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VDIAGTOOL V500 Pro User Manual

AUTO INTELLIGENT CIRCUIT TESTER BREAKER FINDER TOOL

This manual provides detailed instructions for the VDIAGTOOL V500 Pro, an advanced automotive electrical system circuit tester and breaker finder tool.

Safety Information

To ensure your safety and prevent damage to the device or vehicle, please carefully read and follow all instructions in this manual before use. Always verify proper testing procedures and strictly adhere to the instructions provided. As automotive electrical systems vary, assess potential risks and ensure a safe testing environment. Always observe all safety warnings, use appropriate tools, and disconnect power sources when necessary. Improper operation may result in personal injury, equipment damage, or voided warranty.

Safety messages use standardized signal words to indicate hazard levels and prevent injuries or equipment damage:

  • DANGER: Will result in death or serious injury if ignored. Indicates an immediately life-threatening hazard.
  • WARNING: Could result in death or serious injury if ignored. Indicates a potentially dangerous situation.

This manual covers known safety hazards but cannot anticipate all possible risks. You are responsible for ensuring safe operating conditions and procedures.

DANGER

  • Always ventilate the service area when the engine is running or use a building exhaust removal system if available.
  • Carbon monoxide is odorless and deadly – it can cause loss of consciousness or death.

WARNINGS

  • Always keep a fire extinguisher suitable for gasoline, chemical, and electrical fires nearby.
  • Never operate or observe the tool while driving – distraction can lead to fatal accidents.
  • Keep clothing, hair, hands, tools, and test equipment away from moving or hot engine parts.
  • Perform automotive testing only in a safe, controlled environment.
  • Ensure proper ventilation – exhaust gases are poisonous.
  • Never connect or disconnect test equipment while the ignition is ON or the engine is running.
  • Place wheel chocks in front of drive wheels and never leave the vehicle unattended during testing.
  • Wear ANSI-approved safety eye protection at all times.
  • Exercise extreme caution around ignition coils, distributor caps, spark plugs, and wires – high voltage is present when the engine is running.
  • Before testing, ensure the transmission is in P (Automatic Transmission) or Neutral (Manual Transmission) and the parking brake is engaged.
  • Keep the scan tool clean and dry; avoid contact with oil, water, or grease. Clean only with a mild detergent and soft cloth.
  • Do not modify, disassemble, or expose the tool to extreme temperatures or moisture.
  • This tool is not a substitute for professional diagnostic equipment – use with caution.
  • The manufacturer is not liable for damages caused by misuse, negligence, or unauthorized modifications.

Legal Information

Trademarks

VDIAGTOOL is a registered trademark of Shenzhen VDIAGTOOL Technology Co., Ltd in the United States and other jurisdictions. All other product names mentioned herein may be trademarks of their respective owners.

Copyright Information

© 2017 Shenzhen VDIAGTOOL Technology Co., Ltd. All rights reserved. No reproduction, distribution, or transmission of this manual is permitted without express written authorization from VDIAGTOOL. This prohibition applies to all forms of copying including electronic, mechanical, photocopying, and recording.

Disclaimer & Liability Statement

Product Documentation Notice

All illustrations, specifications, and technical data in this manual are for reference only and subject to change without notice.

For the latest documentation, visit: https://www.vdiagtool.com/support/downloads

Limitation of Liability

VDIAGTOOL expressly disclaims all liability for:

  • Any direct, indirect, incidental, or consequential damages.
  • Loss of profits or business interruption.
  • Product modifications or unauthorized use.

This manual does not:

  • Modify existing purchase/lease agreements.
  • Create additional liabilities for VDIAGTOOL.
  • Constitute additional product warranties.

IMPORTANT: Always consult this manual before operation, with special attention to all safety warnings. VDIAGTOOL reserves the right to modify product specifications at any time.

Product Support & Training Resources

Technical Support

Training Videos

Free product operation videos:

  1. Visit Training Center: https://www.vdiagtool.com/support/training-center
  2. Select Circuit Testers category, then watch model-specific tutorials.

Product Introduction

The VDIAGTOOL V500 Pro Automotive Intelligent Electrical System Circuit Tester Breaker Finder Tool is the newest generation intelligent tool with a 2.36-inch large LCD screen display. It is dedicated to testing all 9V-30V vehicle electrical systems.

