VDIAGTOOL V500 Pro Automotive Intelligent Circuit Tester Breaker Finder Tool User Manual

Legal Information

Trademarks

VDIAGTOOL is a trademark, registered in the United States and other countries, of Shenzhen vdiagtool Technology Co., Ltd. This publication contains Shenzhen vdiagtool Technology Co., Ltd trademarks, including but not limited to VDIAGTOOL. All other marks are trademarks or registered trademarks of their respective holders.

Copyright Information

No part of this manual may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise without the prior written permission of VDIAGTOOL. © 2017 Shenzhen vdiagtool Technology Co., Ltd. All rights reserved.

Disclaimer of Warranties and Limitation of Liabilities

All pictures and illustrations shown are for reference purposes only. All information, specifications and illustrations in this manual are based on the latest information available at the time of printing and are subject to change without notice. While the authors have taken due care in the preparation of this manual, nothing contained herein:

• Modifies or alters in any way the standard terms and conditions of the purchase, lease, or rental agreement under the terms of which the equipment to which this manual relates was acquired.
• Increases in any way the liability to the customer or to third parties.

VDIAGTOOL will not be liable for any direct, special, incidental, indirect damages or any economic consequential damages (including the loss of profits). VDIAGTOOL reserves the right to make changes at any time without notice.

IMPORTANT:

Before operating or maintaining this unit, please read this manual carefully paying extra attention to the safety warnings and precautions.

Product Support Information

Technical Assistance Website: www.vdiagtool.com

E-Mail: support@vdiagtool.com

Phone: 1-213-355-7171 (United States)

Online contact form: https://www.vdiagtool.com/tech?id=7Manuals/Technical Documentation

This manual is periodically revised to ensure the latest information is included.

Download the latest version of this manual and other related technical documentation at: https://www.vdiagtool.com/Downloads?id=15

Safety Message ⚠️

To prevent personal injury or damage to vehicles or the V500 Pro, please read this user manual carefully and observe the following safety precautions at a minimum whenever working on a vehicle:

• Keep a fire extinguisher suitable for gasoline/ chemical/ electrical fires nearby.
• Do not attempt to operate or observe the tool while driving a vehicle, operating or observing the tool will cause driver distraction and could cause a fatal accident.
• Keep clothing, hair, hands, tools, test equipment, etc. away from all moving or hot engine parts.
• Always perform automotive testing in a safe environment.
• Operate the vehicle in a well-ventilated work area. Exhaust gases are poisonous.
• Do not connect or disconnect any test equipment while the ignition is ON or the engine is running.
• Put blocks in front of the drive wheels and never leave the vehicle unattended while running tests.
• Wear safety eye protection that meets ANSI standards.
• Use extreme caution when working around the ignition coil, distributor cap, ignition wires and spark plugs. These components create hazardous voltages when the engine is running.
• Put the transmission in P(for A/T) or N(M/T) and make sure the parking brake is engaged.
• Keep the scan tool dry, clean free from oil/ water or grease. Use a mild detergent on a clean cloth to clean the outside of the scan tool when necessary.
• Our company is not responsible for any damage caused by unintentional or deliberate misuse of our products or tools.

1. Product Introduction

1.1 Product Introduction

VDIAGTOOL V500 Pro Automotive Intelligent Electrical System Circuit Tester Breaker Finder Tool is the newest generation intelligent Tool with 2.36 inch large size LCD screen display. It is dedicated to test all 9V-30V vehicle electrical systems. V500 Pro is Convenient, Fast and Intelligent!

The V500 Pro is an upgraded version of V500, adding 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.

1.2 Product Overview

The VDIAGTOOL V500 Pro features several 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° to allow viewing 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: For updating via USB connection to PC.
• 9. Relay Test Port: Connects the relay test cable.
• 10. Speaker: Buzzer for warning or reminders.
• 11. Antenna: Receives data.
• 12. Buzzer: Provides sound prompts.
• 13. Sensitivity Controller: Controls sensitivity.
• 14. Test Button: Press to start testing.
• 15. Headphone Port: Port for external headphones.
• 16. Fuse: Protects the device from damage due to overload.
• 17. Tool Kit Working Mode Switch: Switches working modes.

