Vemo V38720019 Impulse Generator/Crankshaft

Vemo V38720019 Impulse Generator / Crankshaft

The Vemo V38720019 is a high‑performance crankshaft pulse sensor designed for use in modern internal combustion engines. It delivers precise angular position data to the engine control unit (ECU), enabling accurate fuel injection, ignition timing, and variable valve timing control.

Key Functionalities

• Hall Effect Technology: Utilises a non‑contact magnetic sensor that generates electrical pulses as the crankshaft passes by. This ensures reliable operation even under high vibration and temperature conditions.
• Dual‑Channel Output: Provides two independent pulse signals (A & B) for redundancy and improved resolution of engine speed and position.
• High Pulse Frequency: Capable of producing up to 10,000 pulses per revolution, allowing the ECU to calculate crankshaft speed with sub‑millisecond accuracy.
• Compact Design: Small footprint (approx. 30 mm × 20 mm) and lightweight construction make it ideal for tight engine bay spaces.

Compatibility Overview

The Vemo V38720019 is engineered to fit a wide range of Nissan, Infiniti, and Renault vehicles that use the V38‑72‑0019 series. Common models include:

• Nissan Micra III (K12), Almera Primera, Sentra, Titan, and 350Z
• Infiniti FX, Q45, Tino, Note, Titan, Sunny II, Marcin II
• Renault Truck platforms that employ the same crankshaft sensor architecture.

Each vehicle’s engine bay layout may require a specific mounting orientation; however, the sensor’s standardized connector and mounting flange accommodate most OEM configurations.

Electrical Characteristics

Installation Guide

1. Remove the Old Sensor: Disconnect the electrical connector, unscrew the mounting bolts, and carefully detach the sensor from the crankshaft pulley or camshaft gear.
2. Prepare the Mounting Surface: Clean any debris or oil residue to ensure a solid mechanical bond. If necessary, apply a thin layer of high‑temperature silicone sealant for vibration damping.
3. Align the Sensor: Position the Vemo V38720019 so that its magnetic core faces the crankshaft’s magnetic field source (usually a permanent magnet on the gear).
4. Screw in Place: Tighten the mounting bolts to the manufacturer’s torque specification (typically 15 Nm). Verify that the sensor is firmly seated and free of play.
5. Reconnect Wiring: Attach the connector, ensuring correct polarity. Inspect for any loose or damaged wires.
6. Test Functionality: Start the engine and observe the ECU’s diagnostic readout. The sensor should register a steady pulse train corresponding to engine speed. If irregularities appear, double‑check alignment and wiring.

Performance Benefits

• Enhanced Fuel Efficiency: Precise crankshaft timing allows the ECU to optimize fuel injection events, reducing consumption by up to 2% in some configurations.
• Improved Emission Control: Accurate sensor data supports tighter control of combustion parameters, lowering NOx and CO₂ outputs.
• Reduced Engine Wear: Consistent timing reduces mechanical stress on pistons and valves, extending engine life.
• Robustness in Extreme Conditions: The Hall effect design resists magnetic interference and electrical noise common in high‑performance or heavy‑duty engines.

Maintenance Tips

Although the Vemo V38720019 is designed for long life, periodic checks can preempt failures:

• Inspect the connector pins for corrosion; clean with contact cleaner if necessary.
• Verify mounting torque every 10,000 miles or after any major engine work.
• Avoid exposure to extreme static charges by handling the sensor with anti‑static gloves.

Technical Support and Resources

For detailed wiring diagrams, firmware updates, or troubleshooting guides, consult the official Vemo technical documentation. The manufacturer provides a comprehensive service manual that includes:

• Pinout schematics for all supported vehicle models.
• Diagnostic trouble codes (DTCs) related to crankshaft pulse sensor failures.
• Recommended torque specifications and installation tolerances.

Conclusion

The Vemo V38720019 Impulse Generator / Crankshaft is a reliable, high‑precision component essential for modern engine management systems. Its Hall effect design, dual‑channel output, and broad compatibility make it an excellent choice for both OEM replacements and aftermarket upgrades across a wide range of Nissan, Infiniti, and Renault vehicles.