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![]() | Bluetooth Connection Indicator | Solid Blue: Bluetooth connected |
![]() | Power Indicator | Solid Red: power on |
![]() | Communication Indicator | Flashing Green: communicating with the vehicle |
For iOS: Search for "TopGuru" in App Store to download and install.
For Android: Search for "TopScan" in Google Play to download and install.
Note:
This app is compatible with iOS 11.0 or later / Android 7.0 or later.
Open the app and log in to your TOPDON account. (If you do not have an account, please register with your email.)
Figure 3-2
You will need to download the vehicle-specific software the first time you use the diagnostic function. Tap Diagnostics from the home screen and download the software you need.
Figure 3-4
Note:
Make sure the ignition is OFF before plugging in the unit.
Figure 3-5
To locate the vehicle's DLC, tap Repair Information >> DLC Location, select vehicle make, model and year, and tap Next. A picture of DLC location for the selected vehicle will display.
Figure 3-6
(see Figure 3-7)
If your vehicle is equipped with a keyless start system and the ignition switch is an "Engine Start Stop" button (see Figure 3-8), press the "Engine Start Stop" button until the car is in "ON" mode. Do not apply the brake while pressing the "Engine Start Stop" button or you will start the car instead of putting it in the "ON" position.
The method of ignition varies by vehicle model. Refer to the vehicle's service manual for details.
Tap the icon at the top right of any screen with this icon to establish Bluetooth connection with the TopScan unit. After the connection is successfully established, the icon changes to
.
Once Bluetooth is successfully paired, the connection will be automatically established when you open the app. If not connected, manually tap the icon to reconnect.
Figure 3-9
![]() Diagnostics | Configures the TopScan to operate as a scan tool. |
![]() IMMO (Optional) | Configures the TopScan to operate as a key programming tool. |
![]() I/M Readiness | Provides quick access to check the status of the emission-related systems. |
![]() Vehicle Performance | Allows you to perform acceleration tests on your vehicle. |
![]() VE Calculator | Allows you to calculate Volumetric Efficiency (VE) to check the engine performance. |
![]() T-Darts | Configures the TopScan to operate as a transponder reader and remote frequency tester. |
![]() Home | Selecting this icon returns you to the home screen. |
![]() Mall | Allows you to purchase or renew diagnostic / IMMO software license. |
![]() Messages | Selecting this icon opens the message screen. |
![]() Me | Selecting this icon opens the Me screen, which allows you to view the account profile, saved data files, and FAQ, manage the installed software and connections to VCI / T-Darts, look up vehicle coverage, check for firmware updates, and access general settings. |
The Diagnostics module allows you to scan all supported vehicle systems at one time (Auto Scan) for Diagnostic Trouble Codes (DTCs) or select an individual system to perform Read Trouble Code, Clear Trouble Code, Read Data Stream, Read Version Information and Active Test. You can also access EOBD and Diagnostic Feedback through this module.
Auto Scan and Individual System Diagnostics
Identifying the Vehicle
To perform Auto Scan or Individual System Diagnostics, you need to identify your vehicle first.
Auto Scan
Auto Scan detects the systems supported by the vehicle and retrieves DTCs for all of these systems, providing a complete health check of your vehicle. Performing Auto Scan before and after repair could help in troubleshooting and validating repairs. Pre and post scan reports can allow you to record the condition of the vehicle before and after repair for comparison.
To perform an Auto Scan, tap the Auto Scan button. The TopScan will start scanning all the systems supported by the vehicle, and DTC retrieval will be automatically proceeded.
Results are displayed progressively as the systems are scanned.
Figure 4-6
Button Description
Report - tap to save the current scan results in report format. (To view the saved reports, go to Me > Diagnostic Report.)
Clear DTCs - tap to clear all the DTCs retrieved.
Show All / Show Actual - tap to toggle between showing all vehicle systems and showing only the supported systems.
Performing Individual System Diagnostics
To access the function menu of a certain system:
From the systems menu, select the desired vehicle system. Available function options for the system will be displayed. Select a function to continue.
Figure 4-7
Note: Depending on the vehicle make, some functions may not be available.
Read Version Information
Tap Information in the function menu. Then you can view the version information of the Electronic Control Unit (ECU) for the currently selected system.
Read Trouble Code
To retrieve DTC for the currently selected system:
Tap Read Trouble Code in the function menu. TopScan will communicate with the ECU and retrieve and display DTCs for the currently selected system.
Figure 4-8
Icon Description
![]() | Tap to open a window that allows you to search on Google for more information about the DTC. |
![]() | When the icon lights up, tap to view the detailed description of the DTC. |
![]() | When the icon lights up, tap to view the freeze frame captured at the time when the DTC occurs. |
![]() | When the icon lights up, tap to view the instructional repair measures. |
Button Description
Report - tap to save the results in report format. (To view the saved reports, go to Me > Diagnostic Report.)
Clear DTCs - tap to clear all the DTCs retrieved.
Clear Trouble Code
To clear DTCs for the currently selected system:
Note:
Read Data Stream
To view data stream for the currently selected system:
Active Test
Note:
Available tests vary by vehicle make, year and model.
