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SML400 Automotive Smoke Leak Detector

The AUTOOL SML400 is a high-end model in the automotive smoke leak detector series, featuring dual testing modes: Smoke Mode and Air Mode. Equipped with low-oxygen smoke generation technology and a built-in air pump, it requires no external air source—simply connect it to a 12V vehicle power supply. The visible smoke quickly pinpoints small leaks in pipelines, eliminating unnecessary disassembly and blind repairs. Unlike detectors with only a single testing mode, the upgraded Air Mode offers greater testing flexibility and broader coverage. It is suitable for intake vacuum pipelines, EVAP systems, exhaust pipelines, crankcase ventilation systems, cooling pipelines, and vehicle vacuum systems. Compatible with gasoline vehicles, new energy vehicles, motorcycles, light trucks, and more, it flexibly adapts to various testing conditions, enhancing the accuracy and reliability of leak detection.

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Product Features

3 Modes in 1 – One Tool, Multiple Applications:

①Smoke Mode: Generates dense, non-toxic smoke to visually pinpoint leaks;

② Air Mode: Outputs compressed air without smoke. Check the pressure gauge to determine if there is a leak;

③ Pressure Holding Leak Test Mode: Automatically runs a 3-minute pressure holding countdown. The screen directly displays “Leak / No Leak,”providing quantitative results, reducing reliance on experience, and ensuring more rigorous testing.

Built-In High-Power Air Pump – Ready for Mobile Repairs:

Features an integrated air pump—no external air compressor or workshop air source required. Simply connect it directly to a 12V vehicle battery. Ideal for mobile repairs, roadside assistance, and on-site testing.

Smart Digital Display – Visualized Testing Data:

HD Digital Screen: Displays the pressure holding countdown and automatically determines leak results.

Pressure Gauge + Flow Control Valve: Enables real-time control of output air pressure and smoke flow. Adjustable pressure prevents high-pressure damage to sensitive vehicle pipelines.

Precision Flow Meter: Allows smoke output to be freely adjusted as needed.

Stable & Fast Smoke Generation – Pinpoints Small Leaks:

Utilizes low-oxygen smoke generation technology, producing smoke within 10 seconds and reaching full smoke output within 30 seconds. The dense, evenly distributed smoke makes even 0.1mm micro-cracks visually obvious—eliminating unnecessary parts replacement and blind troubleshooting while significantly reducing repair time. Low smoke oil consumption also keeps long-term operating costs down.

Multiple Safety Protections – Durable & Overheat-Resistant:

Equipped with intelligent temperature control and automatic overheat shutdown to prevent dry burning during extended operation. Automatic pressure stabilization protects vehicle pipelines from high-pressure impact. The robust sheet-metal housing offers excellent impact resistance, built for intensive, continuous use in busy repair shops.

Full Vehicle Pipeline Coverage + Complete Accessories:

Compatible with gasoline vehicles, new energy vehicles, motorcycles, ATVs, and more. Comes standard with multiple sizes of sealing plugs, inflatable bladder plugs, and extension hoses—making it easy to seal various pipelines and openings without the need to purchase additional accessories.

3-Year Warranty:

For equipment damage caused by non-human factors, AUTOOL provides free replacement parts within three years. If you have any questions, please feel free to contact us—we will respond within 24 hours. We are committed to being responsible for our products, our customers, and our partners.

SML400
Working Principle Low-Oxygen Combustion
Power Supply DC 12V Power Supply
Air Pressure Output Built-in Air Pump
Rated Output Pressure 0–1500 mbar
Rated Output Flow Rate 0.6–6 L/min

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