1. Introduction
The MAIMEIMI P4 is an advanced OBD2 and GPS dual-system Head-up Display (HUD) designed to provide comprehensive vehicle data directly in your line of sight. It combines OBD2 vehicle data with GPS information and a 4x4 slope meter, offering a wide range of monitoring capabilities and safety features. With its 6.2-inch high-definition LCD screen and customizable display styles, the P4 enhances your driving experience by providing critical information such as speed, RPM, water temperature, fuel consumption, and various alarm functions.
Video: P4 HUD Product Overview and Features
2. Package Contents
Please verify that all items are present in your package:
- 1 x P4 HUD Unit
- 1 x Adjustable Bracket
- 1 x Type-C OBD Cable
- 1 x Non-slip Mat
- 1 x User Manual (this document)
Image: P4 HUD Product Accessories
3. Setup and Installation
3.1. OBD2 Compatibility Check
The P4 HUD supports both OBD2 and EUOBD (On-Board Automatic Diagnosis System) protocols. It is designed for plug-and-play operation with compatible vehicles.
Judgment Method:
- Check for an OBD2 CERTIFIED sticker under the hood (as shown in Figure 1 below).
- Locate the automobile diagnosis port under the steering wheel (as shown in Figure 2 below).
Note: U.S. cars can typically use the device if produced after 2003, and most other cars if produced after 2007.
Image: OBD2 Installation Guide
3.2. Incompatible Vehicle Models
The P4 HUD is NOT compatible with the following common vehicle models:
- American models: Not for Dodge, JEEP, Sail, Chrysler (models produced before 2004 and 2004).
- French and Italian models: Not for Fiat, Maserati, Lamborghini, DS, Peugeot, Citroen, Renault, Simka, Amirca, etc.
- Japanese models: Not for Suzuki, Mazda 6, Infiniti (QX50, Q50, Q501), 2013 Toyota Avanza, Lexus (IS250, EX250, ES300H), Honda (Jazz, CRV), and cars produced before 2008.
- Some South Korean models: Not for Kia and Hyundai (e.g., 2013 Hyundai Sonata, 2017 Kia Soul PS).
- Other: Petrol-electric hybrid and diesel vehicles, pickup trucks, RVs, cars modified with car computers, all brand models under Swiss Volvo, Chrysler Group, and Fiat Group.
3.3. Installation Steps
- Connect the OBD Cable: Plug the Type-C OBD cable into your vehicle's OBD2 port.
- Route the Cable: Carefully route the cable along the dashboard and A-pillar to conceal it and prevent interference with driving.
- Position the HUD: Place the P4 HUD unit on your instrument panel or hang it on the windshield using the adjustable bracket and non-slip mat. Ensure it is stable and does not obstruct your view.
- Power On: The device will power on automatically when connected to the OBD2 port and the car is started.
Video: P4 HUD In-Car Demonstration and Installation Overview
Image: Multiple Installation Methods
4. Operating Instructions
4.1. Interface and Display Modes
The P4 HUD offers multiple interface display designs and custom functions that can be switched at will. It features a 6.2-inch high-definition LCD screen for optimal viewing.
Image: New Interface Display Design
4.2. Language Settings
The all-language function setting is easy to understand, and the full-vehicle data terminology is available in multiple languages.
Image: Multiple Languages Selection
4.3. Atmosphere Lighting
The P4 HUD features colorful breathing atmosphere lights that can be customized. You can choose from various themes or set the light to change with engine speed or car speed.
- Colorful combination atmosphere light: Choose your favorite combination color (multiple colors can be switched).
- Speed atmosphere light: Changes with engine speed (default) or car speed (green, blue, yellow, red).
- Always bright atmosphere light: Freely choose your preferred color.
- Option to turn on/off the atmosphere light.
Image: Colorful Breathing Atmosphere Light Options
5. Features and Functions
5.1. OBD2 Mode Functions
When connected via OBD2, the P4 HUD can display a wide array of vehicle data:
- Vehicle speed, RPM, Water temperature, Voltage
- Fuel consumption time, Average fuel consumption
- Single driving time, Single driving distance, Total mileage, Cumulative driving direction
- Longitude and latitude, Kilometers per liter, Intake pressure, Oil temperature, Air fuel ratio
- Turbine pressure, Intake temperature, Oil pressure, Throttle valve, Engine load, Transmission oil temperature
- Satellite number, Altitude, Accelerometer, G value
- Up and down slope angle, Left and right slope angle
- Acceleration test, Braking test
- Reading rich PID data flow, Reading and Clearing car fault codes
Image: OBD2 System - Multiple Data Monitoring
Image: Read Whole ECU Data
Image: PID List - Display Trip Computer ECU Data
5.2. GPS Mode Functions
For vehicles not compatible with OBD2 or for additional data, the GPS mode provides:
- Vehicle speed, Voltage, Time
- Single driving time, Single driving distance, Total mileage, Cumulative driving direction
- Longitude and latitude, Satellite number, Altitude
- Accelerometer G value, Up and down slope angle, Left and right slope angle
- Acceleration test, Braking test
Image: GPS + Beidou Global Satellite Positioning System
5.3. Electronic Inclinometer (Off-road Vehicle Data)
The P4 HUD includes a high-precision electronic level that monitors vehicle posture changes in real-time, ensuring driving safety. A high-performance 6-axis gyroscope sensor ensures accurate data for off-road exploration.
