1. Introduction
The DonosHome DH77 is an advanced 4-in-1 diagnostic tool designed for automotive enthusiasts and professionals. It combines the functionalities of a comprehensive OBD2/EOBD scanner with a precise battery tester, offering a complete solution for vehicle health monitoring. This manual provides detailed instructions for setting up, operating, and maintaining your DH77 device.
Figure 1.1: DonosHome DH77 Device Overview
2. Product Features
- 4-in-1 Functionality: Integrates OBD2/EOBD diagnostic scanning and professional battery testing.
- Wide Battery Compatibility: Supports 5-36V batteries from 20 to 3300 CCA, including Regular Flooded, AGM Flat Plate, AGM Spiral, GEL, EFB, and Lithium types.
- Comprehensive OBD2 Functions: Includes Read/Erase Codes, Live Data Stream, Freeze Frame, I/M Readiness, O2 Sensor Test, EVAP System Test, On-Board Monitoring, DTC Lookup, and VIN Information.
- Accurate Battery Analysis: Provides precise measurements of voltage, internal resistance, cold start, battery health, and charging status with over 99.8% accuracy.
- Advanced Waveform Rendering: Features crank waveform diagram and real-time waveform diagram functions for both OBD2 and battery testing, aiding in system performance analysis.
- User-Friendly Design: Equipped with a 3.2-inch LCD color screen and 7 large rubber buttons for easy navigation and clear reading.
- One-Key Test and DTC Lookup: Allows quick access to readiness status and trouble codes with a built-in library of over 30,000 DTC definitions.
- Broad Vehicle Compatibility: Supports 99% of American cars since 1996, European cars after 2003, and Asian cars from 2008.
- Multi-language Support: Supports 11 languages for global usability.
Figure 2.1: Professional OBD2 Scanner Functions
Figure 2.2: Battery Tester Capabilities
Figure 2.3: Language and Compatibility Overview
3. Package Contents
Upon opening the package, please verify that all items listed below are present and in good condition:
- DonosHome DH77 Main Unit
- OBD2 Cable (108 cm / 42.52 inches)
- Detachable Battery Test Cable with Alligator Clips (50 cm / 20.87 inches)
- User Manual (available in 5 languages)
Figure 3.1: DH77 Package Contents
4. Setup
4.1 Powering On the Device
The DH77 does not have an internal battery for standalone power. It powers on automatically when connected to a vehicle's OBD2 port or battery.
4.2 Connecting for OBD2 Diagnostics
- Locate the vehicle's 16-pin OBD2 diagnostic link connector (DLC). This is usually found under the dashboard on the driver's side.
- Plug the OBD2 cable from the DH77 into the vehicle's DLC.
- The DH77 will power on automatically and display the main menu.
4.3 Connecting for Battery Testing
- Ensure the vehicle's ignition is off.
- Connect the red alligator clip of the battery test cable to the positive (+) terminal of the vehicle's battery.
- Connect the black alligator clip of the battery test cable to the negative (-) terminal of the vehicle's battery.
- The DH77 will power on automatically and display the battery test menu.
Figure 4.1: Physical Features and Connections
5. Operating Instructions
5.1 Navigating the Menu
Use the directional arrow buttons (Up, Down, Left, Right) to navigate through menu options. Press the OK button to confirm a selection and the ESC button to return to the previous screen.
5.2 OBD2 Diagnostic Functions
After connecting the DH77 to the vehicle's OBD2 port, select 'Diagnose' from the main menu to access the following functions:
- Read Codes: Displays current, pending, and permanent Diagnostic Trouble Codes (DTCs).
- Erase Codes: Clears DTCs from the vehicle's computer and turns off the Check Engine Light (MIL). Ensure the issue causing the code is resolved before clearing.
- Live Data: Displays real-time parameters from the vehicle's sensors in text or graph format.
- Freeze Frame: Shows a snapshot of vehicle operating conditions at the time a fault code was set.
- I/M Readiness: Checks the readiness of emission-related monitors. A quick '1-Key I/M' test is also available.
- O2 Sensor Test: Retrieves O2 sensor monitoring test results.
- EVAP System Test: Initiates a test of the Evaporative Emission Control System.
- On-Board Monitoring: Retrieves results for on-board diagnostic monitoring tests of specific components/systems.
- DTC Lookup: Provides detailed definitions for generic and manufacturer-specific DTCs.
- VIN Information: Displays the Vehicle Identification Number and other relevant vehicle information.
- Waveform: Visualizes real-time data streams as waveforms for detailed analysis.
Figure 5.1: Full Engine System Test Interface
Figure 5.2: Core OBD2 Functions
5.3 Battery Tester Functions
After connecting the DH77 to the vehicle's battery, select 'Battery Tester' from the main menu to access the following functions:
- Battery Test: Performs a comprehensive analysis of the battery's health, including State of Health (SOH), State of Charge (SOC), voltage, and internal resistance.
- Cranking Test: Measures the battery's ability to crank the engine, providing insights into its starting power.
- Charging Test: Evaluates the vehicle's charging system (alternator, rectifier, etc.) to ensure proper charging voltage.
- Ripple Test: Analyzes the AC ripple voltage from the alternator, indicating potential issues with the rectifier.
- Voltage Test: Displays the current battery voltage.
- Waveform: Displays real-time voltage waveforms during cranking and charging for detailed analysis.
Figure 5.3: Accurate Battery Test Results
Figure 5.4: Battery Test Result Interpretations
6. Maintenance
- Cleaning: Use a soft, damp cloth to clean the device. Do not use abrasive cleaners or solvents.
- Storage: Store the DH77 in a dry, cool place away from direct sunlight and extreme temperatures.
- Cable Care: Avoid bending or twisting the cables excessively. Store them neatly to prevent damage.
- Software Updates: Check the DonosHome official website periodically for software updates to ensure optimal performance and compatibility.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Device does not power on. | Incorrect connection; Vehicle's OBD2 port or battery has no power. | Ensure the OBD2 cable or battery clips are securely connected. Check vehicle's battery voltage. |
| Communication error with vehicle. | Loose connection; Vehicle not OBD2 compliant; Ignition off. | Verify cable connection. Ensure vehicle ignition is ON (engine off or running as required by test). Confirm vehicle is OBD2 compliant. |
| Inaccurate battery test results. | Poor connection to battery terminals; Battery not fully charged. | Clean battery terminals and ensure clips are firmly attached. Fully charge the battery before testing. |
| Screen is frozen or unresponsive. | Software glitch. | Disconnect the device from the vehicle/battery, wait a few seconds, then reconnect. |
8. Specifications
- Model: DH77
- Display: 3.2-inch Color LCD (320x240 resolution)
- Operating Voltage: 5V - 36V
- Battery Test Range: 20 - 3300 CCA
- Product Dimensions: 14.45 x 7.1 x 2.2 cm
- Item Weight: 400 g
- Operating Temperature: -25°C to 75°C (-13°F to 167°F)
- Storage Temperature: -30°C to 80°C (-22°F to 176°F)
- OBD2 Cable Length: 108 cm
- Battery Test Cable Length: 50 cm
Figure 8.1: Internal Chip Technology and Temperature Range
9. Warranty and Support
DonosHome products are designed for reliability and performance. For any technical assistance, warranty claims, or product inquiries, please contact DonosHome customer support through the official website or your purchase platform. Please have your product model number (DH77) and purchase details ready when contacting support.