EOBD
The EOBD function allows you to perform emission-related diagnostics for your vehicle.
To perform EOBD Diagnostics:
Note: Depending on the vehicle make, some functions may not be available.
Typical function options may include:
DTC & FFD (Freeze Frame Data)
This function helps retrieve and clear DTCs stored in the vehicle's ECU and displays FFD of the emission-related systems.
Note:
I/M (Inspection and Maintenance) Readiness
This function checks whether or not the various emission-related systems on the vehicle are operating properly, and are ready for I/M testing.
It can also be used to check the monitor running status and to confirm if the repair of a car fault has been performed correctly.
Live Data
This function displays the real-time live data and parameters from the vehicle's ECU.
O2 Sensor Monitor
This function displays O2 sensor monitor test results of the most recently completed tests from the vehicle's ECU.
On-Board Monitor
This function displays the test results for emission-related powertrain components and systems that are not continuously monitored.
Component Test
This function helps send control commands to the vehicle's ECU as a way to test and operate the system parts and components.
Vehicle Information
This function displays a list of information (provided by the vehicle manufacturer) from the vehicle's ECU.
The information may include:
Diagnostic Feedback
The TopScan allows you to instantly send diagnostic feedback (with logs of diagnostic data automatically attached) while you are encountering a software problem with the diagnostics operations. To send diagnostic feedback:
IMMO is an optional function allows you to perform IMMO related functions such as Number of Keys, Read Pin Code, Remote Control Learning, Add Key, Erase Key and All Key Lost.
Note:
To access the IMMO functions, you need to purchase IMMO software license (tap Mall in the toolbar of the home screen to order). For the advanced product version - TopScan Pro, the IMMO function is included for free for one year.
To perform the IMMO functions:
Tap IMMO from the home screen. Download the IMMO software according to your vehicle make. Then identify your vehicle to get access to the function menu. Select a function to continue. Follow the on-screen instructions to perform the procedures.
Note:
Available functions may vary by vehicle make, year and model.
This function checks whether or not the various emission-related systems on the vehicle are operating properly, and are ready for I/M testing.
It can also be used to check the monitor running status and to confirm if the repair of a car fault has been performed correctly.
Note:
The vehicle should only be considered ready for inspection and allowed to pass emissions if all required tests have been passed.
Vehicle Performance Test allows you to make accurate measurements of vehicle acceleration, providing results at intervals defined by set speed and fixed distance measurements.
Performing a Vehicle Performance Test
Button Description
Start - tap to reset for the next run
Test Report - tap to view the test results
0-60 MPH / (1/4 mi) - tap to toggle between 0-60 MPH result screen and 1/4 mi result screen.
Edit - tap to set the start and end speeds.
Viewing Test Results
1/4 mi Test Results - record the elapsed time for a vehicle to travel a certain distance (60 ft, 330 ft, 1/8 mi, 1000 ft, 1/4 mi), and the instantaneous speed at each point (see Figure 4-18 and Figure 4-21).
0-60 MPH Test Results - record the elapsed time for a vehicle to accelerate from 0 to 60 miles per hour (see Figure 4-19). The values for the start and end speeds can be changed if desired.
Speed Test Results - record the elapsed time for a vehicle to accelerate to a specific speed (see Figure 4-21).
The VE Calculator allows you to calculate the volumetric efficiency of your vehicle engine, which is one of an important engine performance parameters.
To calculator the VE:
Tap VE Calculator from the home screen, enter the required values including Engine Size, Engine Speed, MAF, Intake Air Temp, Number of Cylinders, and Air Intake Pressure. Then, tap Calculate.
The T-Darts function is used to read transponder information, test remote control frequency and test IMMO / PKE coil. To access the T-Darts function, additional hardware (sold separately) is required. To purchase the T-Darts unit, contact your local dealer.
The TopScan supports 8 special functions, including Oil Reset,
Throttle Adaptation, Electronic Parking Brake (EPB) Reset, Steering
Angle Reset, Diesel Particulate Filter (DPF) Regeneration, Anti-lock Braking System (ABS) Bleeding, Battery Management System (BMS) Resets, and Airbag Reset.
For the advanced TopScan Pro version, there are 5 additional special functions available, which include Injector Coding, Tire Pressure Monitoring System (TPMS) Reset, Sunroof Initialization, Seat Calibration, and Window Calibration.
Services Overview
Oil Reset
This function allows you to reset the oil service lamp for the engine oil life system, which calculates an optimal oil life change interval depending on the vehicle driving conditions and weather events. Oil reset is required every time the engine oil is changed.
EPB Reset
This function helps you replace and reset the brake pads.
It needs to be performed in the following cases:
Steering Angle Reset
If the steering angle sensor is replaced, or the steering angle is inaccurate or not centered, the steering angle reset function needs to be performed to find the relative zero position. With this position as a reference, the ECU can then calculate the exact angle for left and right steering.
BMS Reset
After the car battery is replaced, the car battery control unit needs to be reset. This will clear fault information (such as low battery level) so that the control unit can match the relevant information of the newly replaced battery.
