I. Core Parameters and Specifications

Manufacturer Part Number: 320-3063 (3203063, CA3203063)

Replacement Models: 349-7374, 320-3060, 320-3061

Official Name: Low Pressure Sensor / Fuel Pressure Sensor

Type: Piezoresistive (Active), 5V Powered, Analog Voltage Output

Core Applications:

Monitors fuel common rail low-pressure side (located after the transfer pump, before the high-pressure pump)

Monitors engine oil pressure, intake air pressure, and atmospheric pressure

Used for fuel system pressure protection, fuel injection control, and fault diagnostics

Electrical Characteristics:

3-Pin Waterproof Connector (5V Power Supply, Signal Output, Ground)

Power Supply: 5V DC ±0.25V

Output: 0.5–4.5V Analog Signal (Linear correspondence to pressure)

Operating Voltage: 12–24V DC (Compatible with vehicle electrical systems)

Mechanical Parameters:

Mounting Thread: M12×1.5 (Standard pressure sensor interface)

Housing Material: Alloy Brass

Operating Temperature: -40°C to 125°C

Protection Rating: IP67 (Waterproof and Dustproof)

Weight: ≈0.1 kg

Pressure Range (Core):

Measurement Range: 0–600 kPa (0–6 bar) (Dedicated for low-pressure applications)

Accuracy: ±0.5% FS (Full Scale)

Response Time: <10 ms

II. Compatible Engines (Full Series Coverage)

C4.4, C7.1, C9.3, C13, C15, C18, C27, C32

3508, 3512B/C/E, 3516B/C/E, 3520C/E

Perkins Series (Shares platform with C4.4/C7.1)

III. Compatible Equipment (Mainstream Models)

Excavators 312E/313E/314E/320E/323E/330E/330F/336E/349E

M314F/M315F/M320F Wheeled Excavators

Wheel Loaders

910M/914M/918M/924K/926M/930K/M/938K/M

950K/L/M/962K/L/M/966K/L/M/972K/L/M/980K/L

Other Equipment

Mining Trucks, Dozers, Generator Sets (XQ350/XQ375/XQC1200)

IV. Fault Manifestations and Diagnostics

Typical Fault Symptoms

Difficulty starting the engine, unstable idle speed, lack of power during acceleration

ECM reports fault codes: P0087 (Rail pressure too low), P0088 (Rail pressure too high), P0236 (Pressure sensor fault)

Abnormal fuel system pressure, accelerated wear of the high-pressure pump

Sensor signal drift, short circuits, or open circuits, leading to ECM torque limitation or engine shutdown

Quick Inspection Steps

Voltage Test:

Power Supply: Measure the power supply pin on the 3-pin connector; it should be 5V ± 0.2V.

Signal: 0.5–1.0V at idle; 3.5–4.5V at full load (linear variation).

Resistance Test: Internal resistance should be 450–800Ω at normal ambient temperature; replace the component if abnormal.

Pressure Verification: Use a pressure gauge to cross-check the sensor output; if the deviation is **> ±5%**, the sensor requires replacement or calibration.

Substitution Test: Replace the component with a 349-7374 or 320-3060 unit to verify if the fault is resolved.

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