LAUNCH X431 Diagnostic Tool User Manual
This document provides comprehensive instructions for the LAUNCH X431 diagnostic tool.
Copyright Information
Copyright © 2023 by LAUNCH TECH CO., LTD. (also called LAUNCH for short). All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying and recording or otherwise, without the prior written permission.
Statement: LAUNCH owns the complete intellectual property rights for the software used by this product. For any reverse engineering or cracking actions against the software, LAUNCH will block the use of this product and reserve the right to pursue their legal liabilities.
Disclaimer of Warranties and Limitation of Liabilities
All information, illustrations, and specifications in this manual are based on the latest information available at the time of publication. The right is reserved to make changes at any time without notice. LAUNCH shall not be liable for any direct, special, incidental, indirect damages or any economic consequential damages (including the loss of profits) due to the use of the document.
Warnings and Safety Precautions
WARNING: Study, understand and follow all instructions provided with this product. Read these instructions carefully before installing, operating, servicing or repairing this tool. Keep these instructions in a safe, accessible place.
Caution: To help prevent personal injury:
- Never use this tool for any application other than for which it was designed.
- Never alter or modify this tool in any way. Improper operation and / or maintenance of the tool, or modification of the tool could result in serious injury or death.
- Always perform automotive testing in a safe environment.
- 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.
- Wear safety eye protection that meets ANSI standards.
- Keep clothing, hair, hands, tools, test equipment, etc. away from all moving or hot engine parts.
- Operate the vehicle in a well-ventilated work area: Exhaust gases are poisonous.
- Put blocks in front of the drive wheels and never leave the vehicle unattended while running tests.
- 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 (for M/T), and make sure the parking brake is engaged.
- Keep a fire extinguisher suitable for gasoline / chemical / electrical fires nearby.
- Do not connect or disconnect any test equipment while the ignition is on or the engine is running.
- Keep this tool dry, clean, free from oil / water or grease. Use a mild detergent on a clean cloth to clean the outside of the tool, when necessary.
Compliance Information
FCCID: XUJOCEX403
Any Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment.
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
Note: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation.
This equipment generates, uses, and can radiate radio frequency energy, and if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:
- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and receiver.
- Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
- Consult the dealer or an experienced radio / TV technician for help.
The device has been evaluated to meet general RF exposure requirement. The highest reported SAR for stand-alone and simultaneous transmission exposure conditions are below the maximum value. End-users must be informed of the operating requirements for satisfying RF exposure compliance.
This device is in compliance with the essential requirements and other relevant provisions of Radio Equipment Directive 2014/53/EU. The RF frequencies can be used in Europe without restriction.
Table of Contents
The document includes a detailed table of contents covering:
- Introduction (Vehicle Coverage, OBD II, Definitions, DTCs, DLC Location)
- Product Descriptions (Components & Controls, Technical Specifications, Accessories Checklist)
- Initial Use (Powering Up, Getting Started, Job Menu)
- Diagnose (Connection, System Diagnosing, Smart Diagnosis, Manual Diagnosis, OBD II Diagnosis, History)
- Upgrade (Software & App, Renew Subscription)
- Mall (Software Subscription)
- Settings (Units, Auto-detection, Brightness, Sound, Network, Time Zone, Language, Workshop Info, Recovery, Clean Up, Screen Capture, About, Data Management)
- FAQ
- Warranty and Customer Service
1. Introduction
1.1 Vehicle Coverage
This diagnostic tool is designed to work with all OBD II compliant vehicles, including Controller Area Network (CAN). The EPA requires that all 1996 and newer vehicles (cars and light trucks) sold in the United States must be OBD II compliant, encompassing American, Asian, and European vehicles. A small number of 1994 and 1995 gasoline vehicles are also OBD II compliant. To verify compliance for these years, check the Vehicle Emissions Control Information (VECI) Label, typically located under the hood or by the radiator, which will state "OBD II Certified".
Government regulations mandate that all OBD II compliant vehicles must have a common 16-pin Data Link Connector (DLC). Some 1994 and 1995 vehicles may have 16-pin connectors but are not OBD II compliant; only those with the "OBD II Certified" label are compliant.
1.2 On-Board Diagnostics (OBD) II
The OBD II system monitors emission control systems and key engine components through continuous or periodic tests. It provides three key pieces of information:
- Malfunction Indicator Light (MIL) status (on/off).
- Stored Diagnostic Trouble Codes (DTCs).
- Readiness Monitor status.
1.3 OBD II Definitions
Key terms related to OBD II systems include:
- EOBD: European On-Board Diagnostics, similar to OBD II with the same DLC and protocols.
