KONNWEI KW681 – OBD2 Car Scanner + Battery Tester (2-in-1) with color screen, I/M hotkey, CCA/SOC/SOH & starting/charging test

Introduction – What the KW681 is and Does

KONNWEI KW681 combines OBD2 diagnostics for engine/emissions with an advanced 12V battery analysis. The OBD part reads/clears fault codes (P0/P1/U0/U1), displays freeze frame, live data in curves/tables, and supports Mode 6, O2 sensor test, and EVAP test. I/M Readiness with LED/buzzer helps you quickly check if the car is ready for emissions testing.

The battery tester is based on leading conductance technology and provides CCA, SOC, SOH, internal resistance, as well as separate cranking tests and charging tests. Real-time waveform for voltage reveals ripple, voltage drop, and instability. All is displayed on a clear TFT color screen.

Specifications (Bullet List)

• Model: KONNWEI KW681
• Category: OBD2/EOBD/CAN Engine Scanner + 12V Battery Tester
• Display: TFT HD Color Screen, Built-in Speaker & Status LED
• OBD Functions: Read/Clear Codes, Live Data (Graph+Text), Freeze Frame, I/M Readiness (Shortcut Key), Mode 6, O2 Test, EVAP, DTC Dictionary, VIN/CIN/CVN, Print Support via PC
• Battery Functions: Voltage (8–16V), Internal Resistance (mΩ), CCA, SOC/SOH, Cranking & Charging Test, Real-time Waveform, Data Log
• Battery Types: Lead-Acid (Wet), AGM (Flat/Spiral), GEL, EFB
• Standards: CCA, BCI, CA, MCA, JIS, DIN, IEC, EN, SAE, GB (typically 100–2000 CCA)
• System Voltage: 12V (OBD2 Vehicles 1996→)
• Tool Languages: English, French, German, Dutch, Spanish, Russian, Portuguese, Italian, Polish
• PC Support: Windows XP/7/8/10, Online Updates
• Power Supply: Via OBD Port or Battery Clamps (no internal battery operation required)
• Warranty: 12 Months
• Color: Red with Protective Rubber Coating
• Certifications: CE, FCC, RoHS, MSDS, REACH

Features & Applications

• OBD2 Engine/Emissions: MIL cause, fault code clearing, I/M check, and smooth pre-inspection.
• Live Data: View sensors in real-time – easily identify faulty sensors or vacuum leaks.
• Battery Analysis: SOC/SOH/CCA and internal resistance provide facts about the battery's true condition.
• Cranking/Charging: Voltage drop during start and charging stability under load – catch starter/alternator faults.
• Waveform: Visualize ripple and transients – valuable for intermittent faults.
• Reports: Save, playback, and print – perfect for customer dialogue & history.

Suitable for: Home mechanics, enthusiasts, car dealers, workshops, inspection preparation, and seasonal checks (motorcycles/boats/ATVs).

Advantages – Why Choose the KW681?

• 2-in-1: Full OBD2 engine diagnostics and complete battery test in the same robust unit.
• I/M Shortcut Button: One press to verify readiness before inspection.
• Pro Features: Mode 6, EVAP, O2 test, graphed live data, and waveform.
• Objective Standards: Assessment against CCA/EN/DIN/JIS etc.
• No Charging Required: Powered via OBD/battery – always ready.
• Online Updates: Lifetime free updates via PC.

Compatibility & Protocols

OBD2/EOBD: All gasoline/diesel cars with OBD2 (USA 1996→, EU typically 2001/2004→) and CAN/KWP/ISO/SAE. Supported protocols include ISO 9141, KWP2000, SAE J1850 (PWM/VPW), ISO 15765-4 CAN. Note: JOBD2 (some Japanese) and 24V trucks are not supported.

Battery (12V): Lead-acid (wet), AGM (flat/spiral), GEL, EFB. Standards: CCA/BCI/CA/MCA/JIS/DIN/IEC/EN/SAE/GB.

Manual / Installation & User Guide

1) Safe Start-up

• Park safely, put in neutral/park, apply parking brake.
• Turn off engine and all accessories (radio, AC, lights) unless the test requires otherwise.

2) OBD2 Diagnostics – Quick Guide

1. Locate the OBD2 port (often under the dashboard on the driver's side).
2. Plug in the KW681. The unit starts and is powered via OBD.
3. Select language & OBDII in the menu.
4. Select Read Codes to view Diagnostic Trouble Codes (DTCs). Use the built-in DTC dictionary for descriptions.
5. Select Live Data to view sensor readings – switch between text & graph.
6. Check I/M Readiness (shortcut button). Address incomplete monitors before inspection.
7. After repair: Erase Codes (ignition on, engine off). Then drive the vehicle's drive cycle for monitors to become ready.
8. Save/print report via PC if needed.

