Quick Overview

The KONNWEI KW890 – 3-in-1 OBD2 Scanner + Battery Tester + Oil Service Reset is a powerful yet affordable tool for comprehensive basic engine/emissions diagnostics (OBD-II/EOBD), professional 12V starter battery testing, and quick oil service reset where supported by the vehicle. The KW890 builds on the popular KW850/KW870 with One-Click I/M-Readiness, a 2.8" color screen (320×240), a speaker, and a large fault code database with "troubleshooter" tips that save both troubleshooting time and money.

As a battery analyzer, it measures CCA, SOC, SOH, and internal resistance, and performs cranking and charging tests (charging system). It supports common 12V starter battery chemistries (Flooded/SMF, AGM flat/spiral, GEL) and – according to manufacturer specifications – also some lithium starter batteries (depending on BMS). Results are clearly displayed with graphs and can be saved for printing via PC (free lifetime updates via USB).

The Oil Service Reset resets the service indicator after maintenance on supported vehicles (functionality depends on make/model and year). The OBD part covers all 10 OBD-II modes: read/clear codes (MIL), live data/graphing, freeze-frame, readiness/IM status, VIN/CIN/CVN, etc. The KW890 speaks multiple languages (EN/FR/ES/DE/RU/IT/PL) and works on OBD-II compliant cars from the USA (1996→) and EU/Asia according to their respective OBD implementation dates.

Want to complete your toolkit? See our internal categories for OBD2 Fault Code Readers, Battery Testers, and OBD Cables & Adapters.

Introduction

The KONNWEI KW890 is a professional OBD-II/EOBD scanner that combines three tools in one: engine/emissions diagnostics, battery testing, and oil service reset. The OBD part supports all 10 standard modes (Mode $01–$0A) and allows you to read/clear fault codes (MIL/Check Engine), review live data in real-time with graph display, view freeze-frame, check readiness/IM status, and retrieve VIN/CIN/CVN. The patented One-Click I/M-Readiness button shows with one press if the car is ready for emissions/inspection checks.

As a digital battery analyzer for 12V (and according to spec, also 6V in lead-acid starter battery test modes), the KW890 performs accurate conductivity tests of starter batteries: CCA (Cold Cranking Amps), SOC (State of Charge), SOH (State of Health), and internal resistance. It also performs cranking tests (starting performance) and charging tests (charging system: alternator/regulator), making it easy to locate faults in the starting and charging circuits. Results are clearly presented on the 2.8″ color screen (320×240) and can be stored for printing via PC.

The Oil Service Reset resets the service indicator after an oil change where the vehicle's system allows it. As the availability of this function depends on the make/model/year, it is considered a special function – refer to the manual and the vehicle's workshop data for exact support. The KW890 has a built-in speaker, LED indicators (visual/auditory support), supports updates via USB, and has a multi-language interface (EN/FR/ES/DE/RU/IT/PL).

Specifications

• Product: KONNWEI KW890 – OBD2/EOBD scanner + battery tester + oil service reset
• Display: 2.8″ TFT color (320 × 240 dpi), backlit
• Sound/Indication: Built-in speaker + color-coded LED indicators
• OBD Modes: All 10 modes (Mode $01–$0A), incl. DTC, live data, freeze-frame, IM-readiness, O2 tests, etc.
• DTC Database: Built-in fault code lexicon with troubleshooting tips
• Hotkey: Patented One-Click I/M-Readiness key
• Protocols: ISO 9141, KWP2000 (ISO 14230), SAE J1850 PWM/VPW, CAN (ISO 15765-4)
• Battery Test: SOC, SOH, CCA, internal resistance, cranking and charging test, voltage waveform
• Battery Types: 12V starter batteries (Flooded/SMF, AGM flat/spiral, GEL) and, according to spec, selected lithium starter batteries
• Languages: English, French, Spanish, German, Russian, Italian, Polish
• PC Support: Windows XP/7/8/10 (upgrade/print data via USB), free lifetime updates
• Memory Function: Stores DTC, live data, freeze-frame; playback and offline analysis
• Warranty: 12 months
• Color/Finish: Red rubber casing (grip protection)

Features & Applications

OBD Diagnostics (Engine/Emissions)

• Reads and clears both generic (P0/P2/P3/U0) and manufacturer-specific (P1/P3/U1) fault codes (DTC).
• Turns off MIL/Check Engine after correcting the cause and resets monitors.
• Displays DTC definitions on screen + troubleshooting tips for faster diagnosis.
• Live data with graphing (sensor current, fuel trim, O2 test, MAF/MAP, ECT, RPM, speed, etc.).
• Freeze-frame and I/M-readiness for inspection preparations.
• Reads VIN/CIN/CVN (Mode $09) for vehicle identification and calibration information.
• Support for all current OBD-II/EOBD protocols (incl. CAN-bus).

12V Battery Testing (and 6V according to spec)

• Quick test of CCA, SOC, SOH, and internal resistance.
• Cranking test: assesses starting performance and voltage drop during cranking.
• Charging test: checks alternator/regulator and charging voltage stability.
• Voltage waveform (graph) for in-depth troubleshooting.
• Support for Flooded/SMF, AGM (flat/spiral), GEL, and – according to manufacturer information – some lithium starter batteries.

