Yuchai Engine Rotational Speed Sensor Compatible with Yuchai

1. Product Overview & Wholesale Price Range

The Rotational Speed Sensor collects engine rotation speed signal, feeding real-time speed data to the engine ECU to adjust fuel injection for Yuchai engine.

• Factory Wholesale Price: $9 – $48 USD (Direct manufacturer pricing — Save up to 50% vs regional dealer markups)
• Sensor Type: Engine Rotational Speed Sensor
• MPN: Rotational Speed Sensor
• MOQ & Bulk Discount: 1 Unit (Tiered wholesale discounts available for repair shop & distributor batch orders)
• Lead Time: 1–3 business days (Large factory stock ready for immediate worldwide dispatch)
• Warranty: 12 Months full replacement warranty with signal output test guarantee

2. Application Worksite Checklist

Engineered with corrosion-resistant brass body and sealed sensor core to withstand harsh engine compartment conditions:

• Engine Speed Monitoring: Provides accurate rotational speed signal to ECU for fuel injection adjustment.
• Heavy Earthmoving & Quarry Operations: Brass housing resists coolant corrosion, dust and vibration under continuous heavy-load operation.
• Long-Hour Mining & Loading Work: Stable speed reading prevents engine fault codes during multi-shift operation.
• Engine Protection Control: Reliable speed signal helps ECU limit over-speed and protect engine parts.

3. Rotational Speed Sensor Troubleshooting & Diagnostic Guide

If your machinery with Yuchai engine is exhibiting sensor-related failure, consult the diagnostic guide below:

• Fault 1: No Engine RPM Reading on Dashboard
  Root Cause: Failed or intermittent rotational speed sensor — ECU receives no rotation speed signal.
  Solution: Replace with a new rotational speed sensor and inspect wiring harness and connector pins.
• Fault 2: Engine Power Loss & Unstable Running
  Root Cause: Incorrect speed signal makes ECU misjudge engine working status.
  Solution: Install a new rotational speed sensor and check wiring connector.
• Fault 3: ECU Speed Related Fault Code
  Root Cause: Open circuit, short circuit or corroded sensor connector.
  Solution: Replace rotational speed sensor and clean connector terminals; clear DTC with diagnostic scanner.
• Fault 4: Engine Hard To Start
  Root Cause: Missing speed signal leads ECU to stop fuel supply during cranking.
  Solution: Replace the rotational speed sensor before pursuing expensive fuel system repairs.
• Fault 5: Oil Leakage at Sensor Thread
  Root Cause: Damaged thread or failed sealing washer on sensor.
  Solution: Replace sensor with new sealing washer; apply proper thread sealant during installation.

4. Hot Machinery Replacement Parts Recommendation

Explore our factory-direct replacement components compatible with major global excavator brands:

5. Frequently Asked Questions & Technical Support

Q1: How do I verify if this rotational speed sensor fits my Yuchai engine?
A: Check your original sensor thread size and connector type, confirm your machine equipped with Yuchai engine. Send machine serial number to us for quick fitment check.

Q2: What is the working principle of this rotational speed sensor?
A: This magnetic pickup speed sensor. It generates pulse signals according to gear rotation, converting rotation speed into electrical signals for the engine ECU.

Q3: What should I note during sensor installation?
A: Use a new sealing washer, apply suitable thread sealant, do not over-tighten the brass thread. Check signal connection after installation.

Q4: Does this rotational speed sensor come with the sealing washer?
A: Yes, each sensor comes with matched sealing washer, ready for direct installation on the engine.