- Pitch angle: -40° to 40° (Up and down slope)
- Roll angle: -40° to 40° (Tilt left and right)
- Compass
Image: Electronic Inclinometer
Image: Off-road Vehicle Data
5.4. Alarm Functions
The P4 HUD features a pop-up window alarm design that directly displays alarm symbols and parameters with prompt sounds to improve driving safety. It includes ten critical alarm functions:
- Overspeed alarm
- RPM alarm
- Water temperature alarm
- Voltage alarm
- Turbo pressure alarm
- Gearbox oil temperature alarm
- Oil temperature alarm
- Oil pressure alarm
- Pitch angle alarm
- Roll angle alarm
Image: Pop-up Window Alarm
Image: Pop-up Window Alarm Details
Image: Ten Alarm Functions
5.5. Performance Testing
The P4 HUD provides professional performance parameters and real-time data recording:
- 100 km/h Acceleration Test: Real-time acceleration curve drawing and recording the best time.
- 100 km/h Brake Test: Real-time drawing of braking curve and recording of shortest time and distance.
- Turbo Pressure Test: Displays turbo data in real-time, with clear turbo intervention time.
Disclaimer: Please conduct performance tests on a safe and closed road, accompanied by professionals.
Image: More Professional Performance Testing
5.6. Vehicle Accelerometer (G-Value Table)
The P4 HUD provides a simple and intuitive G-value display. A larger G-value indicates stronger acceleration and deceleration performance, better power, and improved cornering control. This feature is essential for racing cars, luxury cars, and performance cars.
- Longitudinal G value: Acceleration G value and braking G value.
- Vertical and horizontal G value: Left and right turning G value.
Note: Non-professionals please do not try!
Image: Vehicle Accelerometer G-Value Table
6. Specifications
| Attribute | Value |
|---|---|
| Model | P4 |
| Brand Name | MAIMEIMI |
| Speed Type | OBD vehicle speed, GPS speed |
| Wire or Wireless | Wired |
| Size Name | EU OBD interface (196mm x 90mm x 65mm) |
| Material | Plastic, electronic components |
| Speed Unit | KMH, MPH |
| Display Screen | 6.2-inch high-definition LCD, 18:9 widescreen |
| Processor | 9th generation dual-core dual chip |
| Product Weight | 120g |
| Packing Box Size | 15cm x 6cm x 9cm |
| Package Weight | 218g |
Image: P4 HUD Dimensions and Interfaces
Image: P4 HUD Design Details and Dimensions
7. Troubleshooting
7.1. Compatibility Issues
If your P4 HUD is not displaying data or functioning correctly, first verify your vehicle's OBD2 compatibility. Refer to section 3.1 and 3.2 for detailed compatibility information. If your vehicle is listed as incompatible or is an older model, the OBD2 system may not work. In such cases, the GPS mode can still provide essential driving data.
7.2. General Malfunctions
- No Power: Ensure the OBD2 cable is securely connected to both the HUD and the vehicle's OBD2 port. Check if the vehicle's ignition is on.
- Incorrect Data Display: Verify that the correct mode (OBD2 or GPS) is selected based on your vehicle's compatibility. If in OBD2 mode, ensure your vehicle supports the displayed parameters.
- Screen Freezing/Unresponsive: Disconnect the HUD from the OBD2 port, wait a few seconds, and then reconnect it. This will perform a soft reset.
- Alarms Not Functioning: Check the system settings to ensure alarm functions are enabled and configured correctly.
8. User Tips
- Check Compatibility for Older Vehicles: For vehicles manufactured around 2008 or earlier, especially American, French, Italian, and some Japanese/Korean models, always double-check OBD2 compatibility using the methods described in section 3.1. If OBD2 is not supported, the GPS mode will still provide valuable speed and navigation data.
- Customize Display: Experiment with the 7 different display styles and various atmosphere light settings to find the combination that best suits your driving preferences and interior aesthetics.
- Secure Installation: Use the provided non-slip mat and adjustable bracket to ensure the HUD is securely mounted and does not move during driving, maintaining clear visibility.
- Regular Updates: The manufacturer regularly provides system updates to add special vehicle support, themes, and optimizations. Check for available updates to ensure optimal performance.
9. Warranty and Support
For any issues, questions, or support needs regarding your MAIMEIMI P4 HUD, please contact the seller or manufacturer directly. Provide your product model and a detailed description of the issue for efficient assistance.
