29400-1221 04226-0L010 Common Rail SCV Suction Control Valve Application For Hino Isuzu

The 04226-OL010 (Suction Control ) is a critical component in diesel high-pressure common rail systems, designed to precisely regulate fuel supply pressure for optimal engine performance, fuel efficiency, and emissions control. This utilizes electromagnetic control technology to adjust fuel flow based on signals from the Engine Control Unit (ECU).

 

 

Primary Application: Bosch CP4.1 high-pressure common rail pump

Cross-Compatible Pumps:

Bosch CP3.4 (with ECU verification)

Delphi DP210 (limited compatibility) 5

3. Vehicle Applications & Model Years

This is widely used in diesel engines across multiple brands, including:

Japanese Commercial Vehicles

Hino Trucks:

J08E 7.7L engine (2014-2020)

500/700 Series trucks (2015-2020) 35

Isuzu:

4JJ1/4HK1 engines (2013-2018)

D-Max / MU-X (2015-2020) 5

European Trucks

Volvo D13 (2012-2016)

MAN D26 (2014-2018) 5

 

 

Precision Control: Maintains fuel pressure within ±5 bar under varying loads.

Durable Construction: Features wear-resistant alloy components for extended service life.

Diagnostic Support: Some variants include fault memory for easier troubleshooting.

 

 

 

Fault Codes: P0087 (Low Fuel Pressure), P0251 ( Control Out of Range).

Maintenance Tips:

Replace diesel filters regularly to prevent contamination.

Check resistance (standard: 2.8Ω ± 0.3Ω).

Product Introduction: 29400-1221

The 29400-1221 (Suction Control ) is a precision-engineered component designed for diesel high-pressure common rail systems. It regulates fuel supply pressure to optimize engine performance, fuel efficiency, and emissions control. This operates via electromagnetic control, adjusting fuel flow based on signals from the engine control unit (ECU).

Compatible Fuel Pumps

Primary Application: Denso HP3.8 high-pressure common rail pump

Cross-Compatible Pumps:

Bosch CP3.4 (with ECU verification)

Delphi DFI1.4 (requires harness modification)

Vehicle Applications & Model Years

This is widely used in diesel engines, including:

Toyota Land Cruiser 200 Series (1VD-FTV 4.5L, 2012-2018)

Hino 500/700 Series Trucks (J08E 7.7L, 2014-2020)

Isuzu Giga (6WG1 15.6L, 2015-2020)

Installation Guide: 29400-1221 04226-0L010

 

 

The CP4.2 pump operates through three key stages:

Low-Pressure Stage:

Gear pump (integrated in CP4.2) draws fuel from tank at 4-6 bar

Fuel passes through 10μm pre-filter

High-Pressure Generation:

Three-plunger radial pump design

17° camshaft creates 2200 bar maximum pressure

precisely controls inlet metering quantity

Pressure Regulation:

ECU monitors rail pressure via sensor

PWM signal (100-1000Hz) adjusts position

Dynamic flow control maintains ±15 bar stability

-Specific Operation:

The modulates fuel entry to the pumping chambers via:

Normally-open design (failsafe position)

Balanced armature solenoid (current range 0.8-1.6A)

0.05mm precision clearance control

 

 

Disconnect battery negative terminal

Relieve fuel system pressure (use service port)

Work in clean, well-ventilated area

Wear protective gloves and eyewear

2. Tools Required

Torque wrench (5-30Nm range)

10mm deep socket

Fuel line disconnect tools

Diagnostic scanner (for system reset)

New sealing washers (copper or aluminum)

3. Removal Procedure

For 29400-1221 (Denso HP3.8 systems):

Locate on pump side (typically front-mounted)

Disconnect electrical connector (press tab firmly)

Remove 10mm mounting bolt (counterclockwise)

Carefully extract with twisting motion

For 04226-0L010 (Bosch CP4.1 systems):

Identify on pump top cover

Unplug 2-pin weatherproof connector

Remove two T20 Torx bolts (8Nm torque)

Lift straight up to avoid seal damage

4. Installation Steps

Clean mounting surface with lint-free cloth

Install new sealing washer (single-use only)

Hand-start mounting bolts to prevent cross-threading

Torque to specification:

29400-1221: 12Nm ±1Nm

04226-0L010: 8Nm ±0.5Nm

Reconnect electrical connector until click

5. Post-Installation Procedures

Prime fuel system (3-5 ignition cycles)

Perform ECU adaptation:

Denso systems: Use TechStream for "Fuel Pump Learn"

Bosch systems: Execute "Rail Pressure Calibration"

Check for leaks at operating pressure

Clear any stored fault codes

 

 

 

 

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