The V500 Pro is an upgraded version of the V500, adding a Short Open Circuit Finder. The Short Open Circuit Finder detects and alerts you immediately where a circuit is open. You can quickly and easily locate open circuits, open connections, broken wires, current leaks, and even trace wires. Additionally, you can find intermittent circuit problems by flexing wires or connectors and listening for a change in the receiver tone, allowing you to either perform general tracing or pinpoint the problem location. This professional Short Open Circuit Finder will work on all kinds of circuits with voltages between 6 and 42 volts DC, such as those found in automobiles, trucks, tractors, boats, RVs, etc., thanks to its wide working voltage range.

The screen can be folded up to 90°, which allows you to see real-time data at different screen angles during testing.

1.1 Product Overview

The VDIAGTOOL V500 Pro unit features the following components:

  • 1. Probe Tip: Contact the circuit or component for testing.
  • 2. Front LED Light: Used for lighting in dark working areas.
  • 3. LCD Screen: Displays test results and can be folded up to 90° allowing you to see real-time data at different angles.
  • 4. Red/Green LED Indicator: Positive and Negative indicator light.
  • 5. Key Button Operation: 6-Key navigation for fast operation.
  • 6. Red Positive Wire: Used to deliver current.
  • 7. Auxiliary Ground Lead: Auxiliary clip of ground lead.
  • 8. USB Port: Update via USB connection to PC.
  • 9. Relay Test Port: Connect the relay test cable.
  • 10. Speaker: Buzzer for warning or reminder.
  • 11. Antenna: Receive data.
  • 12. Buzzer: Sound prompt.
  • 13. Sensitivity Controller: Controls sensitivity.
  • 14. Test Button: Press the test button to start testing.
  • 15. Headphone Port: Port for external headphone.
  • 16. Fuse: Protects the device from damage due to overload.
  • 17. Tool Kit Working Mode Switch: Switches working mode.

1.2 Technical Specifications

Product Parameters:

ParameterV500 Pro Circuit TesterV500 Pro Breaker Finder
DisplayLCD DisplayN/A
Voltage Measurement Range0.1V - 100VN/A
Operating Temperature0°C - 50°C (-32°F - 122°F)0°C to 60°C (32°F to 140°F)
Working Environment Temp0°C - 50°C (-32°F - 122°F)N/A
Operating Voltage9V - 30V DC6V - 42V DC
Resistance Measurement Range0KR - 200KRN/A
Storage Temperature-20°C - 70°C (-4°F - 158°F)-40°C to 70°C (-40°F to 185°F)
Power SourceBy Connecting to Car BatteryBy a 9V Battery

Product Dimensions:

  • Main line: OD 7.8mm, Length 6m
  • Extension line: OD 4.5mm, Length 1m
  • USB line: OD 3.5mm, Length 0.5m
  • Clip line: OD 4.5mm, Length 0.4m
  • Relay line: OD 4.0mm, Length 0.5m

Accessories Included:

  • V500 Pro Circuit Tester × 1
  • V500 Pro Breaker Finder × 1
  • Probe Tip × 1
  • Fine Probe Tip × 1
  • Relay Test Cable × 1
  • Alligator Battery Clip × 1
  • Probe Tip Extension Cable × 1
  • Wire Piercing Probe × 2
  • Banana to Banana Plug Test Lead × 2
  • Fuse × 3
  • Type-C Data Cable × 1
  • User Manual × 1

1.3 Keypad Introduction

The VDIAGTOOL V500 Pro features a navigation keypad:

  • ESC button: Returns to the previous screen. For other tests, press ESC button once to exit.
  • OK button: Confirms a selection.
  • Up button: Navigation key or voltage output, numerical adjustment.
  • Left button: Navigation key.
  • Right button: Navigation key.
  • Down button: Navigation key or voltage output, numerical adjustment.

Product Features

The VDIAGTOOL V500 Pro offers several functions: Smart Test, Multimeter, Oscilloscope, 0-5V Power Supply, Component Test, Relay, Injector, and other additional functions.

2.1 Smart Test

This feature includes Voltage Test, Resistance Test, and Positive/Negative Test. It is primarily used for quick testing without switching between different test modes. It can automatically recognize the measured signal and display values of voltage or OHMs.

