BK400 vs J1939FaultCode

BK400 is a professional Bluetooth car battery diagnostic tool. Connect to BK400 hardware via Bluetooth to monitor real-time voltage, plot live curves, and perform cranking tests, charging tests, and waveform analysis to fully evaluate battery health. Schedule automatic voltage sampling tasks and review historical data with interactive charts across customizable date ranges. Manage multiple devices simultaneously with fully isolated data. Built-in OTA firmware updates keep your device current. Use the vehicle finder to locate your car on a map. Generate professional diagnostic reports with one tap and share them with customers. Supports 15 languages for users worldwide. BK400 是一款专业的汽车蓄电池蓝牙智能检测工具。通过蓝牙连接 BK400 硬件设备，您可以实时监控电池电压、绘制电压曲线，并进行启动测试、充电测试和波形测试，全面评估电池健康状态。支持静态电压采集和定时任务，自动记录历史数据并生成可视化图表，支持按日期范围查看趋势。多设备同时管理，数据完全隔离互不干扰。内置 OTA 固件升级功能，确保设备始终运行最新版本。寻车功能通过地图标注设备位置，轻松找到您的车辆。一键生成包含启动测试与充电测试数据的专业检测报告，方便分享给客户。支持 15 种语言，满足全球用户需求。

J1939 Fault Code Lookup is the offline diagnostic reference for commercial-vehicle technicians, fleet mechanics and field engineers. Decode SAE J1939 diagnostic trouble codes in seconds — no internet connection required. KEY FEATURES ■ SPN Search Look up Suspect Parameter Numbers by number or keyword. See full parameter definitions including unit, range and resolution. ■ FMI Reference 23 bundled FMI definitions (0–21 and 31). Uncovered identifiers are reported explicitly. ■ DTC Diagnosis Look up covered SPN + FMI combinations. The fault database has 61 SPNs, 23 FMIs and 57 brand mappings. FMI-based guidance is general reference, not manufacturer/model-specific diagnosis. ■ Equipment Fault Records Organize an equipment alias, date, multiple fault codes, notes and review status. Draft and preview for free; Pro saves, edits and exports text reports. Uncovered codes can be recorded without invented definitions. ■ Brand Fault Codes Cross-reference OEM codes from Cummins, Bosch, Weichai, Yuchai and common aftertreatment systems. ■ CAN Signal Database 2,900+ J1939 messages and 16,000+ signal definitions with start bit, length, scaling, offset, range and enum values — perfect for calibration and network troubleshooting. ■ Favorites & History Bookmark frequently used codes; your search history is saved automatically. ■ 100% Offline Every database is built into the app. Underground garage, remote job site, no signal — it just works. PRO UPGRADE (one-time purchase) • Removes all ads (banner + interstitial) • Unlimited signal database detail views (free tier: 3 per day) • Save/edit local equipment records and export multi-fault text reports One-time purchase. Saved records remain viewable, deletable and exportable after revocation. Existing basic lookups, favorites/history and single-code copying/sharing stay free. WHO IS IT FOR Truck, bus and heavy-equipment technicians, service engineers, fleet managers, automotive electronics and calibration engineers, vocational students. DISCLAIMER All information is provided for reference only. Always consult the OEM's official service documentation before performing repairs. Records stay on your device, with no account or cloud sync. Export before deleting the app. Lookups and records work offline; purchases, restores and ads need a network connection.