- Communication Protocols: Systems for vehicle communication, including CAN Bus, J1850 VPW, ISO 9141-2, J1850 PWM, and ISO 14230 KWP.
- Powertrain Control Module (PCM): The vehicle's "on-board computer" that manages engine, emissions, and powertrain systems. It can also communicate with other vehicle systems like ABS and body control.
- Data Link Connector (DLC): The 16-cavity connector on the vehicle for communication between the computer and the diagnostic tool.
- Malfunction Indicator Light (MIL): The "Check Engine" warning light that illuminates when a DTC is stored.
- Diagnostic Trouble Code (DTC): A code stored in the computer's memory to identify a fault condition causing the MIL to activate.
- Freeze Frame Data: Operating conditions stored when a DTC is recorded.
- PID (Parameter Identification Data): Data returned by vehicle control modules to the diagnostic tool.
- Monitors: Diagnostic routines programmed into the PCM to test and monitor emissions-related components.
- Enabling Criteria (Enabling Conditions): Vehicle-specific events or conditions required for monitors to set or run. Some require a specific "drive cycle".
- Trip: A period of driving where required "Enabling Criteria" for a monitor are met. A "Trip Drive Cycle" begins when the ignition is turned "On" and ends when it's turned "Off", provided all criteria are met.
- Drive Cycle: A specific mode of vehicle operation that ensures all readiness monitors are set to "ready". It's used after DTCs are cleared or the battery is disconnected to allow the vehicle to run its onboard diagnostics.
- Warm-up Cycle: Vehicle operation after engine shutdown where temperature rises significantly (at least 40°F/22°C) and reaches at least 160°F/70°C. The PCM uses these to automatically erase specific codes if no related faults are detected.
- Fuel Trim (FT): Adjustments to the base fuel schedule. Short-term FT is dynamic, while long-term FT is more gradual, compensating for vehicle differences and changes over time.
1.4 Diagnostic Trouble Codes (DTCs)
OBD II DTCs are stored by the vehicle's computer to identify problem areas. They are five-digit alphanumeric codes. The first character (a letter) indicates the control system, the second character (a number, 0-3) indicates the code type (Generic or Manufacturer Specific), and the last three characters (hexadecimal, 0-9 or A-F) provide specific information about the fault and its conditions. For example, P0201 indicates an "Injector circuit malfunction, Cylinder 1".
A diagram illustrates the DTC structure: P0202 example with breakdown into Systems (P=Powertrain, B=Body, C=Chassis, U=Network), Code Type (Generic/Manufacturer Specific), and Sub-systems (e.g., 1=Fuel and air metering, 3=Ignition system or misfire).
1.5 Location of the Data Link Connector (DLC)
The DLC is typically a 16-pin connector used for interfacing with the vehicle's onboard computer. It's usually located about 12 inches from the center of the instrument panel, on the driver's side, but can vary by vehicle design. A diagram shows common locations (A-F) corresponding to various vehicle manufacturers like Opel, Volkswagen, Audi, Honda, Changan, Hyundai, Kia, Toyota, Nissan, Mitsubishi, Renault, BMW, Mercedes-Benz, Mazda, GM, Chrysler, Peugeot, Regal, Beijing Jeep, and Citroen.
If the DLC cannot be found, consult the vehicle's service manual.
2. Product Descriptions
2.1 Components & Controls
The LAUNCH X431 diagnostic tool features the following components:
| No. | Name | Descriptions |
|---|---|---|
| 1 | Charging port | Charge the tool via data cable (not included). |
| 2 | DB-15 diagnostic connector | Connect the diagnostic cable. |
| 3 | Power button | Turn on/off the tool. |
| 4 | Touch screen | Indicate the test results. |
| 5 | OK button | Confirm a selection (or action) from a menu list. |
| 6 | Selection buttons | Move the cursor up/down or turn page up/down. |
| 7 | BACK button | Exit the current program or return to the previous screen. |
| 8 | HOME button | Navigate to the home (Job menu) screen. |
2.2 Technical Specifications
- Screen: 4" touch screen with a resolution of 480*800
- CPU: 4-core 1.5GHz processor
- RAM: 2GB
- ROM: 32GB
- WiFi: 802.11b/g/n 2.4GHz
- OBD II input voltage range: 9~18V
- Power up via: DC 5V data cable (not included) or Diagnostic cable through connection to vehicle's DLC
- Working temperature: -10 to 50°C (14 to 122 F°)
- Storage temperature: -20 to 70°C (-4 to 158 F°)
2.3 Accessories Checklist
For detailed accessory items, please consult the seller. Standard accessories include:
- Diagnostic scanner
- Diagnostic cable
- User manual
- Quick start guide
3. Initial Use
3.1 Powering Up The Tool
The tool can be powered up in two ways:
- Via Data Cable: Connect one end of the data cable (not included) to the tool's charging port and the other end to a PC.
