{"product_id":"new-1pc-for-williams-controls-electronic-accelerator-pedal-sensor-402422d","title":"new 1PC Williams Controls Accelerator Pedal Sensor 402422D","description":"\u003carticle class=\"koeed-container\"\u003e\n  \u003c!-- Engineer's Quick Brief --\u003e\n  \u003csection class=\"koeed-section\"\u003e\n    \u003ch2 style=\"color: #16c8c8;\"\u003eEngineer's Quick Brief\u003c\/h2\u003e\n    \u003cul\u003e\n      \u003cli\u003e\n\u003cstrong\u003eECM Safety Redundancy:\u003c\/strong\u003e The \u003cstrong\u003eWilliams Controls 402422D\u003c\/strong\u003e Accelerator Pedal Sensor (APS) utilizes dual independent signal outputs, ensuring continuous safety monitoring by the Engine Control Module (ECM) to prevent unintended acceleration.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eHeavy-Duty Reliability:\u003c\/strong\u003e Engineered for commercial vehicles and off-highway machinery, featuring ruggedized housing resistant to cabin moisture, vibration, and extreme temperature fluctuations.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eDrive-by-Wire Precision:\u003c\/strong\u003e Provides smooth, linear voltage sweeps across the entire pedal travel, translating operator input into precise throttle control and optimized fuel injection.\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/section\u003e\n\n  \u003c!-- SEO Introduction --\u003e\n  \u003csection class=\"koeed-section\"\u003e\n    \u003ch3\u003eWilliams Controls 402422D Accelerator Pedal Sensor (APS)\u003c\/h3\u003e\n    \u003cp\u003eThe \u003cstrong\u003eWilliams Controls 402422D\u003c\/strong\u003e (now part of Curtiss-Wright) is a commercial-grade \u003cstrong\u003eAccelerator Pedal Position Sensor\u003c\/strong\u003e designed for Electronic Throttle Control (ETC) systems in heavy-duty trucks, transit buses, and industrial vehicles. Acting as the critical interface between the driver and the engine management system, this sensor relies on precise internal potentiometric or \u003cstrong\u003eHall-effect technology\u003c\/strong\u003e to monitor the pedal's rotational angle. To comply with rigorous commercial safety standards, it outputs two distinct \u003cstrong\u003eanalog signals\u003c\/strong\u003e. If the ECM detects a discrepancy between these two signals, it immediately triggers a diagnostic trouble code (DTC) and defaults to a \"limp mode\", making reliable sensors like the 402422D essential for fleet uptime.\u003c\/p\u003e\n  \u003c\/section\u003e\n\n  \u003c!-- Technical Specifications Table --\u003e\n  \u003csection class=\"koeed-section\"\u003e\n    \u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n    \u003cdiv style=\"overflow-x: auto;\"\u003e\n      \u003ctable style=\"width: 100%; border-collapse: collapse; border: 1px solid #eeeeee; font-size: 14px;\"\u003e\n        \u003cthead\u003e\n          \u003ctr style=\"background-color: #16c8c8; color: #ffffff;\"\u003e\n            \u003cth style=\"padding: 12px; text-align: left;\"\u003eCategory\u003c\/th\u003e\n            \u003cth style=\"padding: 12px; text-align: left;\"\u003eDetailed Specification\u003c\/th\u003e\n          \u003c\/tr\u003e\n        \u003c\/thead\u003e\n        \u003ctbody\u003e\n          \u003ctr style=\"background-color: #f4fcfc;\"\u003e\n            \u003ctd style=\"padding: 10px; border-bottom: 1px solid #eeeeee;\"\u003e\u003cstrong\u003eBrand \/ Manufacturer\u003c\/strong\u003e\u003c\/td\u003e\n            \u003ctd style=\"padding: 10px; border-bottom: 1px solid #eeeeee;\"\u003eWilliams