KONNWEI KDIAG Bluetooth OBD2 Full System Scanner – Oil Service, Battery Match, Live Data, I/M

Introduction – what KDIAG is and does

KONNWEI KDIAG is an advanced Bluetooth OBD2 scanner for full system diagnosis in modern cars. It not only scans the engine ECU but also accesses, for example, ABS, SRS/airbag, transmission (TCM), body control module (BCM), battery management (BMS), steering angle (SAS), TPMS, climate control and other control units – depending on the vehicle. In the app (iOS/Android), you get Auto-VIN, live data with graphs, DTC database and activation commands, as well as service resets such as oil service and battery matching. After diagnosis, a clear health report is generated that can be saved or shared (e.g., with a customer or colleague).

KDIAG supports standard protocols (ISO 14230-4 KWP2000, ISO 15765-4 CAN, ISO9141-2, ISO14229 UDS, SAE J1850 VPW/PWM) and works on OBD2/EOBD cars from 1996 onwards (see section Compatibility & Protocols). The compact adapter has a dust/shock-resistant design and is updated free of charge via the app.

Specifications (bullet points)

• Model: KONNWEI KDIAG
• Type: Full System OBD2 Scanner (Bluetooth 4.0/5.0) for iOS & Android
• Main Functions: System scanning, fault code reading/clearing, live data + graphs, freeze frame, I/M readiness, Auto-VIN, DTC lookup, actuation/component test, multi-reset (incl. oil service & Battery Match), vehicle report
• System Support (examples): ECM/PCM, TCM, ABS, SRS, BCM, BMS, TPMS, SAS, A/C etc. (vehicle dependent)
• Protocols: ISO 14230-4 (KWP2000), ISO 15765-4 (CAN), ISO9141-2, ISO14229 (UDS), SAE J1850 VPW/PWM
• Connection: 16-pin OBD2; wireless BT to phone/tablet
• App Languages: Chinese, English, German, French, Italian, Russian, Spanish, Polish, etc.
• Compatibility: 40+ brands, 120+ models globally, typically OBD2/EOBD 1996+
• Updates: Lifetime free via app
• Dimensions/Weight (approx.): 7.1 × 4.8 × 2.4 cm / ∼95 g
• Certifications: CE, FCC, RoHS (according to manufacturer)
• Customer Support: App-based feedback/help-center

Features & Use Cases

• Troubleshooting in all systems: Read & clear DTCs in engine, transmission, ABS, SRS, BMS, BCM, TPMS, SAS, A/C etc.
• Live data stream: Display sensors in real-time (values & graphs), compare banks, record & replay.
• I/M Readiness & Freeze Frame: Check test readiness before inspection and capture a “snapshot” when a fault occurs.
• Auto-VIN: Automatic identification of make/model/variant where supported.
• Actuation/Component Test: Trigger outputs/actuators (vehicle-dependent) for targeted troubleshooting.
• Service Resets: Oil service/interval, Battery Match (battery replacement/registration), and more reset functions (vehicle-dependent).
• Reports: Generate a complete vehicle report – share as a link/file.
• App Support: DTC database, online feedback, guides, and free updates.

Typical tasks: turning off the check engine light after a repair, reading ABS faults for wheel sensor issues, registering a new battery in the BMS, checking live data from lambda & MAP sensors, confirming I/M status before re-inspection, or analyzing transmission temperature/pressure during a test drive.

Advantages – why choose KDIAG?

• Full system in your pocket: Professional reach without tangled cables.
• Fast workflow: Auto-VIN + smart report saves time with each car.
• Live graphs & recording: Detect intermittent faults and verify repairs.
• Service & maintenance: Reset functions (oil, battery, etc.) directly in the app.
• Wide brand coverage: Support for 40+ car brands, 120+ models (1996+).
• Lifetime updates: New car profiles & features at no extra cost.
• Multilingual experience: App in several European languages.

Compatibility & Protocols

Vehicle requirements: OBD2/EOBD-compliant vehicle (usually petrol 2001+/diesel 2004+ in EU; 1996+ in USA; local variations occur). KDIAG also works on many hybrid models for the systems exposed via OBD2. 24V heavy-duty vehicles are not supported.

Protocols: ISO 14230-4 (KWP2000), ISO 15765-4 (CAN), ISO9141-2, ISO14229 (UDS), SAE J1850 (VPW/PWM). Note! Full system access and special functions are always vehicle and model year dependent.

Manual / Installation & User Guide (HTML)

1) Preparation

1. Download the free KDIAG+ app from the App Store/Google Play.
2. Check that the car has a 16-pin OBD2 port and that the ignition works.
3. Enable Bluetooth on your phone/tablet.

2) Connect the adapter

1. Insert KDIAG into the car's OBD2 port (usually under the dashboard near the driver's seat).
2. Turn on the ignition (ACC/ON) without starting the engine.
3. Open the app, select “Connect” & pair with the device (KDIAG). Follow any PIN dialog in the app/OS.