- Via Diagnostic Cable: Insert the diagnostic cable into the vehicle's DLC port. The screen will light up automatically when the tool is powered on.
3.2 Getting Started
For first-time use, system settings are required:
- Press the [POWER] button to turn on the tool. A welcome page will appear; tap "Start".
- Choose the desired system language and tap "Next step".
- Select your current time zone; the system will configure the time accordingly.
- The system will search for available Wi-Fi networks; select the desired network.
- After network connection, tap "Next step" to configure workshop information. Enter the required details and tap "Next step". This information will be appended to reports.
- Read and agree to the user agreement terms by checking "Agree to all the above terms" and tapping "OK" to complete registration. The tool will then navigate to the Job Menu.
3.3 Job Menu
The Job Menu provides access to the following function modules:
- Diagnose: Configure the tool to operate as a professional diagnostic tool.
- OBD II: Quickly check for DTCs, identify MIL causes, check monitor status for emissions certification, verify repairs, and perform other emission-related services.
- Upgrade: Update vehicle diagnostic software and APK. Requires a stable network connection.
- Mall: Subscribe to additional vehicle diagnostic software or special function software not included with the tool.
- Settings: Manage data and system settings, including Network setup, Workshop information, and Brightness.
4. Diagnose
4.1 Connection
- Turn the vehicle's ignition off.
- Locate the vehicle's 16-pin Data Link Connector (DLC) (refer to Chapter 1.5).
- Connect one end of the diagnostic cable to the vehicle's DLC port and the other end to the tool's DB-15 diagnostic connector. Tighten the captive screws.
Notes:
- Some vehicles may have a plastic DLC cover that needs to be removed.
- The cable connector is keyed and fits only one way. If it doesn't connect, rotate it 180° and try again.
- Turn the ignition on. The engine can be off or running.
Caution: Do not connect or disconnect any test equipment with the ignition on or the engine running.
4.2 System Diagnosing
This function is designed for diagnosing electronic control systems of a single vehicle model.
Notes:
- The diagnostic software includes various reset functions that can be performed directly from this module (select "Special function" from the diagnostic function list).
- Software is updated periodically; installing the latest version is recommended for optimal service. Pre-installed software updates are free forever. Software purchased via the "Mall" is free for one year, after which a subscription renewal is required.
- Additional vehicle coverage can be purchased through the "Mall".
4.2.1 Smart Diagnosis (Auto-Detect)
This function allows quick access to vehicle electronic control systems by decoding the VIN, bypassing manual menu selection. After connecting the tool and turning the ignition key on, the system enters auto-detect mode.
Notes:
- Ensure "Automatic detection on connect" in "Settings" is enabled (ON).
- A stable network connection is recommended for successful VIN access.
A. Successful VIN Acquisition: If the VIN is obtained, the system scans vehicle systems. A diagnostic report is automatically generated in Settings -> Data -> Diagnostic Report.
B. Failed VIN Access: If the tool fails to access VIN information, an input screen will appear. Input the VIN and tap "OK" to decode and proceed with Smart Diagnosis. If unsuccessful, the system will enter Manual Diagnosis mode.
Notes on VIN:
- The VIN is typically found on the top left corner of the dashboard, driver's door, door post, or under the hood near the firewall.
- VINs are standardized 17-character alphanumeric codes. Letters I, O, and Q are omitted to prevent misreading. No signs or spaces are allowed.
4.2.2 Manual Diagnosis
If VIN information cannot be obtained or analyzed, Manual Diagnosis can be performed. This involves following menu-driven commands and on-screen instructions.
Notes:
- Ensure the corresponding vehicle manufacturer software is installed on the tool before diagnosing.
- The diagnostic menu may vary by vehicle make, model, and year.
A flowchart illustrates the manual diagnosis process:
- Select "Diagnose".
- Select Vehicle Manufacturer.
- Select Vehicle Model.
- Select Scan Mode (Automatic System Detection or Manual System Detection).
- Select Test Function (e.g., Special Functions, Read Data Stream, Clear Fault Code, Read Fault Code, Read Version Information).
The manual uses DEMO V15.34 as an example. Illustrations are samples and may vary. Full function software can be purchased in the "Mall".
Steps for DEMO V15.34 example:
- Select diagnostic software version: Tap "DEMO".
- Select vehicle model (varies by version).
- Turn the ignition key to ON.
- Read vehicle information: Double-check the displayed vehicle information and tap "Yes" if correct.