3) Battery Test – Quick Guide

1. Turn off engine and accessories. Open hood.
2. Connect red clamp to + and black to − on the battery (good contact required).
3. Select Battery Test in the menu. Enter battery standard (e.g., EN/DIN/CCA) & rated current (e.g., 640 CCA).
4. Start the test – read SOH/SOC, CCA, Rint and verdict Good/Recharge/Replace.
5. Select Cranking Test: follow instructions, start the engine when prompted. Read min-voltage/duration.
6. Select Charging Test: with the engine running, measure idle charge and under load (lights, fan, rear window) and observe ripple.
7. Review Waveform (real-time) to detect spikes/ripple.
8. Save measurements. Use PC for printing if desired.

4) PC & Updates

1. Connect KW681 via the included USB cable to a Windows computer.
2. Install the manufacturer's update tool (simple one-click update).
3. Print stored reports if needed.

Interpretation of Battery Test & Troubleshooting

Reference Values

• Resting Voltage: 12.6–12.8V ≈ full, 12.2–12.4V ≈ 50–70%, <12.0V = charge.
• Cranking: Brief drop to 9–10V is normal; <8.5–9.0V suggests weak battery/cable fault/starter motor.
• Charging: 13.8–14.8V (temperature-dependent). <13.2V = poor charging, >14.8V = risk of overcharge.

SOH/SOC/CCA

• SOH ≥ 80%: Healthy battery.
• SOH 60–79%: Beginning degradation – follow up/maintain charge.
• SOH < 60%: Recommended replacement, especially in cold climates/start-stop systems.
• Measured CCA ≪ Rated CCA: Lost cranking capacity.

Quick Troubleshooting Matrix

Tips & Best Practices

• Correct Standard: Match the battery's label (EN/DIN/CCA/JIS) for accurate assessment.
• Temperature: Cold lowers capacity – interpret results considering the environment.
• After Charging: Rest for 30–60 minutes before a new resting measurement.
• Inspection: Use the I/M button and drive the vehicle's drive cycle to complete monitors.
• Complement: More scanners & special tools in the fault code reader collection.

Frequently Asked Questions (FAQ)

Does the KW681 work on my car?

Yes, if it is OBD2-compliant (USA 1996→, EU typically 2001 gasoline/2004 diesel→). 24V trucks are not supported.

Can I clear fault codes after repair?

Yes. Use Erase Codes with ignition on (engine off). Then drive the drive cycle to make monitors Ready.

Does the KW681 support AGM/GEL/EFB?

Yes, select the correct battery type/standard and enter the rated current according to the battery's label.

Does the KW681 display CCA and SOH?

Yes. The unit calculates deliverable cranking current (CCA) and state of health (SOH) via conductance measurement.

Can I print reports?

Yes, via PC (Windows). Results can be stored and printed for customers or archives.

Do I need to charge the unit?

No. It is powered by the car's OBD port or by the battery via the clamps.

Does the tool have Swedish menus?

The tool supports multiple languages as specified. Reports and documentation can easily be used in a Swedish workshop environment.

Package Contents

• 1 × KONNWEI KW681 OBD2 Scanner & 12V Battery Tester
• 1 × Mini-USB Cable
• 1 × User Manual
• 1 × Polyester Storage Pouch
• 1 × Color Box

Important Notes & Disclaimer

• Safety: Use safety glasses, avoid sparks near batteries, follow vehicle manufacturer's instructions.
• Diagnostic Scope: KW681 covers engine/emissions via OBD2 as well as 12V battery/cranking/charging. Full system diagnostics (ABS/SRS/EPB etc.) require brand-specific/professional support.
• Standard Selection: Incorrectly selected battery standard/rated current leads to inaccurate conclusions.
• Temperature & Driving Profile: Affects SOC/SOH and readiness. Interpret results in the correct context.
• No External Links: For related products – see our own fault code readers.

Summary

KONNWEI KW681 is a cost-effective all-in-one tool that combines engine/emissions diagnostics with professional battery analysis. With One-Click I/M, graphed live data, waveform, and printable reports, you get confident decisions for inspection, service, and troubleshooting. Do you need more diagnostic tools? Explore our collection of fault code readers.