ABS Bleeding
When the brake system is opened to replace components such as brake pump, master cylinder, brake lines or brake fluid, air gets inside, which can lead to a soft brake pedal. ABS Bleeding is required to restore the firmness of the brake pedal.
Throttle Adaptation
If the ECU is disconnected accidentally, or if the throttle is replaced or cleaned, then the throttle actuators need to be initialized via the Throttle Adaptation function. This resets the ECU's data to its initial state so that the throttle can accurately regulate the air intake.
DPF Regeneration
This function is mainly used for the regeneration of diesel particulate filters. To keep the filters performing well it removes particles by means of combustion and oxidation.
Airbag Reset
This function allows you to reset the airbag data to turn off the airbag light, so that the airbag control module can run normally.
It needs to be performed in the following cases:
Injector Coding
After replacing injectors, various codes need to be written to correspond to the code of each cylinder injector. This controls the quantity of oil injection into each cylinder.
TPMS Reset
After the tire has been reinflated or replaced, the tire pressure information needs to be reset via the tire pressure reset function to resolve the tire pressure fault code.
Sunroof Initialization
This function is used to initialize the sunroof control module data, set the sunroof lock switch, close the sunroof in case of rain, check memory function for sliding/tilting sunroofs, gauge outside temperature threshold, etc.
Seat Calibration
Seat Calibration is necessary when a vehicle's seat, which has memory functions, is replaced or repaired.
Window Calibration
When a vehicle's battery is disconnected or low on power, or after the window motor has been replaced, the automatic up and down functions of the electronic window regulator may fail. If this occurs, Window Calibration is necessary to initialize the vehicle doors and windows for normal operation.
Performing a Service Reset
DTC Repair Guide
The DTC Repair Guide is an experience-based database of generic OBD-II DTCs, which provides code-specific information, including popular fixes and repair steps for identifying faults.
To use the DTC Repair Guide:
Tap Repair Information > DTC Repair Guide. Enter a DTC in the search bar to search.
Technical Service Bulletins
To view technical service bulletins:
Tap Repair Information > Technical Service Bulletins. Select vehicle make, model, year, system and subsystem, and tap Next. A list of OEM technical service bulletins issued for the selected vehicle will display. Tap the desired option to view the full content.
DLC Location
To view DLC location:
Tap Repair Information > DLC Location. Select vehicle make, model and year, and tap Next. A picture of the DLC location for the selected vehicle will display.
Warning Light Library
The Warning Light Library provides information on dashboard warning lights, including light descriptions, impacts on driving, typical causes, responsive measures and relevant FAQs.
To use the Warning Light Library:
Tap Repair Information > Warning Light Library. A list of warning lights will display. Tap the desired option to view the details.
Account Profile
You can tap the profile photo to view and edit the profile information.
Data Stream
Allows you to view the saved data stream information.
Diagnostic Report
Allows you to view the saved diagnostic reports.
Vehicle Coverage Lookup
Allows you to check whether the TopScan is applicable to your vehicle.
Device Management
Allows you to bind the VCI / T-Darts (sold separately) to your account.
Firmware Update
Allows you to update the VCI firmware if a new version is available.
Uninstall Software
Allows you to uninstall the vehicle-specific Diagnostics, IMMO or T-Darts software.
FAQ
Allows you to view the frequently asked questions.
Settings
The Settings function provides general setting options including language setting, unit setting and cache clearing, and allows you to view the version information of the app.
Bluetooth | Version: Bluetooth 5.0 Range: 33 feet (10 m) |
Operating System Supported | iOS 11.0 or later Android 7.0 or later |
Storage Temperature | -4 ℉ to 158 ℉ (-20 ℃ to 70 ℃ ) |
Working Temperature | 14 ℉ to 122 ℉ (-10 ℃ to 50 ℃ ) |
Dimensions | 84.1 × 50.4 × 27.2 mm (3.31 × 1.98 × 1.07'') |
Net Weight | 78 g (2.75 oz) |
Q What should I do if a communication error occurs?
A Follow the steps below to identify the problem:
Q Why do I need to download the diagnostic software after installing the TopScan app?
A Since there are various vehicle manufacturers, different diagnostic software is required for different brands.
Q What special functions does the TopScan support?
A The TopScan supports 8 special functions, including Oil Reset, Throttle Adaptation, EPB Reset, ABS Bleeding, Steering Angle Reset, DPF Regeneration, Airbag Reset, and BMS Reset. For the advanced product version - TopScan Pro, there are 5 additional special functions avaiable, including Injector Coding, TPMS Reset, Sunroof Initialization, Seat Calibration, and Window Calibration.
Q Do I need to update the firmware before using it for the first time?
A Yes. Firmware will automatically update to the latest version once the TopScan is connected with your phone via Bluetooth. You can also tap Me > Firmware Update to update the firmware manually.
Q Can multiple devices be bound to one TopScan app account?
A Yes.
Here you can download full pdf version of manual, it may contain additional safety instructions, warranty information, FCC rules, etc.
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