- Select test item: Choose the desired test item.
4.2.2.1 Health Report (Quick Test)
This function accesses electronic control units and generates a detailed vehicle health report. Tapping "Health Report" initiates a scan of the ECUs.
The screen displays tested systems with fault codes indicated by a red cross (❌) and OK statuses by a green tick (✔️).
On-Screen Buttons:
- Report: Tap to save the diagnostic result.
- Clear Code: Tap to clear existing diagnostic trouble codes.
4.2.2.2 System Scan
This option quickly scans installed vehicle systems.
4.2.2.3 System Selection
This option allows manual selection of test systems and functions. Tap "System Selection" and then the desired system (e.g., "Engine") to enter the test function selection screen.
Note: Diagnostic menus differ by vehicle.
A. Read Fault Code
This function displays detailed DTC records from the vehicle's control system. Tapping "Read Fault Code" shows the diagnostic result.
Note: DTC retrieval is part of a larger diagnostic strategy. Never replace parts based solely on DTC definitions; follow testing procedures in the vehicle's service manual.
On-Screen Buttons:
- Help: View help information.
- Code Search: Search for DTC information online.
- Report: Save data in text format. Reports are accessible via Settings -> Data -> Diagnostic Report.
B. Clear Fault Code
After reading codes and performing repairs, this function erases codes from the vehicle. Ensure the ignition key is ON with the engine OFF before use.
Notes:
- If taking the vehicle to a service center, DO NOT erase codes, as this data is valuable for troubleshooting.
- Clearing DTCs does not fix the underlying problem. If repairs are not made, the codes and check engine light may reappear.
C. Read Data Stream
This option retrieves and displays live data and parameters from the vehicle's ECU. Tapping "Read Data Stream" shows data stream items.
On-Screen Buttons:
- Select All: Selects all items on the current page. Check individual boxes for specific items.
- Unselect: Deselects all data stream items.
- OK: Confirms selection and proceeds to the data stream reading page.
Notes:
- Values outside the standard range display in red; compliant values display in blue.
- The 1/X indicator shows current/total pages. Swipe left/right to navigate pages.
- Three display modes are available: Value (numbers/lists), Graph (wave patterns), and Combine (merged graphs for comparison).
On-Screen Buttons for Graph View:
- [Graph Icon]: View the waveform graph of a data stream item.
- Combine: Select up to 4 items to view their waveforms simultaneously.
- Report: Save the current data as a diagnostic report (accessible via Settings -> Data -> Diagnostic Report).
- Record: Record and save Live Data for troubleshooting assistance (accessible via Settings -> Data -> Diagnostic Record).
D. Special Functions
Offers coding, reset, relearn, and other service functions to restore vehicle functionality after repair or replacement. Available tests vary by vehicle manufacturer, model, and year.
4.3 OBD II Diagnosis
This function provides a quick way to check DTCs, identify MIL causes, verify repairs, and perform other emission-related services. After connecting to the vehicle's DLC and tapping "OBD II" in the Job Menu, the tool checks the vehicle's computer for communication protocol and displays the Monitor Status. Tap "OK" to see the function list:
- Read Codes: Identifies malfunctioning emission control system sections.
- Erase Codes: Erases codes after retrieval and repairs. Ensure ignition is ON with the engine OFF.
- I/M Readiness: Checks if emissions-related systems are ready for Inspection and Maintenance testing, and confirms repair status.
- Data Stream: Retrieves and displays live data and parameters from the vehicle's ECU.
- View Freeze Frame: Captures operating conditions when an emission-related fault occurs. Freeze Data may not be stored if DTCs were erased.
- O2 sensor test: Retrieves O2 sensor monitor test results from the vehicle's computer.
- On-board monitor test: Retrieves test results for emission-related powertrain components not continuously monitored. Availability depends on the vehicle manufacturer.
- EVAP System Test: Initiates a leak test for the vehicle's EVAP system. Refer to the service manual for test procedures.
- Vehicle Info: Retrieves vehicle manufacturer information from the onboard computer, including VIN (Vehicle Identification Number), CID (Calibration ID), and CVN (Calibration Verification Number).
4.4 History
The History function records details of each diagnostic session, providing direct access to previously tested vehicles and allowing users to resume operations without starting from scratch. Diagnostic records are listed chronologically on the screen after tapping "History" in the Diagnose main menu.
5. Upgrade
This function allows updating the diagnostic app and software. It is recommended to install the latest software versions for optimal service.
- Diagnostic software pre-installed on the tool can be used and updated free of charge forever.
- Software purchased via the "Mall" is free for one year; renewal is required thereafter. Ensure a strong Wi-Fi connection during updates.