Controls (Curtiss-Wright)\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr style=\"background-color: #fafafa;\"\u003e\n            \u003ctd style=\"padding: 10px; border-bottom: 1px solid #eeeeee;\"\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n            \u003ctd style=\"padding: 10px; border-bottom: 1px solid #eeeeee;\"\u003e402422D\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr style=\"background-color: #f4fcfc;\"\u003e\n            \u003ctd style=\"padding: 10px; border-bottom: 1px solid #eeeeee;\"\u003e\u003cstrong\u003eComponent Type\u003c\/strong\u003e\u003c\/td\u003e\n            \u003ctd style=\"padding: 10px; border-bottom: 1px solid #eeeeee;\"\u003eRotary Position Sensor \/ Throttle Position Sensor (TPS)\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr style=\"background-color: #fafafa;\"\u003e\n            \u003ctd style=\"padding: 10px; border-bottom: 1px solid #eeeeee;\"\u003e\u003cstrong\u003eSignal Output\u003c\/strong\u003e\u003c\/td\u003e\n            \u003ctd style=\"padding: 10px; border-bottom: 1px solid #eeeeee;\"\u003eDual Analog Channels (Signal 1 \u0026amp; Signal 2)\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr style=\"background-color: #f4fcfc;\"\u003e\n            \u003ctd style=\"padding: 10px; border-bottom: 1px solid #eeeeee;\"\u003e\u003cstrong\u003eReference Voltage\u003c\/strong\u003e\u003c\/td\u003e\n            \u003ctd style=\"padding: 10px; border-bottom: 1px solid #eeeeee;\"\u003e5V DC (Supplied by Engine Control Module)\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr style=\"background-color: #fafafa;\"\u003e\n            \u003ctd style=\"padding: 10px; border-bottom: 1px solid #eeeeee;\"\u003e\u003cstrong\u003eMounting\u003c\/strong\u003e\u003c\/td\u003e\n            \u003ctd style=\"padding: 10px; border-bottom: 1px solid #eeeeee;\"\u003eDirect bolt-on to Williams Controls pedal assemblies\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr style=\"background-color: #f4fcfc;\"\u003e\n            \u003ctd style=\"padding: 10px; border-bottom: 1px solid #eeeeee;\"\u003e\u003cstrong\u003eApplication Environment\u003c\/strong\u003e\u003c\/td\u003e\n            \u003ctd style=\"padding: 10px; border-bottom: 1px solid #eeeeee;\"\u003eHeavy-Duty Commercial (Trucks, Buses, Agriculture)\u003c\/td\u003e\n          \u003c\/tr\u003e\n        \u003c\/tbody\u003e\n      \u003c\/table\u003e\n    \u003c\/div\u003e\n  \u003c\/section\u003e\n\n  \u003c!-- Application Matrix --\u003e\n  \u003csection class=\"koeed-section\"\u003e\n    \u003ch3\u003eCommercial Fleet Application Matrix\u003c\/h3\u003e\n    \u003cul\u003e\n      \u003cli\u003e\n\u003cstrong\u003eHeavy-Duty Trucks (Class 8):\u003c\/strong\u003e Restores precise RPM control and resolves sporadic \"limp mode\" issues caused by worn original sensors.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eTransit \u0026amp; Coach Buses:\u003c\/strong\u003e Ensures smooth acceleration profiles, maximizing passenger comfort and drivetrain longevity.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eOff-Highway Machinery:\u003c\/strong\u003e Delivers robust drive-by-wire reliability in high-vibration construction and agricultural environments.\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/section\u003e\n\n  \u003c!