Introduction
This manual provides detailed instructions for the operation and maintenance of your KONNWEI KW850 OBD2 Scanner and KW510 Battery Charger Tester. The KW850 is designed for comprehensive vehicle diagnostics, while the KW510 offers advanced battery testing, charging, and repair functionalities. Please read this manual thoroughly before using the devices to ensure proper and safe operation.
General Safety Information
- Always wear eye protection when working with vehicle batteries.
- Ensure adequate ventilation when charging batteries to prevent accumulation of explosive gases.
- Keep the devices away from moisture, oil, and grease.
- Do not operate the devices if they appear damaged.
- Refer to your vehicle's service manual for specific safety precautions.
- Keep children and unauthorized personnel away from the work area.
KONNWEI KW850 OBD2 Scanner
1. Product Overview
The KONNWEI KW850 is a professional OBD2 diagnostic scanner designed to read and clear engine fault codes, display live data, perform I/M readiness tests, and more. It is compatible with most 1996 and newer gasoline or diesel vehicles (OBDII & CAN) in the USA.

Image: The KONNWEI KW850 OBD2 Scanner (left) and KW510 Battery Charger Tester (right) displayed together. The KW850 features a color screen and navigation buttons, while the KW510 has a screen and battery clamps.

Image: A close-up of the KONNWEI KW850 OBD2 Scanner's display, showing various diagnostic functions such as "Diagnostic," "DTC Lookup," "Review," and "Tool Setup." Icons for Live Battery Monitor, O2 Sensor Test, On-board Monitor, I/M Readiness Test, Lifetime Free Smart Update, Monitor Reset, Data Storage & Print, and Vehicle Information are also visible.
2. Setup and Connection
- Locate the vehicle's 16-pin Data Link Connector (DLC). This is usually found under the dashboard on the driver's side.
- Ensure the vehicle's ignition is in the "OFF" position.
- Firmly plug the KW850's OBD2 connector into the vehicle's DLC.
- Turn the vehicle's ignition to the "ON" position (engine can be off). The scanner will power on automatically.
3. Operating Instructions
Use the ESC, ENTER, and arrow buttons (UP, DOWN) to navigate the menu and select functions.
- Read Codes: Select "Diagnostic" then "Read Codes" to display current, pending, and permanent diagnostic trouble codes (DTCs).
- Erase Codes: After addressing the vehicle's issue, select "Diagnostic" then "Erase Codes" to clear the DTCs and turn off the Malfunction Indicator Light (MIL). Note: Clearing codes without fixing the underlying problem will result in the codes reappearing.
- Live Data: View real-time data stream from the vehicle's sensors. This can be displayed in text or graph format.
- I/M Readiness: Check the status of the emission-related monitors to determine if the vehicle is ready for an emissions test.
- O2 Sensor Test: Retrieve O2 sensor monitor test results.
- On-Board Monitor Test (Mode 6): Retrieve test results for emission-related powertrain components and systems that are not continuously monitored.
- Vehicle Information: Display the vehicle identification number (VIN), calibration ID (CALID), and calibration verification number (CVN).
- BAT Check: Perform a quick check of the vehicle's battery voltage.

Image: The KONNWEI KW850 OBD2 Scanner screen showing a "Pending DTC" for "Cylinder 1 Misfire Detected." This illustrates how the device displays diagnostic trouble codes.

Image: A mechanic is shown using the KONNWEI KW850 OBD2 Scanner while working on a car engine. The scanner's screen displays diagnostic information, indicating its use in vehicle repair and maintenance.
4. Maintenance
- Cleaning: Use a soft, damp cloth to clean the scanner's exterior. Do not use abrasive cleaners or solvents.
- Software Updates: The KW850 supports lifetime free smart updates. Visit the KONNWEI official website for the latest software and instructions on how to update your device.
- Storage: Store the scanner in a clean, dry environment when not in use.
5. Troubleshooting (KW850)
- Scanner does not power on:
- Check the connection to the vehicle's DLC.
- Ensure the vehicle's ignition is in the "ON" position.
- Verify the vehicle's battery has sufficient charge.
- Link Error:
- Verify the ignition is ON.
- Check if the OBD2 connector is securely connected.
- Turn off the ignition, wait 10 seconds, and turn it back on.
- Try connecting to another vehicle to confirm scanner functionality.
- No communication with vehicle:
- Confirm the vehicle is OBDII compliant (most 1996 and newer vehicles).
- Check for blown fuses in the vehicle's fuse box that supply power to the OBD2 port.
6. Specifications (KW850)
- Display: Color LCD
- Operating Voltage: 8V to 18V (from vehicle battery)
- Supported Protocols: J1850 PWM, J1850 VPW, ISO9141-2, KWP2000, CAN
- Connectivity: Standard 16-pin OBD2 connector
- Features: Read/Erase DTCs, Live Data, I/M Readiness, O2 Sensor Test, On-Board Monitor, EVAP System Test, Vehicle Information, Battery Check.
KONNWEI KW510 Battery Charger Tester
1. Product Overview
The KONNWEI KW510 is a multi-functional device that combines a 12V battery tester, a fully automatic battery charger, a battery maintainer (pulse repair), and a battery desulfator. It is designed to provide comprehensive battery health analysis and maintenance.