3) Auto-VIN & vehicle selection

1. Tap Auto-VIN for automatic identification. If VIN is not read – select make/model manually.
2. Confirm the correct model year/drivetrain for best system coverage.

4) Full system scanning

1. Select Full System Scan or the corresponding menu.
2. The app scans through available control units (ECU, TCM, ABS, SRS, BCM, TPMS, SAS, A/C etc.).
3. Once scanning is complete – open the list for DTCs, status and any freeze frames.

5) Live data & graphs

1. Go to Live Data, select system and parameters (PID).
2. Display as a table or graphs; start record for logging during a test drive.
3. Compare curves (e.g., lambda sensor bank 1/2, wheel speeds, rail pressure, boost pressure, ECT/IAT etc.).

6) Service functions (reset)

1. Oil/Service Reset: follow the app's steps to reset the service indicator after an oil change.
2. Battery Match/Registration: for battery replacement – register a new battery in the BMS (requires car support).
3. Further reset/maintenance may be available per brand (e.g., EPB, SAS calibration etc.).

7) Actuation/Component Test

1. Open Actuation/Component Tests (if available for your car).
2. Start/stop a selected actuator (e.g., fan, pump, valve) according to safety instructions.

8) Report & sharing

1. Create a Vehicle Health Report after scanning.
2. Share the report (PDF/link) with a customer, colleague or save it in the service history.

9) Clearing fault codes

1. Address the root cause first. Then select Clear DTC in the respective system.
2. Perform a test drive and a new scan to confirm that the fault does not recur.

Examples & Use Cases

A) Check Engine Light & Inspection

Read DTC + freeze frame, review fuel trims and O2 sensors in Live Data, fix and check I/M Readiness before inspection.

B) Starting/Charging Issues

Read BMS/BCM codes, check battery registration (Battery Match), log voltage/current during start, monitor alternator load and voltage while driving.

C) ABS/ESP Warnings

Compare wheel speed sensors in graphs, locate faulty sensors, clear codes and test drive.

D) Comfort & Climate Control

Troubleshoot fan stages, flap motors, pressure sensors, and temperature probes. Activate components to confirm function.

Tips & Best Practices

• Stable power: Ensure the car has good battery voltage during diagnosis. Use a trickle charger for long sessions.
• Correct profile: If Auto-VIN fails – select the car model manually for full ECU access.
• Always log before clearing: Save a report before clearing DTCs – valuable for intermittent faults.
• Service functions: Follow the car's workshop procedure. Some resets require specific conditions.
• Supplement your toolbox: For stationary diagnosis, a handheld reader can be convenient – see our fault code readers.

Frequently Asked Questions (FAQ)

Does KDIAG work on my car?

If the car is OBD2/EOBD compatible (typically EU petrol 2001+/diesel 2004+, USA 1996+), there is support for the engine and often other systems. Full system and special functions vary by make/model year/control unit.

Do I need cables?

No, the adapter communicates wirelessly via Bluetooth to the app on your phone/tablet. The vehicle connects via 16-pin OBD2.

Can I reset service and register a new battery?

Yes, Oil/Service Reset and Battery Match are supported where the vehicle exposes the functions via OBD.

Are UDS/newer CAN buses supported?

Yes, KDIAG handles, among others, ISO14229 (UDS) and ISO15765-4 (CAN).

Can I get a health report?

Yes, the app generates a Vehicle Health Report that can be saved and shared.

Do I get updates?

Yes, the app and vehicle database are updated free of charge.

What is included in the DTC database?

Generic and many manufacturer-specific codes with definitions. Deeper workshop data may vary by make/model.

Does it work on 24V trucks?

No, KDIAG is designed for 12V passenger cars/light vehicles.

Package Contents

• 1 × KONNWEI KDIAG Bluetooth OBD2 Adapter
• 1 × Quick Guide/User Manual (digital/physical depending on batch)
• 1 × Packaging

Packaging specifications (approx.): Product 7.1×4.8×2.4 cm / 0.095 kg, package 12×7.5×4 cm / 0.12 kg.

Important Notices & Responsibility

• Vehicle Support: System access & special functions depend on the car's ECU configuration and model year.
• Safety: Use in a safe place, follow vehicle manufacturer procedures. Some tests activate components.
• Warranty & Updates: Updates via the app. Warranty terms according to reseller/manufacturer.
• Complementary needs: For advanced workshop diagnostics, OEM software may be required.
• No external links: For accessories and more scanners, see fault code readers from us.

Summary

KONNWEI KDIAG is a compact but powerful full system scanner that brings professional-level troubleshooting directly to your phone. With wide brand coverage, Auto-VIN, live data in graphs, service resets, and a shareable health report, troubleshooting becomes faster and clearer. Need more OBD options? Check out our collection of fault code readers and build your perfect diagnostic setup.