KONNWEI KW870 is a powerful and affordable OBD2/EOBD/CAN code reader that covers all 10 OBD modes for complete engine and emission diagnostics on OBD II compliant vehicles (USA 1996+, EU petrol ≈2001+, EU diesel ≈2004+). With the patented One-Click I/M button, you can immediately see if the car is ready for inspection. The 2.8” backlit TFT screen and built-in speaker make operation clear and fast. You can read/clear DTCs, view live data numerically and in graphs, review freeze frame, perform O2 tests, Mode $06 (on-board monitoring), retrieve VIN/CALID/CVN, and print reports via PC.
In addition to engine diagnostics, the KW870 also functions as a battery tester for 6V/12V lead-acid batteries (motorcycles, cars, light trucks, lawnmowers, etc.) – with health test, cranking test, and charging test. Troubleshooting tips ("?") and a built-in DTC dictionary help you take the right action faster. The device supports free updates and PC printing (Windows XP–10). Do you need more handheld scanners or wireless adapters? Check out our collection of code readers. 🔧
Introduction – What is the KW870?
The KONNWEI KW870 is a handheld OBD2/EOBD/CAN scanner that combines advanced engine/emission diagnostic functions with an integrated battery tester for 6V and 12V lead-acid batteries. Its purpose is to provide car owners, enthusiast mechanics, and small workshops with a robust tool that:
Quickly explains MIL (Check Engine) by reading current/stored/pending DTCs with clear definitions.
Visualizes live data (up to 50 PIDs/s) both numerically and in graphs for easy trend analysis.
Simplifies inspection checks via One-Click I/M – monitor status in a second.
Documents your work: save sessions and print reports via PC.
Assesses battery status (indicative SOH/SOC), cranking, and charging without a separate instrument.
This makes the KW870 an all-in-one tool that covers the most common diagnostic and battery needs in everyday use. It is built into a shock-resistant ABS casing with a 2.8” TFT color screen, clear buttons, and a built-in speaker that provides acoustic feedback during menu selections, tests, and alarms.
Vehicle Compatibility:All OBD II compliant vehicles (see limitations in notes)
Cable: 1.5m OBD2 16-pin DLC cable; separate battery cable for testing
Function Tips: Built-in DTC dictionary + troubleshooting tips via "?" button
Features & Applications
All 10 OBD Modes: Full engine/emission diagnostics – from read/clear DTC to advanced monitors (Mode $06).
DTC & MIL: Read generic (P0/P2/P3/U0) and manufacturer-specific (P1/P3/U1) codes; turn off MIL after repair.
DTC Definitions: Explanations directly on screen – faster troubleshooting.
One-Click I/M: See monitor status (Ready/Not Ready) before inspection with one button press.
Live Data: View/plot up to 50 PIDs/s (RPM, ECT, IAT, MAP/MAF, trims, lambda etc.).
Freeze Frame: Captures conditions when the fault occurred – invaluable for intermittent faults.
Mode $06 & O2 Test: Analyze ECU's own monitoring tests and oxygen sensor performance.
VIN/CALID/CVN: Identify vehicle/calibrations for documentation (Mode $09).
Battery Test 6/12V: Health (indicative), cranking, and charging in the same instrument.
Log & Print: Save diagnostic sessions, export/print via PC and create professional reports.
Troubleshooting Tips: The "?" button provides advice on probable causes and next steps.
Supported Protocols & Vehicle Requirements
Protocols: ISO 15765-4 CAN, ISO 9141-2, ISO 14230-4 KWP2000, SAE J1850 VPW/PWM.
Regional Guidelines: USA 1996+, EU petrol ≈2001+, EU diesel ≈2004+ (exceptions occur).
Requirements: 16-pin OBD-DLC and 12V electrical system for engine diagnostics.
Note: The KW870 focuses on engine/emission. Access to other systems (ABS/SRS/BCM/TPMS/BMS etc.) often requires brand-specific diagnostics. Not intended for 24V/J1939 (heavy vehicles).
Battery Test 6V/12V – Health, Cranking & Charging
The KW870 has an integrated battery tester for 6V and 12V lead-acid batteries (common starter/service batteries in motorcycles, cars, light trucks, lawnmowers, etc.). The test results help you determine if the battery should be used, charged, or replaced, and if the starter motor and alternator are behaving correctly.
Health Test: Indicative SOH/SOC, voltage, internal resistance (Ri), and CCA comparison (according to selected standard).
Cranking Test: Measures voltage dip & cranking time – reveals weak cell, poor contact, or heavy starter motor.
Quick Verification: Combine battery test and OBD live data for a complete picture of starting & charging.
Tip: For lead-acid, the resting voltage should be measured after 2–3 hours at rest. Then compare with the cranking dip and the alternator's charging voltage.
Manual & Installation Guide (Step-by-Step)
A. Preparation & Safety
Park safely, engage park/handbrake and turn off the engine.
Have the vehicle's OBD2 port accessible (usually under the dashboard on the driver's side).
For battery testing: use safety glasses/gloves and ensure terminals are clean.
B. Basic Diagnostics (OBD2)
Turn ignition OFF. Connect the 16-pin OBD cable to the vehicle's DLC and to the KW870.
Turn ignition ON (engine OFF). The KW870 will start and automatically detect the protocol.
Select language and open the OBD menu.
Press Read Codes – note current/stored/pending DTCs and DTC definitions.
Open Freeze Frame – document RPM, ECT, load, trims, MAP/MAF etc.
Press One-Click I/M – see monitor status (Ready/Not Ready) before inspection.
Go to Live Data – select 6–10 key PIDs (ECT, STFT/LTFT, O2 values, MAF/MAP, RPM, spark advance).