-- Koeed B2B Tool: Dual Channel Correlation Tester --\u003e\n  \u003csection class=\"koeed-section\" id=\"koeed-tps-tool\" style=\"background: #f9f9f9; padding: 25px; border-radius: 8px; border: 2px solid #16c8c8; margin: 30px 0;\"\u003e\n    \u003ch3 style=\"margin-top: 0; color: #16c8c8;\"\u003eDual-Channel APS Voltage Correlation Tester\u003c\/h3\u003e\n    \u003cp style=\"font-size: 13px;\"\u003eDiagnostic tools often flag \u003cem\u003e\"Pedal Position Sensor Correlation Error\"\u003c\/em\u003e. Use a multimeter to probe the dual signal lines and verify if the sensor outputs fall within standard OEM tolerances.\u003c\/p\u003e\n    \n    \u003cdiv style=\"display: grid; grid-template-columns: 1fr 1fr; gap: 15px; margin-bottom: 15px;\"\u003e\n      \u003cdiv style=\"grid-column: span 2;\"\u003e\n        \u003clabel style=\"display:block; font-size: 12px; font-weight: bold;\"\u003eOEM Sensor Tracking Ratio:\u003c\/label\u003e\n        \u003cselect id=\"koeed-ratio-type\" style=\"width: 100%; padding: 8px; border: 1px solid #ccc; border-radius: 4px;\"\u003e\n          \u003coption value=\"2:1\"\u003e2:1 Ratio (Most Common - e.g., Signal 1 is twice Signal 2)\u003c\/option\u003e\n          \u003coption value=\"1:1\"\u003e1:1 Ratio (Signal 1 \u0026amp; Signal 2 match identically)\u003c\/option\u003e\n        \u003c\/select\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003clabel style=\"display:block; font-size: 12px; font-weight: bold;\"\u003eMeasured Signal 1 (Volts):\u003c\/label\u003e\n        \u003cinput type=\"number\" id=\"koeed-v1\" placeholder=\"e.g., 1.50\" step=\"0.01\" style=\"width: 100%; padding: 8px; border: 1px solid #ccc; border-radius: 4px;\"\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003clabel style=\"display:block; font-size: 12px; font-weight: bold;\"\u003eMeasured Signal 2 (Volts):\u003c\/label\u003e\n        \u003cinput type=\"number\" id=\"koeed-v2\" placeholder=\"e.g., 0.75\" step=\"0.01\" style=\"width: 100%; padding: 8px; border: 1px solid #ccc; border-radius: 4px;\"\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n    \n    \u003cbutton onclick=\"koeedAnalyzeCorrelation()\" style=\"background: #16c8c8; color: #fff; border: none; padding: 12px; border-radius: 4px; cursor: pointer; font-weight: bold; width: 100%;\"\u003eRun Diagnostic Analysis\u003c\/button\u003e\n    \n    \u003cdiv id=\"koeed-tps-result\" style=\"margin-top: 15px; padding: 15px; background: #fff; border-left: 4px solid #16c8c8; font-family: monospace; display: none;\"\u003e\n      \u003c!-- Result injected here --\u003e\n    \u003c\/div\u003e\n    \u003cnoscript\u003e\u003cp\u003ePlease enable JavaScript to use the TPS correlation diagnostic tool.\u003c\/p\u003e\u003c\/noscript\u003e\n  \u003c\/section\u003e\n\n  \u003cscript\u003e\n    function koeedAnalyzeCorrelation() {\n      const v1 = parseFloat(document.getElementById('koeed-v1').value);\n      const v2 = parseFloat(document.getElementById('koeed-v2').value);\n      const ratioType = document.getElementById('koeed-ratio-type').value;\n      const resultDiv = document.getElementById('koeed-tps-result');\n      \n      if (isNaN(v1) || isNaN(v2)) {\n        resultDiv.style.display = 'block';\n        resultDiv.innerHTML = `\u003cspan style=\"color:red;\"\u003eError: Please enter valid voltage readings for both channels.\u003c\/span\u003e`;\n        return;\n      }\n\n      let expectedV1, diff, allowedTolerance = 0.25; \/\/ 0.25V is a typical heavy-duty ECM tolerance\n      \n      if (ratioType === '2:1') {\n        expectedV1 = v2 * 2;\n      } else {\n        expectedV1 = v2;\n      }\n\n      diff = Math.abs(v1 - expectedV1);\n      \n      let statusHtml = \"\";\n      if (diff \u003c= allowedTolerance) {\n        statusHtml = `\u003cspan style=\"color: green; font-weight: bold;\"\u003ePASS - Signals are Correlated\u003c\/span\u003e\u003cbr\u003eThe voltage difference (${diff.toFixed(2)}V) is within acceptable ECM tolerances.