ELM327 V1.5 (PIC18F25K80) – OBD2 Bluetooth 4.0 Car Scanner for iOS/Android/Windows

Introduction

This ELM327 V1.5 adapter is based on the PIC18F25K80, which is the most sought-after hardware in the ELM327 class. It provides stable communication with both older OBD-II protocols (ISO9141-2/KWP2000) and modern CAN variants (11/29-bit). Bluetooth 4.0 (BLE) offers energy-efficient and fast connectivity, especially useful on iOS where older BT profiles are often missing.

The device is suitable for quick diagnostics (DTC, MIL), pre-inspection checks (I/M), live data logging, and daily monitoring. You can easily save logs and generate reports in your chosen app. Thanks to the "universal" ELM-AT command set, the adapter works with a wide range of apps on different platforms.

Specifications

• Hardware: ELM327 V1.5, PIC18F25K80
• Communication: Bluetooth 4.0 (BLE)
• Platforms: iOS / Android / Windows (Symbian may work with older apps)
• Operating Voltage: 9–16 V (via car’s OBD2 port)
• Operating Current: approx. 35 mA
• Sleep Current: approx. 25 mA
• Operating Environment: −40 °C to +85 °C, RH < 60 %
• Size: approx. 4.3 × 3.0 × 2.5 cm (mini)
• Main Chip: PIC18F25K80 (stable timing, high compatibility)
• Vehicle Interface: 16-pin OBD2 (male)
• LED Indication: Power/Communication (model-dependent)

Features & Use Cases

• Read & Clear DTCs: Support for generic (P0xxx) and many manufacturer-specific codes (P1xxx etc.). Turn off MIL after repair.
• Live Data: Display real-time parameters (ECT, RPM, STFT/LTFT, MAP/MAF, speed, IAT, TPS, O2 voltage, etc.).
• Freeze-Frame: View sensor data exactly when the fault was registered.
• I/M Readiness: Check emission monitors (catalyst, O2, EGR, EVAP etc.) for inspection readiness.
• VIN/CALID/CVN: Vehicle and calibration ID via Mode $09 (where the vehicle exposes it).
• Log & Report: Most apps can log and export CSV/PDF for traceable troubleshooting.
• Fuel/Consumption: Some apps calculate consumption based on OBD data.

NOTE: OBD2 primarily refers to engine/emission (Mode $01–$0A). ABS/airbag/BCM/comfort often require brand-specific functions in the app/tool.

Compatibility & OBD2 Protocols

Suitable for OBD2/EOBD vehicles with a 16-pin DLC. General guidelines (Europe): petrol approx. 2001+, diesel approx. 2004+. USA petrol 1996+. Some 1994–1995 vehicles may be OBD-II certified – check the VECI label under the hood and ensure a 16-pin DLC is present.

Supported Protocols (9 types)

1. SAE J1850 PWM (41.6 kbaud)
2. SAE J1850 VPW (10.4 kbaud)
3. ISO 9141-2 (5-baud init, 10.4 kbaud)
4. ISO 14230-4 KWP (5-baud init, 10.4 kbaud)
5. ISO 14230-4 KWP (fast init, 10.4 kbaud)
6. ISO 15765-4 CAN (11-bit ID, 500 kbaud)
7. ISO 15765-4 CAN (29-bit ID, 500 kbaud)
8. ISO 15765-4 CAN (11-bit ID, 250 kbaud)
9. ISO 15765-4 CAN (29-bit ID, 250 kbaud)

V1.5 vs V2.1 & Connection Types

V1.5 (PIC18F25K80) versus V2.1

There are many variants of ELM327 on the market. A common distinction is between V1.5 and V2.1. In practice, many prefer V1.5 with PIC18F25K80 for better compatibility with older protocols. The table below shows a typical pattern:

Note that "V2.1" on the market can vary greatly in quality/compatibility. V1.5 + PIC18F25K80 is a safer choice for the broadest possible support.

Bluetooth / WiFi / USB – which one should I choose?

Apps & Software (iOS/Android/Windows)

iOS

• OBD Fusion – dashboards, logging, reports.
• Car Scanner ELM OBD2 – quick scan, readiness, O2 tests, HUD.
• Engine Link – simple monitoring/logging.

Android

• Torque (Lite/Pro) – classic app for live data, DTCs, widgets.
• Car Scanner – modern UI, I/M, graphs and tests.
• OBD Auto Doctor – reports/logging, multi-platform.

Windows

• OBD Auto Doctor PC, ScanMaster ELM, ScanTool.net – choose BT/WiFi according to adapter.

