8AT TG-81SC Automatic Transmission Valve Body Assembly Without Start-stop Function 9 Electromagnetic Valve Version
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Function: Hydraulic control unit for Aisin 8-speed RWD transmissions (torque capacity 500Nm+), managing clutch apply and shift timing.
Key Features:
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Solenoid Configuration: 9x direct-acting PWM solenoids (no ECCC logic)
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Pressure Control: Dual-range regulator valve (30-120 psi base/300 psi clutch apply)
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Material: Aluminum die-cast with laser-bored channels
Failure Modes:
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Solenoid Fatigue: Shift solenoids 3/5 wear first (P0756/P0776)
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Valve Bore Wear: Particularly shift valve 2 (causes 4-5 flare)
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Check Ball Jamming: Debris locks separator plates
Critical Specs:
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Solenoid resistance: 5.5Ω ±0.5Ω
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Valve bore clearance: <0.02mm
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Test pressure: 85 psi @ 20°C
Pro Tip: Post-installation, perform line pressure learn (requires Aisin Tool or OEM scanner)

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8AT automatic transmission valve body
,Start-stop automatic transmission valve body
,electromagnetic valve 8AT valve body
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