1.3 Technical Specifications

V500 Pro Circuit Probe

V500 Pro Short Open Circuit Finder

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

1.4 Keypad Introduction

The keypad includes navigation and function buttons:

• ESC button: Returns to the previous screen. For other tests, press ESC button once to exit.
• OK button: Confirm key.
• 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.

2. Product Features

VDIAGTOOL V500 Pro features the following functions: Smart Test, Multimeter, Oscilloscope, 0-5V Power Supply, Component Test, Relay, Injector, and other additional functions.

2.1 Smart Test

This feature contains Voltage Test, Resistance Test, and Positive/Negative Test. It is mainly used for quick tests 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, displaying the test voltage. For example, "VCC" indicates the battery supply voltage (e.g., 12.14V), and "VDC" indicates the current test DC voltage value (e.g., 12.11V).

2.1.2 Resistance Test

When the probe clip (auxiliary ground lead) is connected to one side of a circuit's resistance and the Probe Tip is connected to the other end, 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 up, and the speaker sounds regularly. When the probe detects a negative signal of the power supply, the GREEN LED lights up, and the speaker sounds regularly.

2.2 Resistance

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

2.3 Multimeter

Also known as a volt-ohm-milliammeter (VOM), this feature is a measuring instrument capable of measuring multiple electrical properties.

The interface displays Voltage, Resistance, Diode, Current, Frequency, and Polarity. You can select the test mode using the "Left" or "Right" buttons.

• 1. Voltage (VDC): Connect the probe clip (auxiliary ground lead) to the negative pole and the probe tip to the measured voltage.
• 2. 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.
• 3. Diode (DIO): Connect the probe clip (auxiliary ground lead) to one side of the diode and the probe tip to the other. The display will show voltage and indicate the diode's polarity (positive/negative).
• 4. Current (AMP): The probe is connected in series in the circuit under test to display the current value.
• 5. Frequency (HZ): Displays the frequency of the measured signal and the duty cycle value.
• 6. Polarity: Displays whether the measured line is positive or negative.

2.4 Oscilloscope

This feature is an electronic test instrument that displays electrical signals graphically, typically as Voltage (Y-axis) versus Time (X-axis). The function can be displayed in vertical or transverse screen modes.

The Voltage on the Y-axis shows 0.0V to 10.0V, and the Time on the X-axis shows 1ms to 500ms.

NOTE: Press the “OK” button to pause or refresh the waveform.

2.5 0-5V Power Supply

This feature provides a regulated and stable 0-5V DC output voltage. It is commonly used to power electronic devices requiring a 0-5V DC supply, such as micro-controllers, sensors, LED lights, and USB charging devices.

NOTE: The 0-5V Power Supply is designed as an active mode. It can adjust the voltage output under 5V and limit the current to 100mA, which is a safety feature to prevent burning out electric components.

2.6 Component Test

This feature verifies the input/output behavior of a test object, ensuring its functionality works correctly according to specifications. It focuses on performing separate tests on each component.

It has three activation modes:

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

2.7 Relay

This feature reviews 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 itself. Proper operation must be monitored throughout its life.

When this function is selected and the Relay is not connected, the interface will display "Relay not on". The "VCC" at the center displays the power supply voltage value. It shows two types of common automotive relay diagrams (4-terminal and 5-terminal). Press "UP" to start the test and "OK" to view wiring connection diagrams.

The following are examples of Relay wiring connections:

• Diagram showing a 4-terminal relay connection.
• Diagram showing a 5-terminal relay connection.

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, cycling every 1.4s.
• Mode 3: Outputs 4ms positive, then 10ms negative, cycling every 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. After entering the Injector Test function, 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 on page 19.

3. Setting

3.1 Language

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

3.2 Floodlight ?

Turn the device's headlight on or off.

3.3 Voice ?

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 it functions normally and if there are any black spots.

