Bosch 0414693004 – The CP1 Pump With Optimised Suction Control Valve Response For Transient Fuel Delivery

In a common-rail diesel engine, the high-pressure pump must respond quickly to changes in the fuel demand-when the driver accelerates, the pump must deliver more fuel within milliseconds. The pump's response is determined by the suction control valve-the valve that regulates the fuel flow into the plungers. If the valve is slow, the pump cannot deliver the required fuel quantity, and the engine hesitates. The 0414693004 is a Bosch CP1 pump that is designed with an optimised suction control valve response that delivers the required fuel quantity within 50 ms of a change in demand-the valve has a low-mass armature that moves quickly, and the spring force is matched to the engine's speed range. It is the pump that responds instantly to the driver's command, so the engine delivers the power when it is needed.

The suction control valve is a solenoid-operated valve that regulates the fuel flow into the plungers. The valve is controlled by the ECU-the ECU sends a PWM signal to the valve, and the valve opens or closes to regulate the fuel flow. The valve's response time-the time between the ECU command and the valve's response-determines the pump's transient response. If the valve is slow, the fuel quantity is delayed, and the engine hesitates. The 0414693004 addresses this with an optimised SCV response that delivers the required fuel quantity within 50 ms-the SCV has a low-mass armature that is 20 % lighter than the standard armature, and the spring force is matched to the engine's speed range.

The 0414693004 is a direct replacement for the original CP1 pump used in Bosch common-rail systems, commonly found in:

BMW – 3.0 diesel (M57, N57) – 3er, 5er, 7er, X5, X6

Volkswagen Group – 2.5 TDI, 3.0 TDI – Audi, VW, Seat, Skoda

Mercedes-Benz – OM612, OM647, OM648 – C-Class, E-Class, ML, Sprinter

Jeep – Grand Cherokee 3.0 CRD

Ford – Transit 2.4 TDCi

Land Rover – Discovery 3, Range Rover Sport – 2.7 TDV6

Jaguar – S-Type, XJ – 2.7 diesel

Peugeot – 607, 807 – 2.2 HDi

Citroën – C5, C8 – 2.2 HDi

Cross-references include Bosch 0414693004 and the original OEM pump used in the CP1 systems listed above. The pump is designed for the 12 V electrical system used in these engines.

The 0414693004 uses an SCV with a low-mass armature that is 20 % lighter than the standard armature-the lower mass reduces the armature's inertia, and the armature moves more quickly. The spring force is matched to the engine's speed range-the spring is selected to provide a force that is proportional to the engine speed, and the SCV response is consistent across the engine speed range. The SCV response is verified on each pump using a current probe and a pressure transducer.

The most common failure is a sticky SCV armature-the armature sticks in the bore, and the valve does not respond. The symptom is a hesitation on acceleration and a loss of power.

Q1: How can I tell if my SCV response is slow? → The engine hesitates on acceleration, and the rail pressure is slow to rise.

Q2: Can I use a standard CP1 pump as a replacement? → A standard pump may not have the optimised SCV response.

Q3: Why does my engine hesitate on acceleration? → The SCV may be slow-the armature mass is too high.

Q4: What is the most common cause of pump failure? → A sticky SCV armature-the armature sticks in the bore.

Q5: Does the pump work with biodiesel? → Yes, but biodiesel can affect the SCV's lubrication.

Q6: What is the warranty on the pump? → The pump has a 12-month warranty.

 

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