2.1.1 Voltage Test

When the probe clip (auxiliary ground lead) is connected to the ground wire, the probe will automatically enter the voltage display mode. When a voltage signal is detected on the Probe Tip, it will display the test voltage. For example, 'VCC' indicates the battery supply voltage is 12.14V, and 'VDC' indicates the current test DC voltage value is 12.11V.

2.1.2 Resistance Test

When the probe clip (auxiliary ground lead) is connected to an electrical circuit of resistance and the Probe Tip is connected to the other end of the resistance, the probe will automatically enter the resistance display mode and show the resistance values.

2.1.3 Positive/Negative Test

When the probe detects a voltage deviation of ±0.8v from the power supply, the RED LED lights ON, displaying the voltage values, and the speaker sounds regularly. When the probe detects the negative signal of the power supply, the GREEN LED lights ON, and the speaker sounds regularly.

2.2 Resistance

This feature is mainly used to measure the resistance value of electronic components. Please refer to section 2.1.2 for more details.

2.3 Multimeter

Also known as a volt-ohm-milliammeter, volt-ohmmeter, or VOM, this feature is a measuring instrument capable of measuring multiple electrical properties. The interface includes functional areas at the bottom for Voltage (V), Resistance (Ω), Diode (DIO), Current (A), Frequency (Hz), and Polarity (P-N). You can press the 'Left' or 'Right' buttons to select the test mode.

  • Voltage (VDC): Connect the probe clip (auxiliary ground lead) to the negative pole and the probe tip to the measured voltage.
  • Resistance (OHM): Connect the probe clip (auxiliary ground lead) to one side of the resistance being measured, and the probe tip to the other side.
  • Diode (DIO): Connect the probe clip (auxiliary ground lead) to one side of the diode being measured, and the probe tip to the other side. It will display the voltage and show the diode's positive and negative polarity.
  • Current (AMP): The probe is connected in series in the circuit under test; it will display the current value.
  • Frequency (HZ): Displays the frequency of the measured signal and duty cycle value.
  • Polarity: Displays whether the current measured line is positive or negative.

NOTE: When testing current, ensure wires are in series connection, not parallel. Parallel connection may trigger overload protection and restart the device. For questions, contact support@vdiagtool.com.

2.4 Oscilloscope

This feature is an electronic test instrument that displays electrical signals graphically, typically as Voltage (vertical or Y axis) versus Time (transverse or X axis). This function can be displayed in a vertical or transverse screen. The display shows voltage on the Y axis from 0.0V to 10.0V and time on the X axis from 1ms to 500ms. The 'OK' button can be used to pause or run waveform refresh.

2.5 0-5V Power Supply

This feature provides a regulated and stable 0-5V DC (direct current) output voltage. This low-voltage power supply is commonly used to power electronic devices requiring a 0-5V DC supply, including micro-controllers, sensors, LED lights, USB charging devices, and other low-power electronic components. The display shows 'Output Voltage' and 'Set Value', with options to adjust by ±0.1V or ±1.0V.

NOTE: The 0-5V Power Supply is designed as an active mode, different from Component Activation. It can adjust voltage output under 5V and limit current to 100mA, preventing burnout of electric components.

2.6 Component Test

This feature verifies the input/output behavior of the test object, ensuring its functionality works correctly and completely as per the desired specification. This type of testing focuses on performing separate tests on each component. The device displays VDC, AMP, and VCC values during testing.

The device offers three activation modes:

  • "MOMENT" Mode: Press 'Left' or 'Right' to select. Press and hold 'UP' or 'Down' to perform power supply; release to stop.
  • "LATCH" Mode: Press 'UP' or 'Down' to perform power supply; press 'UP' or 'Down' again to stop.
  • "PULSE" Mode: Press and hold 'UP' or 'Down' to perform power supply; release to stop.
  • "SETTING" Circuit Breaker: Press 'UP' or 'Down' to adjust overload current values from 1A - 18A.

2.7 Relay

This feature allows for the review of protective devices in a system. Protective devices and periodic reviews are crucial for the safe operation of power supply networks. The protective relay test refers to the protective relay, and its proper operation must be monitored throughout its life. When the relay is not connected, the interface displays 'Relay not on'.

