Denso 294200-4750 Suction Control Valve Assembly

The Denso 294200-4750 Suction Control Valve (SCV) is a precision electromagnetic proportional valve designed for Denso HP3 and HP4 high-pressure common rail fuel pumps. It regulates fuel delivery volume to the high-pressure plunger by controlling the suction port opening via PWM signal from the ECU, maintaining target rail pressure up to 200 MPa. Constructed with a stainless steel valve body, hardened plunger, and high-temperature Viton seals, it ensures durability under extreme fuel temperatures and pressures. The valve features a 24V DC two-terminal connector interface compatible with Denso pump harnesses. It mounts directly on the pump housing with a flange and O-ring seal. This part supersedes or cross-references Denso 294200-2750 and Isuzu OEM 8-98145484-1 (8981454841). It is a critical component for Isuzu 4JJ1, 4HK1, 6HK1 and Hino E13C engines found in Hitachi Zaxis excavators, Isuzu N-Series trucks, Hino 500 Series, and Mitsubishi Fuso trucks. Failure symptoms include hard start, low power, rail pressure deviation codes (P0087, P0093), and engine stall.