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.

NOTE: Pressing the ESC key will exit the test directly, indicating the ESC key is working properly.

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

Choose whether the device operates in Light mode or Dark mode.

3.6 Update

To update the device, 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:

1. Ensuring the device is in upgrade mode.
2. Pressing and holding the arrow key of the diagnostic device (no OBD or USB connection needed initially).
3. Holding down the Down arrow key and connecting the device to the computer using the USB cable.
4. Waiting for "UPDATE MODE" to display on the device screen, then releasing the Down arrow key.
5. Clicking the "Upgrade" button in the lower right corner of the software.

3.7 About

This section displays information about the device:

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

4. Test Applications

4.1 Continuity Test

A continuity test quickly checks if a circuit is open or closed. Only a closed, complete circuit has continuity. During this 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 the vehicle's chassis ground or auxiliary ground lead, continuity can be tested on wires and components attached or disconnected from the vehicle's electrical system.

When the probe is contacting a good ground, the LCD screen will display "0.0Ω" and the green LED indicator will light up. If sound is enabled, the buzzer will also beep.

• In other cases, the LCD screen will only display the resistance value.
• If the resistance is greater than 200 KΩ, the LCD screen will display "OL". Another way to verify continuity to ground or battery is by supplying power to the electrical system in Component Activation mode; if the circuit breaker trips, it indicates a good connection with low resistance.

4.2 Signal Circuit Test (Oscilloscope test)

Once a DTC is extracted from a vehicle, a quick test can be performed to verify sensor circuits. 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 good waveform should be a sine wave.
4. Apply vacuum. Release the vacuum pump and observe the reading on the LCD screen.

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

NOTE: Do not perform any 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 for testing.

4.3 Activating Components in Your Hand

While in DC voltage mode, use the probe tip and auxiliary ground lead to activate components directly in your hand for testing their functions. For example, testing a bulb's working condition:

1. Hook up the battery clip to the power supply.
2. Enter "Active" mode and select "MOMENT" function.
3. Connect the auxiliary ground lead to the negative terminal of the component, 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.

4.4 Activating Components in Vehicle

Importance:

• The activation mode is designed only for supply powers or ground and cannot be used for sensitive electronics (like ECU, sensor modules) to avoid burning out components.
• Do not perform any tests on any ECU module or SRS (airbag) system before the system is completely disabled or unplugged.
• Supplying power to the electrical system can damage sensitive electronic components. 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 "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 means the probe is overloaded. This can happen if:

• The contact being probed is direct ground or negative voltage.
• The component being tested is short-circuited.
• The component is a very high current component (e.g., starter motor).

If the probe circuit breaker trips or the "OVERLOADED" message appears on the LCD screen, adjust the overload current value and repeat the operation.

NOTE: To avoid burning out components, refer to the component's specification and parameter to set the OVERLOAD CURRENT VALUE.

4.5 Activating Components / Ground

Test Procedure:

1. Hook up the battery clip to the power supply.
2. Enter "Active" mode and select "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 and 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. This can happen if:

• The contact being probed is direct ground or negative voltage.
• The component being tested is short-circuited.
• The component is a very high current component (e.g., starter motor).

If you are contacting a protected circuit, the vehicle fuse may blow or the probe may trip if you apply ground to it.

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 probe tip to a suspected wire.
3. Press "OK" button to trigger power supply.

The RED LED light will turn ON, and the LCD screen will display values of VDC, AMP, and VCC. If the VDC value is almost the same as VCC and the AMP value is minimum (approaching 0A), it means this 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

In most cases, a short circuit will appear as a blown fuse or fusible link, or an electrical protection device tripping (i.e., a circuit breaker). 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 which trips the circuit breaker is the shorted circuit. Note this wire's identification code or color.
4. Follow the wire as far as you can along the wiring harness.

Example Application:

• If following a short in the brake light circuit, identify the wire passing through the wiring harness at the door sill. Locate the color-coded wire and expose it.
• In "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 wire end that trips the circuit breaker again is the shorted circuit and leads 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 checks the function and direction of the connector and trailer lights. If the trailer light connection is correct, use the "Component Activation" function to test trailer light operation.