The 'VCC' display shows the power supply voltage. The interface displays two types of common automotive relay diagrams (4-terminal and 5-terminal). Press the 'UP' button to start the test and the 'OK' button to view wiring connection diagrams for these relays.

2.8 Injector

This feature uses the probe tip to output different pulse signals to the injector and check its spraying status, aiding in diagnosing injector conditions. There are 4 Signal Output Modes:

  • Mode 1: Outputs 1 pulse with a positive pulse width of 250ms.
  • Mode 2: Outputs 7ms positive, then 20ms negative, with a cycle of 1.4s.
  • Mode 3: Outputs 4ms positive, then 10ms negative, with a cycle of 1.4s.
  • Mode 4: Continuously outputs positive for 7ms, then negative for 20ms. Press 'ESC' to stop.

Injector Test Procedure:

  1. Turn off the vehicle's engine.
  2. Connect the BLACK clip to the negative terminal of the battery and the RED clip to the positive terminal.
  3. Unplug the connector from the fuel injector. Connect the probe auxiliary ground lead to the negative side of the injector and the probe tip to the positive side.
  4. Enter the Injector Test function and select the test mode.
  5. Press 'OK' to trigger the test.
  6. Check the injector spraying status to diagnose the condition.

2.9 Locating Circuit Breaker Point, Open Connections, Broken Wires, Current Leaks

The V500 Pro can easily locate circuit breaker points, open connections, broken wires, and current leaks by detecting tone changes. It can also trace wires/cables without damaging insulation. For more details, refer to section 6, 'Locating Open Circuit'.

Setting

3.1 Language

There are nine languages to choose from: English, Simplified Chinese, French, Spanish, German, Russian, Italian, Portuguese, and Polish.

3.2 Floodlight

This option allows you to turn the device's headlight on or off.

3.3 Voice

This option allows you to turn the device's sound on or off.

3.4 Self Test

3.4.1 LCD Test

When entering this test, the screen displays different colors to check if the screen is functioning normally and if there are any black spots. Pressing the ESC key will exit the test directly, indicating the ESC key is working properly.

3.4.2 Key Test

When entering this test, the screen displays the buttons. Press the corresponding button, and its symbol on the screen will flash once. Pressing [ESC] twice exits the test.

3.4.3 Led Test

When entering this test, the Floodlight on the head of the device and the positive and negative LED lights at the button position will remain on, indicating that the device lights are functioning correctly.

3.5 Display Mode

Here you can choose whether the device operates in Light mode or Dark mode.

3.6 Update

To update the device software, hold down the 'Down' key and power on the device. The device will display 'USB mode', allowing you to use the computer software to upgrade it. The update process involves connecting the device to a computer via USB cable after entering the upgrade mode.

3.7 About

This section displays information about the device:

  • Brand: VDIAGTOOL
  • Model: V500 Pro
  • Software Version: V24.0
  • Hardware Version: V1.0
  • Email: support@vdiagtool.com
  • Website: www.vdiagtool.com

Test Applications

4.1 Continuity Test

A continuity test is a quick check to determine if a circuit is open or closed. Only a closed, complete circuit has continuity. During a continuity test, a digital multimeter sends a small current through the circuit to measure resistance. When the device is in 'Multimeter' mode, select the resistance test function. Using the probe tip with chassis ground or the auxiliary ground lead, continuity can be tested on wires and components attached or disconnected from the vehicle's electrical system.

When the probe contacts a good ground, the LCD screen will display '0.0Ω', and the green LED indicator will light up. If sound is enabled in settings, the buzzer will beep simultaneously.

In other cases, the LCD screen will display the resistance value. If the resistance is greater than 200 KΩ, the LCD screen will display 'OL'. An alternative continuity verification involves supplying power to the electrical system in Component Activation mode; if the circuit breaker trips, it indicates a good connection with low resistance.

NOTE: Do not perform tests on ECU modules or SRS (airbag) systems before they are completely disabled or unplugged. You can use the probe tip to pierce plastic insulation on a wire to run a test.

