KONNWEI KW905 Bluetooth Car OBD2 Scanner User Manual

1. Introduction

The KONNWEI KW905 is a compact and portable Bluetooth 5.0 OBD2 car diagnostic scanner. It is designed to connect wirelessly to your iOS or Android smartphone via the dedicated MAXOBD app, providing comprehensive diagnostic capabilities for your vehicle. This device allows you to quickly identify and understand vehicle issues by reading and clearing diagnostic trouble codes (DTCs), monitoring live sensor data, performing various system tests, and checking battery health.

The KW905 is compatible with all 12V gasoline and diesel vehicles manufactured from 1996 onwards that are OBD2 certified. It features a convenient ON/OFF switch to conserve power and supports high-speed communication for efficient data transfer.

KONNWEI KW905 Bluetooth Car OBD2 Scanner with MAXOBD app interface showing various diagnostic functions. Note: Deep security Scan and Vehicle-Specific Data Stream are not currently supported on KW905.

2. Safety Information

Please read and understand all instructions before operating this device. Failure to follow these instructions may result in damage to the device, vehicle, or personal injury.

Always operate the device in a well-ventilated area.
Do not wear loose clothing or jewelry when working near the engine.
Keep the device away from water, oil, and other liquids.
Ensure the vehicle is in Park (P) or Neutral (N) with the parking brake engaged before connecting or disconnecting the device.
Do not attempt to disassemble or modify the device.
Follow the product instructions for operation carefully.

3. Package Contents

Your KONNWEI KW905 package should include the following items:

KONNWEI KW905 Bluetooth OBD2 Scanner (available in Red, Orange, or Black)
User Manual
Small storage box (packaging)

Image showing the three available colors for the KONNWEI KW905: Red, Orange, and Black — The KW905 is available in Red, Orange, and Black.

4. Specifications

KONNWEI KW905 Product Parameters
Parameter	Description
Product Name	Car OBD2 Scanner
Product Number	KW905
Bluetooth Version	5.2
Dimensions	Approx. 5 cm (1.97 in) x 4 cm (1.57 in) x 2.3 cm (0.906 in)
Features	Read Codes, Erase Codes, O2 Sensor Test, On-Board Monitoring, I/M Readiness, Evap System, Data Stream, Vehicle Information, Freeze Frame, Battery Voltage Test
Application	All 12V Gasoline And Diesel Vehicles/Hybrid Electric Vehicles (1996 and later, OBD2 certified)
Supporting Device	iOS and Android smartphones
Settings	Language set, Share Data
Supported Protocols	ISO 9141, KWP2000, SAE J1850, CAN, J1850 VPW, J1850 PWM
Unsupported Vehicles	24V Heavy duty diesel cars
Supported Languages	Chinese, English, French, German, Russian, Spanish, Italian, Polish

Product parameter table for KONNWEI KW905 OBD2 scanner — Detailed product parameters and dimensions of the KW905.

Compatibility information for KONNWEI KW905, supporting 120+ manufacturers and 13,596+ models from 1996 onwards, with language support — KW905 compatibility with various vehicle manufacturers and models, and supported languages.

5. Setup Guide

5.1 App Installation

The KONNWEI KW905 requires the MAXOBD app for operation. This app is available for free download on both iOS and Android platforms.

For iOS devices: Search for "MAXOBD" in the Apple App Store and download.
For Android devices: Search for "MAXOBD" in the Google Play Store and download.

MAXOBD app download options for App Store and Google Play, highlighting Bluetooth 5.2 connectivity for the KONNWEI KW905 — Download the MAXOBD app from your device's app store.

5.2 Device Connection and Pairing

Follow these steps to connect your KW905 scanner to your vehicle and pair it with your smartphone:

Step 1: Download the MAXOBD APP. Ensure the app is installed on your iOS or Android device.
Step 2: Connect the MAXOBD Tool to the Car's OBDII Port. Locate your vehicle's 16-pin OBDII diagnostic port, usually found under the dashboard on the driver's side. Plug the KW905 scanner firmly into this port.
Step 3: Turn on the KW905. Use the ON/OFF switch on the device to power it on. The indicator lights will illuminate.
Step 4: Directly connect to Bluetooth in the APP. Open the MAXOBD app on your smartphone. Within the app, navigate to the connection or Bluetooth settings. Select the KW905 from the list of available Bluetooth devices to pair.

Three-step guide for easy pairing of KONNWEI KW905 to iOS and Android devices — Visual guide for connecting and pairing the KW905.

Video demonstrating the setup and usage of the KONNWEI KW905 OBD2 scanner with the MAXOBD app, including connection and pairing.

6. Operating Instructions

Once connected, the MAXOBD app provides access to various diagnostic functions. Navigate through the app interface to utilize the following features:

Grid display of KONNWEI KW905 OBDII functions including Read Codes, Erase Codes, Vehicle Information, and more — Overview of the KW905's OBDII functions.

