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Understanding and Troubleshooting the Allison Transmission Pressure Switch Manifold (PSM)
"The pressure switch manifold (PSM) is a critical electromechanical component in Allison 1000, 2000, 3000, and 4000 series transmissions that monitors hydraulic pressure across multiple clutch circuits. By converting fluid pressure into electrical signals, the PSM allows the Transmission Control Module (TCM) to verify that the correct gear has been engaged and that hydraulic integrity is maintained during operation. In the world of heavy-duty and medium-duty trucking, the Allison transmission is renowned for its durability. However, the sophistication of its electronic control system means that even a minor failure in a sensing component can l..."
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