4.2 Signal Circuit Test (Oscilloscope Test)

When troubleshooting a sensor circuit after extracting a DTC (Diagnostic Trouble Code), this quick test verifies the code. For example, to test a suspected M.A.P. sensor circuit:

  1. Enter Oscilloscope mode and use the probe tip with chassis ground or auxiliary ground lead.
  2. Connect a vacuum pump to the M.A.P. sensor.
  3. Touch the probe tip to the positive terminal of the M.A.P. sensor and observe the LCD screen. A sine waveform in good condition is expected.
  4. Apply vacuum from the pump and observe the reading on the LCD screen.

If the waveform reading is abnormal, there is a problem with the sensor.

4.3 Activating Components in Your Hand

While the circuit probe is in DC voltage mode, using the probe tip in connection with the auxiliary ground lead allows components to be activated directly, thereby testing their functions. For example, to test a bulb's working condition:

  1. Hook up the battery clip to the power supply.
  2. Enter 'Active' mode and select the 'MOMENT' function.
  3. Connect the auxiliary ground lead to the negative terminal of the component being tested, and the probe tip to the positive terminal. Press the 'UP' button to trigger the activation test.
  4. The LCD screen will display the values of VDC, AMP, and VCC.

If the probe circuit breaker trips, it indicates the probe is overloaded, possibly due to probing a direct ground or negative voltage, a short-circuited component, or a very high current component (e.g., starter motor).

4.4 Activating Components in Vehicle

Importance: The activation mode is designed for supply powers or ground and should not be used on sensitive electronics (like ECU or sensor modules) to avoid component burnout. Do not perform tests on ECU modules or SRS (airbag) systems before they are completely disabled or unplugged. Supplying power to the electrical system can damage sensitive electronic components; always refer to the vehicle manufacturer's schematic diagram and diagnostic process.

Test Procedure:

  1. Hook up the battery clip to the power supply.
  2. Enter 'Active' mode and select the 'MOMENT' function.
  3. Connect the auxiliary ground lead to the negative terminal of the component being tested, and the probe tip to the positive terminal. Press the 'UP' button to trigger the activation test.
  4. The LCD screen will display the values of VDC, AMP, and VCC.

If the probe circuit breaker trips or the 'OVERLOADED' message appears on the LCD screen, adjust the overload current value and repeat the operation for further activation. To avoid component burnout, refer to the component's specifications and parameters to set the OVERLOAD CURRENT VALUE.

4.5 Activating Components w/Ground

Test Procedure:

  1. Hook up the battery clip to the power supply.
  2. Enter 'Active' mode and select the 'MOMENT' function.
  3. Connect the auxiliary ground lead to the negative terminal of the component being tested.
  4. Connect the probe tip to the positive terminal of the component, press the 'DOWN' button to trigger the activation test.
  5. The LCD screen will display the values of VDC, AMP, and VCC.

If the probe circuit breaker trips, it means the probe is overloaded, which could happen if the contact is a direct ground or negative voltage, the component is short-circuited, or it's a very high current component (e.g., starter motor). If you contact a protected circuit and apply ground, the vehicle fuse may burn out or the probe may trip.

4.6 Checking for Bad Ground Contacts

Probe the suspected ground wire or contact with the probe tip.

Test Procedure:

  1. Enter 'Active' mode, select 'MOMENT' function, and set the overload current to 1A.
  2. Connect the probe tip to a suspected wire.
  3. Press the 'OK' button to trigger the power supply.

The RED LED light will turn ON, and the LCD screen will display VDC, AMP, and VCC values. If the VDC value is almost the same as VCC and the AMP value is close to 0A, it indicates it is not a true ground. Otherwise, if the probe circuit breaker trips or displays 'OVERLOADED', it is more likely a good ground. Keep in mind that high current components, such as starter motors, will also trip the circuit breaker.

4.7 Following & Locating Short Circuits

A short circuit typically appears when a fuse or fusible link blows, or an electrical protection device (like a circuit breaker) trips. This is the best place to begin the search.

Test Procedure:

  1. Remove the blown fuse from the fuse box.
  2. Use the probe tip to activate and energize each of the fuse contacts.
  3. The contact that trips the circuit breaker indicates the shorted circuit. Note this wire's identification code or color.
  4. Follow the wire as far as possible along the wiring harness.