6.1 Core Diagnostic Functions

Read Codes: Retrieves Diagnostic Trouble Codes (DTCs) from the vehicle's computer, indicating potential issues.
Erase Codes: Clears DTCs from the vehicle's computer and turns off the Check Engine Light (MIL).
Live Data Stream: Displays real-time data from various vehicle sensors, such as vehicle speed, RPM, engine coolant temperature, fuel pressure, calculated engine load, throttle position, intake manifold pressure, air intake temperature, timing advance, mass air flow, fuel level, barometric pressure, EVAP system vapor pressure, and fuel trim.
I/M Readiness: Checks the status of emission-related monitoring systems to determine if they are ready for an emissions test.
Freeze Frame: Records a snapshot of vehicle operating conditions at the moment a fault code was set.
O2 Sensor Test: Retrieves O2 sensor monitoring test results for the most recently completed tests.
On-Board Monitoring: Retrieves results for on-board diagnostic monitoring tests for specific components/systems.
EVAP System (Mode$8): Initiates a test of the Evaporative Emission Control System.
Vehicle Information: Displays the vehicle identification number (VIN), calibration ID (CID), and calibration verification number (CVN).
DTC Lookup: Provides definitions for generic and manufacturer-specific diagnostic trouble codes.
Dashboard: Customizable display of live data in a gauge format.
OBD Diagnostic Report: Generates a comprehensive report of the vehicle's diagnostic status.

Comparison of car dashboard with check engine light on before and off after using KONNWEI KW905 to erase codes — The KW905 can clear the Check Engine Light after resolving issues.

Detailed view of KONNWEI KW905 app functions including Fault Details, I/M Readiness, Dashboard, Settings, and OBD Diagnostic Report — Screenshots of the MAXOBD app showing various diagnostic screens.

6.2 Battery Testing

The KW905 supports battery voltage testing to quickly display your car battery data.

Navigate to the "Battery Testing" section in the MAXOBD app.
The app will display current, maximum, and minimum battery voltage readings.
Note: This function may require restarting the vehicle after it is turned off to ensure more accurate test results. Follow on-screen prompts.

Screenshots of KONNWEI KW905 MAXOBD app displaying I/M Readiness, Battery Testing, and Dashboard functions — Battery testing interface within the MAXOBD app.

7. Troubleshooting

Device not powering on: Ensure the KW905 is firmly plugged into the vehicle's OBDII port and the vehicle's ignition is on (or engine running, depending on the test). Check the ON/OFF switch on the device.
Bluetooth connection issues: Make sure Bluetooth is enabled on your smartphone. Close and reopen the MAXOBD app. Try restarting both your phone and the KW905 device. Ensure no other Bluetooth devices are interfering.
App not detecting vehicle: Verify that your vehicle is OBD2 compliant (1996 or newer, 12V gasoline/diesel/hybrid). Ensure the KW905 is securely connected to the OBDII port. Try turning the vehicle's ignition off and on again.
"Vehicle does not support" message for certain functions (e.g., O2 Sensor Test): Some advanced functions or specific sensor data may not be supported by all vehicle makes, models, or years. This is normal and does not indicate a fault with the KW905.
"Deep security Scan" and "Vehicle-Specific Data Stream" not available: These specific functions are explicitly noted as not currently supported on the KW905.
Inaccurate readings: Ensure the vehicle's engine is at operating temperature for accurate sensor readings. If readings seem consistently off, try recalibrating or restarting the app and device.

8. User Tips

While no specific user reviews or Q&A were provided for this manual, here are some general tips for using your OBD2 scanner effectively:

Keep the App Updated: Regularly check for updates to the MAXOBD app to ensure you have the latest features and bug fixes.
Understand DTCs: When a Diagnostic Trouble Code appears, use the app's DTC Lookup feature or an online resource to understand what the code means before attempting any repairs.
Monitor Live Data: Use the Live Data Stream function to observe sensor readings in real-time. This can help diagnose intermittent problems or verify repairs.
Battery Health Check: Periodically use the Battery Testing feature to monitor your vehicle's battery health, especially before long trips or in extreme weather.
Power Off When Not in Use: Utilize the KW905's ON/OFF switch to power down the device when not actively diagnosing to prevent unnecessary battery drain on your vehicle.

9. Maintenance

Cleaning: Wipe the device with a soft, dry cloth. Do not use abrasive cleaners or solvents.
Storage: Store the KW905 in a cool, dry place, away from direct sunlight and extreme temperatures. Keep it in its original packaging or a protective case when not in use.
Avoid Drops: Handle the device with care to prevent damage from drops or impacts.

Diagram showing the power switch and indicator lights on the KONNWEI KW905 for one-touch shutdown — The KW905 features a power switch for easy shutdown and no battery consumption when off.

10. Warranty and Support

KONNWEI products are designed for reliability and performance. For warranty information, technical support, or service inquiries, please refer to the contact information provided with your product packaging or visit the official KONNWEI website.

Always ensure you are using official KONNWEI resources for support to receive accurate and reliable assistance.

KONNWEI KW905 ELM327 V1.5