KONNWEI KW901 ELM327 V1.5 Bluetooth 5.0 OBD2 Car Diagnostic Tool User Manual

1. Introduction

The KONNWEI KW901 ELM327 V1.5 Bluetooth 5.0 OBD2 Car Diagnostic Tool is a high-quality automotive scanning device designed to read and clear diagnostic trouble codes (DTCs) and display real-time sensor data from your vehicle. It supports all OBD-II protocols and is compatible with both Android and iOS devices via Bluetooth 5.0.

2. Safety Information

WARNING: Please strictly follow the instructions, safety tips and use the product with caution.

• Ensure the vehicle is in a safe, stationary position before connecting or operating the device.
• Do not attempt to operate the device while driving.
• Always ensure proper connection to the OBD-II port to avoid damage to the device or vehicle.
• Keep the device away from water, extreme temperatures, and direct sunlight.

3. Package Contents

The package includes the following items:

• 1x KW902 Wireless BT5.0 scanner (pic18f25k80 chip set)
• 1x English User Manual (This document)

4. Specifications

4.1 Supported OBD-II Protocols

• SAE J1850 PWM (41.6 Kbaud)
• SAE J1850 VPW (10.4 Kbaud)
• ISO9141-2 (5 baud init, 10.4 Kbaud)
• ISO14230-4 KWP (5 baud init, 10.4 Kbaud)
• ISO14230-4 KWP (fast init, 10.4 Kbaud)
• ISO15765-4 CAN (11bit ID, 500 Kbaud)
• ISO15765-4 CAN (29bit ID, 500 Kbaud)
• ISO15765-4 CAN (11bit ID, 250 Kbaud)
• ISO15765-4 CAN (29bit ID, 250 Kbaud)
• SAE J1939 CAN (29bit ID, 250 * Kbaud)
• USER1 CAN (11* bit ID, 125 * Kbaud)
• USER2 CAN (11* bit ID, 50 * Kbaud)

* Default Settings (User Adjustable)

5. Setup and Connection

5.1 App Download

To use the KONNWEI KW901, you need a compatible OBD-II diagnostic application on your smartphone or tablet. Recommended apps include "OBD Auto Doctor" or "Torque".

5.2 Physical Connection

1. Locate your vehicle's OBD-II port. This is usually found under the dashboard on the driver's side.
2. Ensure the vehicle's ignition is OFF.
3. Plug the KW901 device firmly into the OBD-II port.
4. Turn the vehicle's ignition to the ON position (engine can be off).
5. Press the power button on the KW901 device. The indicator lights should illuminate.

Video 1: Demonstration of connecting the KW901 to the OBD-II port and powering it on.

5.3 Bluetooth Pairing and App Connection

For Android Devices:

The KW901 supports Bluetooth 5.0 Dual Mode. For Android, you will typically pair the device via your phone's Bluetooth settings first, then connect within the app.

1. Go to your Android phone's Bluetooth settings.
2. Turn on Bluetooth.
3. Search for available devices and select "KONNWEI" or "V-LINK".
4. If prompted, enter the default password "1234". The device should show as paired.
5. Open your chosen OBD-II app (e.g., Torque).
6. Navigate to the app's settings (often labeled "OBD II Adapter Settings" or "Connection").
7. Select "Bluetooth" as the connection type.
8. Choose "KONNWEI" or "V-LINK" as the Bluetooth device.
9. Exit the app completely and then re-open it.
10. On the app's main screen, click the "Connect" button. The device should connect, and the app will display "ELM connection: Connected" and "ECU connection: Connected".

For iOS Devices:

IMPORTANT: For iOS, do NOT connect to Bluetooth in your phone's settings. Connect directly within the diagnostic app.

1. Plug the KW901 into the OBD2 interface and ensure it's powered on.
2. Open your iPhone's Bluetooth settings, but do NOT attempt to pair the device there.
3. Open your chosen OBD-II app (e.g., OBD Auto Doctor, Accurate app).
4. In the app, navigate to "Extras" (or similar settings menu).
5. Select "Connectivity" and then choose "Bluetooth".
6. Select "Bluetooth LE (5.0)" as the connection type. If your phone app shows Bluetooth 4.0, you can select that too.
7. Click "Device" and choose "Konnwei".
8. Return to the app's home page and click the "Connect" icon (often in the upper right corner).
9. Wait approximately ten seconds for the connection to establish. The app should display "ELM connection: Connected" and "ECU connection: Connected".

6. Operation

Once connected, the KONNWEI KW901 allows you to perform various diagnostic functions through your chosen OBD-II app.

6.1 Key Functions

• **Read Diagnostic Trouble Codes (DTCs)**: View both generic and manufacturer-specific codes, along with their meanings (over 3000 definitions in the database).
• **Clear Trouble Codes**: Turn off the Malfunction Indicator Light (MIL), also known as the "Check Engine" light.
• **Real-time Sensor Data Display**: Monitor various parameters including:
  • Engine RPM
  • Calculated Load Value
  • Coolant Temperature
  • Fuel System Status
  • Vehicle Speed
  • Short Term Fuel Trim
  • Long Term Fuel Trim
  • Intake Manifold Pressure
  • Timing Advance
  • Intake Air Temperature
  • Air Flow Rate
  • Absolute Throttle Position
  • Oxygen sensor voltages/associated short term fuel trims
  • Fuel Pressure
  • And many others...
• **Data Logging**: Record sensor data for later analysis.
• **Vehicle Information**: Access information about your vehicle.

7. Maintenance

• Keep the device clean and free from dust and moisture.
• Store the device in a cool, dry place when not in use.
• Avoid dropping or subjecting the device to strong impacts.
• Do not attempt to disassemble or repair the device yourself, as this will void the warranty.

8. Troubleshooting

8.1 Device cannot find the "KONNWEI" Bluetooth network

• Check if the adapter is powered on (press the button on the front panel).
• Verify the power supply of your OBD-II connector; it should provide 12-14 volts.
• Ensure the car ignition is in the ON position.
• Try turning off the ignition, removing the adapter from the socket, reinserting it, and then turning the ignition back on.
• Attempt searching for the Bluetooth network using another smartphone, laptop, or tablet to rule out device-specific issues.

8.2 Adapter disconnects during operation

• Ensure that high-power devices are not being charged through the cigarette lighter during adapter operation, as this can cause voltage fluctuations.
• Strong voltage surges in the car's electrical network can affect stability. Confirm the OBD-II connector outputs a stable 12-14 volts.

8.3 The adapter cannot connect to the ECU

• Some ECUs may require additional add-ons or an initialization code for correct connection. Many applications have a ready-made list of codes for various car brands.
• Try using different OBD-II applications, as they may utilize protocols differently to communicate with the ECU.
• Ensure that only one adapter application is running at a time on your device.
• Attempt the connection process again from step 1 (physical connection and Bluetooth pairing).

9. User Tips

• **iOS Connection**: Remember, for iOS devices, do NOT pair the device in your phone's main Bluetooth settings. Always initiate the connection directly from within your chosen OBD-II diagnostic app (e.g., OBD Auto Doctor, Accurate app).
• **App Compatibility**: While "OBD Auto Doctor" and "Torque" are commonly used, explore other OBD-II apps available on your device's app store to find one that best suits your needs and vehicle.
• **Firmware Updates**: Check the manufacturer's website or app for any available firmware updates for the KW901 to ensure optimal performance and compatibility.

10. Warranty and Support

For warranty information, technical support, or further assistance, please refer to the official KONNWEI website or contact your retailer. Keep your purchase receipt as proof of purchase.

A detailed user manual in PDF format is also available for download: User manual (PDF)