`;\n      } else {\n        statusHtml = `\u003cspan style=\"color: red; font-weight: bold;\"\u003eFAIL - Correlation Error Detected\u003c\/span\u003e\u003cbr\u003eThe difference deviates by ${diff.toFixed(2)}V from expected limits. The ECM will likely flag a DTC and induce Limp Mode. Check wiring, ground, or replace the sensor.`;\n      }\n\n      resultDiv.style.display = 'block';\n      resultDiv.innerHTML = `\n        \u003cstrong\u003eDiagnostic Results:\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003e\n        ${statusHtml}\u003cbr\u003e\u003cbr\u003e\n        \u003cul style=\"font-size: 11px; color: #666; margin-top: 10px; padding-left: 20px;\"\u003e\n          \u003cli\u003eNote: The ECM supplies a strict 5.0V reference. Verify this reference voltage first.\u003c\/li\u003e\n          \u003cli\u003eIf both V1 and V2 are 0V or 5V, check for a broken ground or short circuit in the wiring harness.\u003c\/li\u003e\n        \u003c\/ul\u003e\n      `;\n    }\n  \u003c\/script\u003e\n\n  \u003c!-- Troubleshooting \u0026 FAQ --\u003e\n  \u003csection class=\"koeed-section\"\u003e\n    \u003ch3\u003eTroubleshooting \u0026amp; Maintenance FAQ\u003c\/h3\u003e\n    \u003cdiv class=\"koeed-faq\"\u003e\n      \u003cp\u003e\u003cstrong\u003eQ: Why does my truck immediately lose acceleration power and trigger a Check Engine Light?\u003c\/strong\u003e\u003cbr\u003e\n      A: This is a classic symptom of a failed accelerator pedal sensor triggering \u003cstrong\u003eLimp Mode\u003c\/strong\u003e. The ECM detects an abnormal sweep or a mismatch between the dual sensor tracks and limits engine RPM to a safe idling speed to prevent runaway acceleration.\u003c\/p\u003e\n      \n      \u003cp\u003e\u003cstrong\u003eQ: How do I test the Williams Controls 402422D sensor before replacing it?\u003c\/strong\u003e\u003cbr\u003e\n      A: Unplug the connector and verify that the ECM is sending a stable \u003cstrong\u003e5V reference\u003c\/strong\u003e and a solid ground to the sensor plug. Next, back-probe the signal wires while slowly depressing the pedal. The voltages should increase linearly without any sudden drops or spikes (dropouts). You can use the Koeed Diagnostic Tool above to check signal correlation.\u003c\/p\u003e\n\n      \u003cp\u003e\u003cstrong\u003eQ: Do I need to perform a \"relearn\" procedure after installing the new sensor?\u003c\/strong\u003e\u003cbr\u003e\n      A: In many modern heavy-duty trucks (e.g., Cummins or Detroit Diesel platforms), simply replacing the sensor and clearing the existing DTCs via a heavy-duty OBD scanner is sufficient. However, always refer to the specific engine manufacturer's service manual, as some ECMs require a pedal calibration procedure.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/section\u003e\n\n  \u003c!