1. Product Overview
The MagiDeal Automotive Sensor Signal Simulator MNB-3 is a versatile tool designed for professionals in automotive repair and maintenance. This device allows for the simulation of various sensor signals, enabling technicians to diagnose and troubleshoot vehicle electronic systems efficiently without needing the actual sensor to be present or functional.
It is capable of simulating voltage changes, air flow, intake air pressure, oil pressure, and a range of temperature sensors, including coolant, intake air, oil, fuel, ambient, and evaporator temperature sensors. Constructed from durable PP (Polypropylene) material, the MNB-3 ensures longevity and reliable performance in a workshop environment.

Figure 1.1: The MagiDeal MNB-3 Automotive Sensor Signal Simulator, showing the main unit, a 9V battery connector cable, and four alligator clip test leads (red, black, red, yellow).
2. Setup and Connections
Before operating the MNB-3 simulator, ensure proper setup and secure connections.
2.1 Power Supply
The MNB-3 is powered by a standard 9V battery. Connect the provided 9V battery connector cable to the battery terminals and then to the power input port on the simulator unit.
2.2 Connecting to Vehicle/Sensors
Use the included alligator clip test leads to connect the simulator to the vehicle's wiring harness or directly to sensor inputs. The simulator features output terminals for V1, V2, O2S signal, and R signal, along with a common ground (GND) terminal.
- V1/V2 Output: For simulating voltage signals.
- O2S Signal Output: For simulating oxygen sensor signals.
- R Signal Output: For simulating resistance-based sensor signals.
- GND: Common ground connection.

Figure 2.1: Detailed view of the MNB-3 control panel, highlighting the V1, V2, O2S, and R signal output knobs, digital displays, and connection points for test leads.
3. Operating Instructions
The MNB-3 simulator provides intuitive controls for generating various automotive sensor signals.
3.1 Voltage Signal Simulation (V1 & V2)
The device features two independent voltage signal outputs, V1 and V2, each controlled by a dedicated rotary knob. These outputs simulate voltage changes from sensors such as air flow sensors, intake air pressure sensors, and oil pressure sensors.
- Rotate the V1 knob to adjust the output voltage for V1.
- Rotate the V2 knob to adjust the output voltage for V2.
- The ratio between V1 and V2 voltage signals is adjustable, allowing for precise simulation of complex sensor behaviors.
3.2 Oxygen Sensor (O2S) Signal Simulation
The O2S signal output simulates the voltage fluctuations characteristic of an oxygen sensor. This is crucial for diagnosing engine management systems related to fuel mixture control.
- Rotate the O2S signal knob to adjust the characteristics of the simulated oxygen sensor signal.
3.3 Resistance Signal Simulation (R Signal)
The R signal output simulates changes in resistance, which is common for many temperature sensors in a vehicle. This includes:
- Coolant temperature sensors
- Intake air temperature sensors
- Oil temperature sensors
- Fuel temperature sensors
- Ambient temperature sensors
- Evaporator temperature sensors
- Rotate the R signal knob to simulate varying resistance values.
4. Maintenance
To ensure the longevity and optimal performance of your MagiDeal MNB-3 simulator, follow these maintenance guidelines:
- Cleaning: Wipe the unit with a soft, dry cloth. Avoid using abrasive cleaners or solvents that could damage the plastic casing or electronic components.
- Storage: Store the device in a cool, dry place away from direct sunlight and extreme temperatures.
- Battery: Remove the 9V battery if the device will not be used for an extended period to prevent battery leakage and potential damage to the unit.
- Handling: The simulator is made of durable PP material, but avoid dropping or subjecting it to severe impacts.
5. Troubleshooting
If you encounter issues while using the MNB-3 simulator, refer to the following common troubleshooting steps:
- Device Not Powering On:
- Ensure the 9V battery is properly connected and has sufficient charge. Replace the battery if necessary.
- Check the battery connector for any damage or loose connections.
- Incorrect Signal Output:
- Verify that the test leads are securely connected to the correct output terminals on the simulator and the input points on the vehicle's system.
- Ensure the respective rotary knobs (V1, V2, O2S, R) are adjusted to the desired settings.
- Confirm that the vehicle's system is correctly configured to receive the simulated signal.
- Intermittent Signal:
- Check all connections for looseness or corrosion.
- Ensure the battery connection is stable.
If problems persist, contact MagiDeal customer support for further assistance.
6. Specifications
| Feature | Detail |
|---|---|
| Model | MNB-3 |
| Brand | MagiDeal |
| Material | PP (Polypropylene) |
| Dimensions (L x W) | 15 cm x 9.5 cm (approximately 6 x 3.7 inches) |
| Power Supply | 9V Battery (not included) |
| ASIN | B0DB5BN2WP |
| First Available Date | July 25, 2024 |

Figure 6.1: Dimensions of the MNB-3 simulator, showing a length of 15 cm and a width of 9.5 cm.
7. Warranty and Support
For warranty information or technical support regarding your MagiDeal Automotive Sensor Signal Simulator MNB-3, please refer to the purchase documentation or contact MagiDeal customer service directly. Keep your proof of purchase for any warranty claims.
For general inquiries or assistance, you may visit the official MagiDeal website or contact their support channels.