Image: The KONNWEI KW510 Battery Charger Tester connected to a car battery, displaying its main menu with options like "Battery Test," "Battery Charge," "Battery Repair," and "Setup."

Image: The KONNWEI KW510 Battery Charger Tester shown with graphical icons representing its functions: Battery Test, Battery Charge, and Battery Repair. The device is connected to a car battery in an engine bay.
2. Setup and Connection
- Ensure the KW510 is unplugged from the AC power outlet.
- Connect the RED positive (+) clamp to the positive (+) terminal of the battery.
- Connect the BLACK negative (-) clamp to the negative (-) terminal of the battery.
- Plug the KW510 into a standard AC power outlet (100-240V). The device will power on.
3. Operating Instructions
Use the ESC, ENTER, and arrow buttons (UP, DOWN) to navigate the menu and select functions.
- Battery Test:
- Select "Battery Test" from the main menu.
- Input the battery type (e.g., Regular Flooded, AGM Flat Plate, AGM Spiral, GEL, EFB) and CCA rating as prompted.
- The tester will analyze the battery's health, voltage, internal resistance, and CCA value, then display results like "GOOD-RECHARGE," "REPLACE," etc.
- Cranking Test:
- Select "Cranking Test" and follow on-screen instructions to start the engine.
- The tester will analyze the cranking voltage and time to assess the starter system's performance.
- Charging System Test:
- Select "Charging Test" and follow on-screen instructions to rev the engine.
- The tester will evaluate the alternator's output voltage under load to determine if the charging system is functioning correctly.
- Battery Charge:
- Select "Battery Charge" from the main menu.
- The KW510 will automatically detect the battery type and begin charging. It supports 12V batteries and can charge batteries as low as 2 volts.
- The charger will automatically switch to a trickle charge mode once the battery is fully charged.
- Battery Repair (Pulse Repair):
- Select "Battery Repair" from the main menu.
- This function uses pulse technology to detect and address battery sulfation and acid stratification, aiming to restore battery performance.
- Follow on-screen prompts. This process can take several hours.

Image: The KONNWEI KW510 Battery Charger Tester displaying battery test results, including STD, SOH, SOC, Voltage, and Internal Resistance, with a "GOOD-RECHARGE" status. Icons for Charging Test, Health Status, Voltage Test, Battery Voltage, Cranking Test, Data Storage, CCA, and Resistance Test are also shown.

Image: The KONNWEI KW510 Battery Charger Tester actively charging a car battery, showing the charging percentage (100%), current (0.96A), and voltage (13.41V). Insets show the charger's power (12V/5-Amp, 100-230 Volts) and applications like recharging dead batteries, fixing car start issues, and preventing future problems.

Image: The KONNWEI KW510 Battery Charger Tester displaying a "Battery Repair" countdown. Surrounding icons illustrate its safety features: Smart Control, Temperature Compensation, Reverse Protection, Cooling System, Overcurrent Protection, Fireproof Material, Overvoltage Protection, and Short Circuit Protection.
4. Maintenance
- Cleaning: Wipe the device and clamps with a dry cloth. Do not immerse in water.
- Storage: Store in a cool, dry place. Ensure clamps are clean and free of corrosion before storage.
- Cable Inspection: Regularly inspect the charging cables and clamps for any signs of damage. Replace if necessary.
5. Troubleshooting (KW510)
- Charger not turning on:
- Ensure the AC power cord is securely plugged into a live outlet.
- Check for power outages or tripped circuit breakers.
- "Reverse Polarity" error:
- Disconnect the clamps and re-connect them, ensuring the RED clamp is on the positive (+) terminal and the BLACK clamp is on the negative (-) terminal.
- Battery not charging:
- Verify battery clamps are making good contact with battery terminals.
- Ensure the battery voltage is above 2V for the charger to initiate.
- The battery may be severely damaged and unable to accept a charge.
- Inaccurate test results:
- Ensure battery terminals are clean and free of corrosion.
- Verify correct battery type and CCA rating are entered during the test.
6. Specifications (KW510)
- Input Voltage: 100-240V AC, 50/60Hz
- Output Voltage: 12V DC
- Output Current: Max 5A
- Minimum Start Voltage: 2.0V
- Battery Range: 4Ah - 100Ah
- Supported Battery Types: All 12V Lead-Acid batteries (Flooded, GEL, AGM, EFB, etc.)
- Functions: Battery Test, Cranking Test, Charging System Test, Battery Charge, Pulse Repair.
Warranty and Support
KONNWEI products typically come with a manufacturer's warranty. Please refer to the warranty card included with your product or visit the official KONNWEI website for detailed warranty terms and conditions.
For technical support, troubleshooting assistance, or inquiries regarding your KONNWEI KW850 or KW510, please contact KONNWEI customer service through their official website or the contact information provided in your product packaging.
Official KONNWEI Website: www.konnwei.com