Oil Service Reset

• Resets service light/interval after an oil change on vehicles that support the function via OBD.
• Adapts service cycle according to the vehicle's logic (mileage/time/climate, etc.).
• Note: Support varies – see the FAQ section and the vehicle's workshop data.

Operation & Environment

• Large, easy-to-read color screen with multi-language menu.
• Fast keyboard with dedicated I/M button.
• Built-in speaker and LED feedback (visual/auditory).
• Data can be saved, played back, printed via PC (USB).

Benefits – why the KW890 is a good choice

• All-in-one: OBD2 scanner, battery tester, and oil service reset in one unit.
• Time-saving: One-Click I/M-Readiness, DTC tips, and graphical live data.
• Professional battery diagnosis: CCA/SOC/SOH/IR + cranking/charging test with waveform.
• Upgradeable: Free lifetime updates, data printing via PC.
• Multi-language: Choose interface in EN/FR/ES/DE/RU/IT/PL.
• Robust: Rubber protection and clear interface for demanding workshop use.

More tools? Explore our internal selections of OBD2 Fault Code Readers and Battery Testers.

Compatibility

OBD Diagnostics: Works on OBD-II/EOBD compliant vehicles (USA: 1996→, EU petrol ≈ 2001→, EU diesel ≈ 2004→; some exceptions apply). Supports ISO 9141, KWP2000 (ISO 14230), SAE J1850 PWM/VPW, and ISO 15765-4 (CAN).

Battery Test: Designed for 12V starter batteries (and according to spec, 6V in relevant modes) of types Flooded/SMF, AGM (flat/spiral), and GEL. According to manufacturer information, some lithium starter batteries can be tested – function and accuracy depend on BMS/technology.

Oil Service Reset: Availability depends on make/model/year and the vehicle's control unit. Refer to the vehicle's workshop information and the list in the tool's menus.

Installation & Manual 🔧

Preparations

• Park safely, apply parking brake.
• Have the vehicle's key/ignition system ready (ignition ON without starting for many OBD functions).
• Ensure the OBD port (usually under the dashboard near the driver) is easily accessible.
• For battery test: Turn off all consumers, doors, and lights. Let the car rest for a few minutes.
• For oil service reset: First perform service/oil change according to manufacturer's specification.

Step-by-step: OBD Diagnostics

1. Connect the KW890's OBD cable to the car's OBD-II socket.
2. Turn on ignition (engine off initially) and start the KW890.
3. Select OBD-II/EOBD in the menu. The tool automatically identifies protocol and ECU.
4. Read Fault Codes (DTC): Go to Read Codes for active/stored/pending codes with definitions.
5. Freeze-frame: View frozen parameters from when the code was set.
6. Live data: Select Data Stream, mark sensors (ECT, MAF, MAP, O2, STFT/LTFT, RPM, VSS, etc.) and open graph.
7. I/M-Readiness: Press One-Click I/M for quick inspection status (monitor circuits ready/not ready).
8. Clear Fault Codes: After correcting the cause, select Clear Codes to extinguish MIL. Then perform a drive cycle so monitors can become "Ready".
9. VIN/CIN/CVN: Read identities under Mode $09 as needed (e.g., for calibration check).
10. Save & Print: Store reports and export via PC software (USB) for printing.

Step-by-step: Battery Test (12V, according to spec also 6V)

1. Turn off engine and all extra consumption. Open battery cover if necessary.
2. Connect test leads: RED to battery +, BLACK to −.
3. Select battery type (Flooded/SMF, AGM, GEL, possibly lithium depending on your model) and CCA/EN/DIN/IEC standard and nominal CCA.
4. Battery Health (SOC/SOH): Run rest test. Read SOC, SOH, internal resistance, and voltage.
5. Cranking test: Start the engine when prompted. The tool measures the lowest voltage during cranking and assesses the starting circuit.
6. Charging test: Let the engine run without and with consumers (lights/fan). The tool assesses alternator/regulator (charging voltage/ripple).
7. Waveform: Display voltage graph to detect ripple, regulator oscillations, or faulty diode bridge.
8. Save report: Store results, print via PC if you wish to attach to customer record.

Step-by-step: Oil Service Reset

1. Perform oil change and service according to OEM. Then turn on ignition (engine off).
2. Select Oil Reset in the main menu.
3. Select vehicle/menu according to on-screen instructions (model/year/ECU).
4. Follow the instructions: the tool resets the service indicator/mileage/time where support is available.
5. Turn off ignition, wait 10 seconds, turn on again and verify that the service light is off.
6. Note: If the vehicle requires manual menu selections in the instrument cluster, the KW890 provides guidance.

PC connection, printing & updating

• Install PC software (Windows XP/7/8/10). Connect KW890 via USB cable.
• Export saved reports (DTC/live data/battery test) and print.
• Check for firmware/database updates and update free of charge.