Start the engine if needed and observe graphs (easier to see trends/deviations).
Rectify cause → Erase Codes to turn off MIL and reset monitors.
Perform drive cycle according to vehicle specifications to get monitors to Ready.
C. Battery Test (6/12V)
Turn off the engine and all loads. Connect red clamp to +, black to − on the battery.
Select Battery Test. Enter battery type (WET/AGM/GEL/EFB) and standard (e.g., CCA/EN) + rated CCA.
Run the test and note results: Good / Recharge / Replace, SOH/SOC (indicative), Ri, CCA.
Cranking: Start the engine when the unit prompts – note voltage dip & cranking time.
Charging: Let the engine run at idle/RPM and turn on loads – check charging voltage/ripple.
D. Report & Print
Save the diagnostic session (DTC/freeze/live data) and battery test.
Connect to PC (Windows) → export/print as customer documentation or internal records.
Practical Workflows & Examples
1) Misfire (P030x)
Read codes: Identify cylinder. See Freeze Frame (temperature, load, RPM).
Live Data: Follow STFT/LTFT, O2-switching, MAF/MAP and ignition timing.
Action: Move ignition coil and/or spark plug between cylinders – does the fault seem to follow the component?
Verify: Clear codes, test drive and check I/M.
2) EVAP-related (P044x)
Check: Do not overfill the tank. Inspect fuel cap gasket and hoses.
Mode $06: Read monitoring results (vehicle-dependent) for small/large leaks.
Verify: After repair – clear, perform correct drive cycle (EVAP often requires specific conditions).
3) O2/Lambda (P013x/P015x)
Live Data: B1S1/B2S1 should switch quickly; B1S2/B2S2 more stable.
Verify: Clear codes and follow graphs after repair.
4) Charging Problem (no codes but starting difficulties)
Battery Test: Resting voltage + SOH/SOC/Ri – weak battery or parasitic drain?
Cranking: If the dip is > 9.6–10.0V (12V system), the battery may be worn or the starter motor heavy.
Charging: Charging voltage 13.8–14.7V typically (12V). High ripple → suspect rectifier/regulator.
Tips, Best Practices & Data Interpretation
Save first, clear later: Document DTC & freeze frame before clearing – especially important for intermittent faults.
Limit PIDs: Select 6–10 key values in live data for faster updates and clearer graphs.
Stable voltage: Low battery voltage can cause communication errors – trickle charge if needed.
Compare relationships: MAF vs MAP, O2 vs trims – the whole picture reveals the source of the error.
After repair: Perform drive cycle so monitors become Ready for inspection.
Supplement if needed: If you need more service functions – see our code readers.
Battery Test: Perform resting voltage after rest, then cranking and charging – compare with references and previous logs.
Frequently Asked Questions (FAQ)
1. Does the KW870 read ABS/airbag/BCM?
OBD2/EOBD primarily concerns engine & emission. For ABS/SRS/BCM, brand-specific diagnostics are often required.
2. Does it work on diesel and hybrid?
Yes, for OBD2 parameters in engine/emission. Deeper system-specific data may require brand-specific tools.
3. Does the KW870 support EVAP commands?
Parts of EVAP data/monitors can be read on some vehicles. Availability varies with make/model year/market.
4. Can I print reports?
Yes. Save the session and print via PC (Windows). Good for customer documentation and records.
5. What does the battery function include?
Health test (indicative), cranking (start) and charging (alternator). For 6V/12V lead-acid.
6. Does the KW870 work on 24V vehicles?
No, the OBD part is designed for 12V OBD2/EOBD cars. Battery test is 6V/12V.
7. Are updates free?
Yes, free upgrades and PC printing are supported.
8. Why does the MIL reappear after clearing?
Clearing turns off the light but doesn't fix the root cause. Repair the underlying fault – then perform a drive cycle.
9. Compatibility with older vehicles?
See regional guidelines. Some older EU vehicles may lack full OBD2 support despite a 16-pin port.
10. Where can I find more readers/adapters?
See our collection of code readers for alternatives and complements.
Package Contents
1 × KONNWEI KW870 Handheld OBD2 Scanner
1 × 1.5m 16-pin OBD2 Cable
1 × Battery Test Cable (red/black)
1 × 82cm USB Cable (PC connection/printing)
1 × Nylon Carrying Bag
1 × User Manual
Important Notes & Responsibilities
Compatibility: "All OBD II vehicles" follow general guidelines; exceptions occur (e.g., some Russian models before 2012). Not for heavy vehicles/24V/J1939.
System Scope: The KW870 focuses on engine/emission. Other systems typically require brand-specific diagnostics.
Data Security: Use correct interpretation of OBD data; always follow vehicle manufacturer's service instructions.
Battery Test: Results are indicative and should be interpreted in conjunction with load tests, history, and visual inspection.
Safety: Diagnostics/charging should not be performed while driving. Work in a ventilated area, avoid sparks near open lead-acid batteries.
Updates: Feature availability may vary per vehicle/model year/market.
Need more models and accessories? Visit our code readers category.
Summary
The KONNWEI KW870 combines full OBD2 diagnostics (all 10 modes) with 6/12V battery testing in a robust, easy-to-use package. With One-Click I/M, clear graphs in live data, a DTC dictionary, and PC printing, you work faster and smarter – from MIL cause and sensor data to battery health, cranking, and charging. For both DIY users and professionals, the KW870 is an accurate choice when you want to troubleshoot the entire powertrain's "electrical & emission" with one and the same tool. 🔧
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Tack för din feedback! Vi är glada att höra att du upplevde vår produkt som snabb och smidig. Det är precis vad vi strävar efter att erbjuda våra kunder. Tveka inte att kontakta oss om du behöver hjälp med något annat. Tack igen för din recension!
