Brand Name:
Volvo
Model Number:
TG-81SC ;AWF8F45
Function: Hydraulic control unit for Aisin 8-speed RWD transmissions (torque capacity 500Nm+), managing clutch apply and shift timing.
Key Features:
Solenoid Configuration: 9x direct-acting PWM solenoids (no ECCC logic)
Pressure Control: Dual-range regulator valve (30-120 psi base/300 psi clutch apply)
Material: Aluminum die-cast with laser-bored channels
Failure Modes:
Solenoid Fatigue: Shift solenoids 3/5 wear first (P0756/P0776)
Valve Bore Wear: Particularly shift valve 2 (causes 4-5 flare)
Check Ball Jamming: Debris locks separator plates
Critical Specs:
Solenoid resistance: 5.5Ω ±0.5Ω
Valve bore clearance: <0.02mm
Test pressure: 85 psi @ 20°C
Pro Tip: Post-installation, perform line pressure learn (requires Aisin Tool or OEM scanner)
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