5.1 Update Diagnostic Software & App
Tap "Upgrade" on the Job menu to access the update center. By default, all diagnostic software is selected. Deselect software by tapping "Unselect" and checking the box next to the model. Tap "Update" to download; the process may take several minutes. Software packages install automatically upon completion.
5.2 Renew Subscription
Software purchased via the "Mall" is free for one year. After expiration, the version will be locked and requires renewal. Tap "Upgrade" on the Job menu, then "Renew" to enter the Mall, select the desired software, and follow on-screen instructions to complete the renewal. The latest diagnostic software will then be ready for use.
6. Mall
This function allows subscribing to vehicle diagnostic and reset software not pre-installed on the tool. The "Mall" offers software covering full systems and functions (excluding online programming/coding) at different prices. Tap "Mall" to open it, select target software, and follow instructions to complete the transaction.
Note: Software services are virtual goods, effective immediately upon successful transaction, and are non-refundable. Double-check order information during payment. Subscribed software is free for one year; it becomes disabled upon expiration and requires re-subscription.
7. Settings
- 7.1 Units of measurement: Set measurement units (Metric or English System).
- 7.2 Automatic detection on connect: Enable or disable automatic VIN detection when the tool is connected to the vehicle's DLC.
- 7.3 Brightness: Adjust standby time and screen brightness. Reducing brightness conserves power.
- 7.4 Sound: Adjust volume and other sound settings.
- 7.5 Network: Use the built-in WLAN module to register the tool, update software/APK, and send emails wirelessly.
- 7.6 Time Zone: Set the tool's time zone.
- 7.7 Language: Change the tool's display language; multiple languages are supported.
- 7.8 Workshop information: Add a personalized tag to diagnostic reports. This tag is appended to every successfully generated report.
- 7.9 Recovery: Reset the tool to default factory settings. Warning: Resetting may cause data loss; proceed with caution.
- 7.10 Clean Up: Clear cache files to free up storage space.
- 7.11 Screen Capture: Set the Screen Capture icon to be shown or hidden.
- 7.12 About: Displays hardware configuration information and the license agreement.
- 7.13 Data:
- 7.13.1 Diagnostic Record: Stores recorded running parameters or waveform graphs.
- 7.13.2 Diagnostic Report: Stores all generated diagnostic reports.
- 7.13.3 DTC Library: Provides details of DTCs to simplify the diagnostic process. A screen displays DTC categories (U, P, C) and counts.
- 7.13.4 DLC (Data Link Connector) Location: Helps locate the vehicle's DLC.
- 7.13.5 Feedback: Send feedback on diagnostic problems for analysis and troubleshooting.
- 7.13.6 Image: View and manage screenshots created during diagnostic work.
- 7.13.7 Firmware Fix: Upgrade and fix diagnostic firmware. Do not cut power or switch interfaces during fixing.
- 7.13.8 User Manual: The user manual is integrated into the tool for easy reference.
8. FAQ
Frequently asked questions and answers:
- System halts when reading data stream: May be caused by a slackened connector. Turn off the tool, firmly connect the connector, and switch it on again.
- Screen flashes at engine ignition start: Caused by electromagnetic disturbing; this is normal.
- No response when communicating with on-board computer: Confirm power supply voltage, check if the throttle is closed, transmission is in neutral, and water temperature is normal.
- System fails to start auto VIN detection: Check if the tool is properly connected to the DLC port and if "Automatic detection on Connect" is enabled in Settings.
- Many fault codes: Usually caused by poor connection or faulty circuit grounding.
- How to upgrade the system: Switch the tool on, ensure a stable internet connection, navigate to Settings -> About -> Version, tap "Detect the System Version", and follow on-screen instructions. The process may take several minutes. The tool will restart automatically upon successful completion.
Warranty
This warranty is limited to persons purchasing LAUNCH® products for resale or use in the ordinary course of business. LAUNCH® electronic products are warranted against defects in materials and workmanship for one year (12 months) from the date of delivery. The warranty does not cover abuse, alteration, misuse, or use inconsistent with instructions. The exclusive remedy is repair or replacement; LAUNCH is not liable for consequential or incidental damages. Defect determination is made by LAUNCH according to stipulated procedures.
Order Information
Replaceable and optional parts can be ordered from an authorized tool supplier. Orders should include Quantity, Part number, and Item description.
Customer Service
For questions regarding operation, contact the seller or LAUNCH TECH CO., LTD.:
- Website: www.x431.com
- Website: www.cnlaunch.com
- Phone: +86 755 2593 8674
- Email: DOD@cnlaunch.com
X431
