strongly match distributor pickup magnet failure. |
| Distributor rebuild / reman path | Medium to slow | Medium | Medium to high (depends on traceability) | Use when OEM supply is discontinued and donor/component quality can be documented. |
| Alternator charging diagnostics first | Medium | Medium | High | Use when measured voltage behavior is outside EL thresholds or no-charge symptoms dominate. |
| Blind title-match ordering from unknown channel | Fast | Low now, potentially high rework + safety exposure | Low | Not recommended; this is the primary failure mode for ambiguous "stator magnet" queries. |
| Variant-verified procurement path | Medium | Medium | High | Best when engine variant and distributor ID are confirmed and supplier provenance is traceable. |
| Full wiring + charging-path audit | Slow | Highest | Highest | Best for repeated failures, mixed no-start/no-charge symptoms, or undocumented modifications. |
Scenario walkthroughs
Cases include assumptions, checker outcome, and minimum next step.
| Scenario | Assumptions | Tool outcome | Minimum next step |
|---|---|---|---|
| Distributor replacement request with visible ring crack | Intent distributor, engine variant L28E, charging readings in-band, magnet marked hairline crack, harness clean. | distributor-first (score ~76-82) | Verify part lineage + supplier quality, then replace or rebuild distributor path. |
| No-charge complaint with high-voltage swing | Intent set to alternator charging stator, reading exceeds high-side threshold, magnet condition intact. | charging-path (score 58) | Run regulator/alternator diagnostics before any distributor-related purchase. |
| Low-ohm reading without compensation | Measured 0.09 ohm with 0.08-ohm leads and no REL compensation, charging near nominal. | charging-path (medium confidence) | Apply compensation and rerun before declaring alternator stator defect. |
| Turbo listing mismatch risk | Intent distributor, engine variant L28ET, user starts from non-turbo product listing title only. | distributor-first (medium confidence) | Pause ordering and validate distributor ID/variant mapping before any checkout decision. |
| Broken magnet fragments with unknown continuity | Intent distributor, magnet broken/missing, continuity not tested, harness not confirmed. | stop-and-inspect (score 36) | Stop-run, inspect distributor internals and related wiring, then rerun checks before restart. |
| Ambiguous keyword with mixed signals | Intent not sure, charging near low boundary, magnet not inspected, continuity missing. | charging-path (medium confidence) | Collect continuity + subsystem symptom evidence before part ordering. |
| Discontinued OEM part pushes buyer to unknown seller | User has minimal measurements and no provenance records for substitute parts. | charging-path or stop-and-inspect (medium confidence) | Complete minimum measurements, confirm variant, and require traceable supplier evidence before purchase. |
Risk matrix and mitigations
Misuse risk, cost risk, and scenario mismatch risk are mapped with concrete mitigation actions.
Risk register for 280ZX stator magnet decisions
Every risk row includes a trigger and execution-ready mitigation.
| Risk | Probability | Impact | Mitigation action | Trigger |
|---|---|---|---|---|
| Intent mismatch leads to wrong part family purchase | High | High | Require intent classification and at least one subsystem-specific measurement before order approval. | User proceeds with only keyword match |
| Low-ohm alternator measurements distorted by meter leads | High | Medium | Capture lead resistance, apply REL/zero compensation, and retest before declaring alternator stator failure. | Phase resistance near boundary with compensation = no |
| Missing continuity test hides hard fault | High | High | Block non-critical recommendations until continuity-to-ground status is confirmed. | Ground test marked "not tested" |
| Overcharge path ignored | Medium | High | Escalate regulator and alternator checks when readings exceed EL high-side threshold. | Charging reading above 15.5 V |
| Undercharging misattributed to battery only | High | Medium | Cross-check alternator-side values and harness condition before battery-only replacement decisions. | Charging reading below 13 V |
| Discontinued part availability drives low-quality substitutes | Medium | High | Verify supplier credibility, traceability, and fitment evidence before buying substitute components. | 22158-S6700 direct-order path selected |
| Counterfeit replacement part introduces safety-critical failure | Medium | High | Use traceable channels and reject unknown provenance; align risk decisions with NHTSA/USTR counterfeit alerts. | Discontinued OEM path + unverified seller/source |
| Catalog ambiguity across variants causes fitment mismatch | Medium | Medium | Bind order decisions to engine/distributor variant checks before purchase authorization. | Engine variant unknown or turbo/non-turbo context mixed |
| Harness heat damage ignored | Medium | Medium | Inspect connector heat marks and repair harness path before new stator install. | Harness condition = heat-damaged |
Disclosure and decision boundary
This hybrid page is an engineering screening workflow. It is not a legal, warranty, or safety certification decision. Final repair or replacement release must follow the exact model service manual and qualified technician process.
FAQ and conversion layer
Decision-focused FAQ first, then direct CTA and related internal routes.
Decision FAQ by intent
Grouped for operation, repair boundary, and evidence trust.
Next actions
Move from screening to execution without leaving the intent scope.