Example Application: If following a short in the brake light circuit, locate the color-coded wire in the harness at the door sill and expose it. While in the Active interface, select MOMENT mode. Use the probe tip to contact the marked wire and press the 'UP' button to trigger power supply. If the circuit breaker trips, you have verified the shorted wire. Cut the wire and energize each end with the probe tip; the end that trips the circuit breaker again is the shorted circuit, leading you to the shorted area. Follow the wire in the shorted direction and repeat this process until the short is located.

4.8 Trailer Lights and Connection Test

When the probe is in Multimeter or SMART test mode, connect the probe auxiliary ground lead to the trailer light and insert the probe tip into the OBD socket to display the current voltage. This method allows you to check the function and direction of the connector and trailer lights. If the trailer light connection is correct, use the 'Component Activation' function to test whether the trailer light is working.

Short Open Circuit Finder Knowledge

Q: Is Short Open Circuit Finder computer and air bag safe?

A: The Short Open Circuit Finder LED and LCD draw no more than 1 milliamp of current, making it computer and airbag safe when used as a test light or multimeter. However, pressing the power switch is different. When you press the switch forward, you conduct full battery current to the probe tip. A safety feature is built-in: connect the extra ground lead to the Short Open Circuit Finder and press the power switch forward until it trips the circuit breaker. This prevents power from going to the tip but allows the tool to be used as a multimeter. When away from computer components, press the reset button to power up again.

Locating Open Circuit

6.1 How to use the Breaker Finder

The breaker finder's probe is made of coiled steel and can be bent as needed to reach wires in congested or difficult areas. Depending on the circuit characteristics and sensitivity settings, the probe will pick up the signal from the wire in various positions. For the best range, the Breaker Finder's probe tip (black cap) should be positioned perpendicular (at 90°) to the wire being traced, either above or below it.

CORRECT: Probe tip perpendicular to the wire.

INCORRECT: Probe tip not perpendicular to the wire.

6.2 Setting Sensitivity Level

To increase sensitivity, turn the rotary switch of the circuit breaker finder clockwise. To decrease sensitivity, turn the rotary switch anticlockwise.

6.3 Breaker Finder Operation Guide

With the probe kit connected to power, select Mode II on the tool kit working mode switch button. Switch on the Short Open Circuit Finder and set the rotary switch to the middle position. Press and hold the TEST button, and move the black probe tip along the wire you want to test. The finder detects the signal and sounds the loudspeaker, indicating the unit is working correctly.

Connect the black test lead to the negative supply (ground) and the red test lead to the positive supply (or a fuse socket/connector for convenience). Switch on the finder probe, set its rotary switch to the middle position, press and hold the TEST button, and slowly sweep the wire with the probe point above or below perpendicularly and as close as possible. Check at different points to narrow down the area or trace the wire along, moving towards the load. Observe the tone signal; where the tone signal stops is the location of the open, break, or bad connection. If it's difficult to pick up a tone signal, try increasing sensitivity by turning the rotary switch clockwise and testing again. When finished, disconnect the test leads and release the TEST button.

Warranty

Limited Three Years Warranty

VDIAGTOOL warrants the V500 Pro product against defects in materials and workmanship for thirty-six (36) months from the date of delivery to the original purchaser for commercial or business use. This warranty does not cover damage resulting from misuse, unauthorized modification, improper maintenance, or operation outside specified conditions. VDIAGTOOL's sole liability shall be limited to repair or replacement of defective components at its discretion. Consequential, incidental, or other damages are expressly excluded. Some jurisdictions may not permit certain limitations of liability.

Contact Us

Warranty & Support

  • Email: support@vdiagtool.com
  • Website: www.vdiagtool.com

For wholesale business or to become distributors:

  • Email: sales@vdiagtool.com

Invent with us, test products before they hit market, help us make better products for everyone:

  • Email: inventers@vdiagtool.com

Create social media content, post online and help our community:

  • Email: marketing@vdiagtool.com

Follow Us on Social Media

  • Facebook Page: Search for "vdiagtool"
  • Facebook User Group: Search for "VDIAGTOOL OFFICIAL User Group"
  • Instagram: Search for "vdiagtool_official"
  • TikTok: Search for "vdiagtool_us"
  • YouTube: Search for "Vdiagtool Official"
Models: V500_PRO, V500 Pro Automotive Circuit Tester, V500 Pro, Automotive Circuit Tester, Circuit Tester, Tester

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References

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