Troubleshooting

• No OBD connection: Check OBD fuse, ignition position, other aftermarket OBD equipment interfering.
• Cannot clear MIL: Address the root cause; some codes will not clear until the problem is gone and monitors have passed.
• Incorrect battery values: Check battery type/standard/CCA input and battery temperature/rest time.
• Oil reset fails: Vehicle does not support via OBD or requires OEM procedure. Follow vehicle's manual.
• Update stopped: Try another USB port/cable and run software as administrator.

Tips & Advice 💡

• Always save codes and freeze-frame before clearing – valuable for post-analysis.
• Inspection prep: Use One-Click I/M to ensure monitors are "Ready". Perform a proper drive cycle after clearing.
• Battery test: Let the battery rest for a few minutes before the rest test. For AGM/GEL, select the correct type for accurate results.
• Cranking: Low starting voltage may indicate a bad battery, poor ground, sluggish starter motor, or thick oil.
• Charging: Abnormal ripple often indicates a diode fault. Also measure directly at the alternator if suspected.
• Oil reset: Note the next service interval in the tool's report and in the car's service book.
• Documentation: Print reports for the customer or save in your vehicle file.

Frequently Asked Questions (FAQ)

Does the KW890 work on my car?

If the car is OBD-II/EOBD compliant, the answer is usually yes (USA 1996→, EU petrol ≈ 2001→, EU diesel ≈ 2004→).

Can it read ABS/airbag/comfort modules?

The KW890 is primarily for engine/emissions (OBD-II). For brand-specific systems, brand-specific tools are often required.

What is One-Click I/M-Readiness?

A quick button that shows if the emissions monitors are ready (before inspection).

Does it support all OBD protocols?

Yes: ISO 9141, KWP2000, SAE J1850 PWM/VPW, and CAN (ISO 15765-4).

Can I reset the service light (oil reset) on all cars?

No, the function depends on make/model/year. The KW890 guides where support exists; otherwise, follow the OEM procedure in the instrument cluster.

Does it test 6V batteries?

According to manufacturer spec, modes for 6V lead-acid starter batteries exist; the primary focus is 12V starter batteries.

Support for lithium starter batteries?

According to specification – but results and safety depend on BMS/technology. Follow the battery manufacturer's instructions.

What are CCA, SOC, and SOH?

CCA: cold cranking amps, SOC: state of charge, SOH: state of health. Together they provide a good picture of the battery's status.

Can I print reports?

Yes, save data in the unit and print via PC software (USB).

What languages are available in the menu?

English, French, Spanish, German, Russian, Italian, Polish.

Do I get sound/LED indication?

Yes, the unit has a speaker and color-coded LED indicators for visual/auditory feedback.

Can I update the tool?

Yes, free lifetime updates via PC and USB cable.

What do VIN/CIN/CVN mean?

VIN: vehicle identification number, CIN: calibration ID, CVN: calibration verification number (Mode $09).

Why does the fault code come back after clearing?

The root cause remains. Read live data, fix the fault, and check again.

Can I damage the car with the KW890?

Reading is passive. Incorrect clearing can reset monitors – document before clearing and follow the manual.

Does it show fuel trim and O2 sensors?

Yes, as part of live data and O2 test (Mode $05/$06 depending on ECU).

Does it work on electric cars/hybrids?

OBD engine/emissions data may be limited on EV/Hybrid. The battery tester is for the 12V starter battery.

How do I select the correct CCA for testing?

Read the marking on the battery (CCA/EN/DIN/IEC). Enter the number and standard in the KW890 before testing.

Is the software compatible with Windows 11?

Officially XP/7/8/10. Windows 11 may work but is not always guaranteed – try compatibility mode/drivers.

Package Contents 📦

• 1 × KONNWEI KW890 handheld unit (2.8″ TFT)
• 1 × OBD-II data cable
• 1 × USB cable (PC connection/update)
• 1 × Quick manual/user guide

Note! Contents may vary per batch/market. Refer to the label/manual that comes with your unit.

Disclaimer & Important Notes ⚠️

• Specifications/functions may change without prior notice.
• OBD-II primarily covers engine/emissions. Brand-specific systems often require OEM tools.
• Battery testing on lithium requires the battery's BMS to allow it. Always follow the battery manufacturer's instructions.
• Do not clear fault codes before data is documented and the cause is identified.
• Update software officially supports Windows XP/7/8/10.

Summary

The KONNWEI KW890 combines three tools in one robust, user-friendly instrument: an OBD2 scanner for engine/emissions, a battery tester for the starting and charging circuits, and an oil service reset where supported. The patented I/M button, clear color screen, DTC tips, and graphical live data make troubleshooting quick and logical. The battery section provides professional-level features with CCA/SOC/SOH/IR, cranking/charging tests, and waveform analysis. With PC printing and free updates, the KW890 is a smart long-term investment for both workshops and enthusiasts.

Expand your toolkit with matching products in our internal categories: OBD2 Fault Code Readers, Battery Testers, and OBD Cables & Adapters. If you have any questions – contact us and we'll help you choose the right one.