Would you prefer premium performance (larger buffers, more features)? See the Vgate/vLinker series. For a standalone scanner without a mobile device: handheld models.

Manual & Installation Guide (Bluetooth 4.0)

Preparations

1. Check that the car has a 16-pin OBD2 port and is OBD2/EOBD compliant.
2. Install your OBD app (see above).
3. Ensure good battery voltage (low voltage often results in "No Comm").

Step 1 – Connect the adapter

1. Turn off the ignition.
2. Plug the ELM327 V1.5 into the OBD2 port.
3. Turn the ignition to ON (engine off). Wait 3–5 seconds.

Step 2 – Pair/connect

iOS

1. Open the app and select Bluetooth/BLE adapter in the app's own settings (not in the iOS BT list if the app uses BLE internally).
2. Select the device (e.g., "OBDII", "V-LINK", model-dependent).
3. Protocol: Auto (recommended).

Android

1. Activate Bluetooth → pair in settings or directly in the app (BLE is often managed in the app).
2. Select adapter from the app's list and connect.
3. Protocol: Auto.

Windows

1. Pair in Windows BT settings (or in the program, depending on software).
2. Select COM/BT port in the program → Connect.

Step 3 – Basic Diagnosis

1. Quick Scan: Read MIL and monitors (I/M).
2. DTC: Note codes and descriptions.
3. Freeze-Frame: Review data at the moment of the fault.
4. Live Data: Select key PIDs (ECT, STFT/LTFT, O2, MAP/MAF, RPM, speed).
5. Clear Codes: After repair – clear DTCs to turn off MIL (readiness resets → perform drive-cycle).

Troubleshooting

• App not finding adapter (iOS): Select adapter via the app's BLE search (not iOS system list).
• No OBD communication: Ignition on ON, check OBD fuse, select protocol Auto.
• Losing BT connection: Reduce distance/interference; close other BT apps.
• VIN "N/A": Older cars do not expose VIN via Mode $09.

Frequently Asked Questions (FAQ)

1. Does it support all cars?

It supports OBD2/EOBD vehicles (EU: petrol approx. 2001+, diesel approx. 2004+; USA petrol 1996+). Check for a 16-pin DLC and OBD2 marking.

2. What distinguishes V1.5 from V2.1?

V1.5 with PIC18F25K80 often has wider protocol support (including J1850 PWM/VPW) and more stable timing than many "V2.1" variants on the market.

3. Does it work on iPhone?

Yes, via Bluetooth 4.0 (BLE) in apps that support BLE connection within the app.

4. Can I leave it plugged in?

Yes, but if you want to minimize quiescent current completely – unplug it during long-term parking.

5. Can I read ABS/airbag?

Primarily engine/emission via OBD2. Brand-specific systems often require an app/adapter with extended support and often licenses.

6. Does it display graphs and logs?

Yes, depending on the app. Most apps support graphs/logging and export.

7. Why does it say "No Comm"?

Low battery voltage, ignition off, fuse to OBD port, or wrong mode selected in the app. Check these.

8. Does it support J1939/24 V?

The adapter is intended for passenger cars (12 V) and standard OBD2. J1939/24 V requires specific tools.

9. Can I switch between multiple phones?

Yes – disconnect from the first device and connect from the next via the app.

10. What is STFT/LTFT?

Short-term/long-term fuel trim – helps diagnose lean/rich conditions, leaks, sensor faults, etc.

Tips & Best Practices

• Select fewer PIDs for faster refresh rates during logging.
• Document DTC + freeze-frame before clearing.
• Drive-cycle after Clear: run monitors before inspection.
• Update the app regularly for bug fixes and new features.
• Compare products: See Vgate/vLinker for premium alternatives or handheld for standalone operation.

Package Contents

• 1 × Mini ELM327 V1.5 Bluetooth 4.0 OBD2 adapter (PIC18F25K80)
• 1 × Box

Important Notes & Disclaimer

• Functions depend on what the vehicle exposes via OBD2 and the selected app.
• OBD2 primarily covers engine/emission; other systems often require brand-specific support.
• Do not clear fault codes without first documenting and addressing the root cause.
• All use is at your own risk. Follow applicable laws and safety regulations.

Summary

The ELM327 V1.5 (PIC18F25K80) is a smart choice when you want a small, affordable, and compatible Bluetooth 4.0 OBD2 adapter for iOS/Android/Windows. It handles DTCs, live data, freeze-frame, I/M, and VIN/CALID/CVN – perfect for both hobbyists and daily workshop diagnostics.

Explore more Bluetooth/WiFi adapters or compare with handheld scanners. 🔧