5. Short Open Circuit Finder Knowledge

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

A: The Short Open Circuit Finder's LED and LCD pull 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 pressed forward, it conducts full battery current to the probe tip. A safety feature allows you to connect the extra ground lead and press the power switch forward until it trips the circuit breaker. This prevents power to the tip but allows multimeter use. When away from computer components, press the reset button to resume normal operation.

6. Locating Open Circuit

6.1 How to Use the Short Open Circuit Finder

The breaker finder's probe is made of coiled steel and can be bent as needed to reach wires in congested areas. Depending on circuit characteristics and sensitivity settings, the probe picks up signals from the wire within a range of positions. For optimal range, the probe tip (black cap) should be positioned perpendicular (at 90°) to the wire, either above or below it.

CORRECT: Probe tip positioned perpendicular to the wire.

INCORRECT: Probe tip not perpendicular to the wire.

6.2 Setting Sensitivity Level

To increase sensitivity, turn the rotary switch clockwise. To decrease sensitivity, turn it anticlockwise.

6.3 Short Open Circuit Finder Operation Guide

With the probe kit connected to power, select Mode II on the tool kit working mode switch. Switch on the Short Open Circuit Finder and set the rotary switch to the middle position. Press and hold the TEST button, then move the black probe tip along the wire to be tested. The finder detects the signal and sounds the loudspeaker, indicating correct operation.

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 perpendicularly above or below, as close as possible. Check at different points to narrow down the location or trace the wire to the end with the load.

Observe the tone signal. Where the tone signal stops, it indicates the location of the open, break, or bad connection.

If the finder has difficulty picking up a tone signal, try increasing sensitivity by turning the rotary switch clockwise and testing again.

When finished locating the open circuit, disconnect the test leads and release the TEST button.

NOTE: When switching to Mode II and using the Short Open Circuit Finder, plug the banana plug of the Banana Plug to Alligator Clip into the auxiliary ground lead, then clip the other end to the circuit being tested. If the fuse on the Auxiliary ground lead is broken, the entire line may be damaged, so use with caution.

7. Warranty

Limited One Year Warranty

This warranty is expressly limited to buyers who purchase the VDIAGTOOL V500 Pro product for resale or for use in the ordinary course of their business. VDIAGTOOL V500 Pro is warranted against defects in materials and workmanship for one year (12 months) from the date of delivery to the buyer. This warranty does not cover any part that has been abused, altered, used for a purpose other than intended, or used inconsistently with instructions. The exclusive remedy for any defective tool is repair or replacement; VDIAGTOOL shall not be liable for any consequential or incidental damages.

8. Contact Us

Warranty & Support

E-mail: support@vdiagtool.com

Website: www.vdiagtool.com

For wholesale business or to become distributors, E-mail: sales@vdiagtool.com

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9. FAQ

Q1: When switching to Mode II, is it normal that the host device's screen does not light up?

A1: Yes, this is normal. Please do not assume that the device is broken.

Q2: The battery in the Breaker Finder is brand new, so why is there no sound when I get close to the wire?

A2: Please make sure the button on the host device is set to Mode II. In addition, please clip the red and black clips on the host device to the circuit to be tested. If the Breaker Finder still has no sound, it may be that the device is broken. Please shoot a video and send it to support@vdiagtool.com. After analysis, our support team will provide an appropriate solution.

Q3: What electrical components can this device provide power to?

A3: VDIAGTOOL V500 Pro can provide power to electrical components like car lights, windshield wipers, radiator fans, relay, fuel injector, and etc.

Q4: What kinds of vehicles can I use this V500 Pro to test?

A4: It supports testing cars, motorcycles, trucks, steamships, and more.

Q5: What range of DC voltage can I test by using this product?

A5: Mode 1 (circuit tester) can test voltages between 9 and 30 volt DC, and Mode 2 (breaker finder) can test voltages between 6 and 42 volt DC.