-- Cross-Reference \u0026 Selection --\u003e\n  \u003csection class=\"koeed-section\"\u003e\n    \u003ch3\u003eCross-Reference Guide\u003c\/h3\u003e\n    \u003cdiv style=\"overflow-x: auto;\"\u003e\n      \u003ctable style=\"width: 100%; border-collapse: collapse; font-size: 13px;\"\u003e\n        \u003ctr style=\"border-bottom: 1px solid #eee;\"\u003e\n          \u003ctd style=\"padding: 8px;\"\u003e\u003cstrong\u003eManufacturer Legacy\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"padding: 8px;\"\u003eWilliams Controls (Now manufactured under Curtiss-Wright Industrial Group)\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"border-bottom: 1px solid #eee;\"\u003e\n          \u003ctd style=\"padding: 8px;\"\u003e\u003cstrong\u003eOEM Cross-Reference\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"padding: 8px;\"\u003eOften cross-references with specific OEM part numbers for PACCAR, Navistar, or Freightliner pedal assemblies. Match visual housing and plug orientation.\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd style=\"padding: 8px;\"\u003e\u003cstrong\u003eRelated Sub-Components\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"padding: 8px;\"\u003eWilliams Controls WM526 \/ WM528 series suspended pedal assemblies.\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/table\u003e\n    \u003c\/div\u003e\n  \u003c\/section\u003e\n\n  \u003c!-- Structured Data (FAQPage \u0026 WebApp) --\u003e\n  \u003cscript type=\"application\/ld+json\"\u003e\n  {\n    \"@context\": \"https:\/\/schema.org\",\n    \"@type\": \"FAQPage\",\n    \"mainEntity\": [\n      {\n        \"@type\": \"Question\",\n        \"name\": \"Why does a faulty pedal sensor cause a truck to go into limp mode?\",\n        \"acceptedAnswer\": {\n          \"@type\": \"Answer\",\n          \"text\": \"For safety, the Engine Control Module (ECM) monitors two independent signal channels from the pedal sensor. If it detects a mismatch or voltage dropout, it triggers a fault and restricts engine RPM (limp mode) to prevent unintended vehicle acceleration.\"\n        }\n      },\n      {\n        \"@type\": \"Question\",\n        \"name\": \"How to test the Williams Controls 402422D accelerator pedal sensor?\",\n        \"acceptedAnswer\": {\n          \"@type\": \"Answer\",\n          \"text\": \"Verify the 5V reference and ground from the ECM. Then, use a multimeter to monitor the dual signal outputs while smoothly pressing the pedal. The voltage should change linearly without spikes, and the two signals must maintain their specific OEM correlation ratio.\"\n        }\n      }\n    ]\n  }\n  \u003c\/script\u003e\n\n  \u003cscript type=\"application\/ld+json\"\u003e\n  {\n    \"@context\": \"https:\/\/schema.org\",\n    \"@type\": \"WebApplication\",\n    \"name\": \"Dual-Channel APS Voltage Correlation Tester\",\n    \"operatingSystem\": \"All\",\n    \"applicationCategory\": \"DiagnosticTool\",\n    \"description\": \"Calculates the voltage correlation between Sensor 1 and Sensor 2 outputs to diagnose Electronic Throttle Control (ETC) faults.\"\n  }\n  \u003c\/script\u003e\n\u003c\/article\u003e\n\n\u003cstyle\u003e\n  .koeed-container { line-height: 1.6; color: #333; font-family: -apple-system, BlinkMacSystemFont, \"Segoe UI\", Roboto, Helvetica, Arial, sans-serif; }\n  .koeed-section { margin-bottom: 30px; }\n  .koeed-section h2, .koeed-section h3 { margin-bottom: 15px; color: #16c8c8; border-bottom: 1px solid #eeeeee; padding-bottom: 5px; }\n  .koeed-faq p { margin-bottom: 15px; }\n  .koeed-section table th, .koeed-section table td { border: 1px solid #eeeeee; padding: 10px; }\n\u003c\/style\u003e","brand":"WILLIAMS CONTROLS","offers":[{"title":"Default Title","offer_id":44836624335033,"sku":"387293905131","price":93.16,"currency_code":"USD","in_stock":true}],"url":"https:\/\/koeed.com\/pl\/products\/new-1pc-for-williams-controls-electronic-accelerator-pedal-sensor-402422d","provider":"KOEED","version":"1.0","type":"link"}