294200-0380 Suction Control Valve SCV Valve for Denso HP4 Common Rail Fuel Pump

Product Overview

294200-0380 is the original Denso suction control valve, also known as SCV valve. It installs on Denso HP4 series high-pressure fuel pumps. Driven by PWM signals from the engine ECU, it precisely regulates fuel volume entering the plunger chamber to adjust fuel rail pressure in real time. This is a normally open inverse proportional solenoid. Higher ECU drive current reduces valve opening and rail pressure. This is the early short-type SCV valve; the upgraded long-type version 294200-0680 delivers better resistance to fuel contaminants and longer service life.

Key Specifications

FAQs

Q: What machines and engines work with 294200-0380 SCV valve?

A: John Deere: Tractors: 8130, 8230, 8330, 8430, 8530, 8270R, 8295R, 8320R, 8345R, 8360R with 6068 / 6090 engines. Excavators: 350GLC, E330, E360, E380, E400. Motor graders: 670G, 770G, 870G.

Isuzu: Machines with 6HK1 engine, including Hitachi & JCB excavators and Isuzu Forward trucks.

Hino & Mitsubishi: Excavators and commercial vehicles equipped with Hino J08E engine (Hino 500 series).

Q: What symptoms indicate a faulty suction control valve?

A: Rough idle and violent engine RPM fluctuation, slow throttle response, unexpected stalling or power limitation, loss of engine power. The dashboard may log fault codes related to abnormal common rail pressure or SCV drive circuit open/short errors.

Q: How does this inverse proportional SCV valve operate?

A: The ECU sends PWM signals to control the solenoid. Increased drive current narrows the valve opening, reducing fuel supply and lowering rail pressure. It dynamically adjusts fuel delivery to maintain stable common rail pressure under varying working loads.

Q: What should I note before ordering this SCV valve?

A: Confirm your fuel pump model and engine serial number. This is the short-type design, prone to sticking with contaminated fuel. Consider upgrading to 294200-0680 long-type version for enhanced durability if replacement is needed.

2942000380-suction-control-valve