How to Use the AUTOOL SDT208 Smoke Leak Detector

The AUTOOL SDT208 is an automotive smoke leak detector. This guide turns the current model-specific controls and official operating sequence into a practical start-to-finish workflow.

Before you start

Work in a clean, well-lit and ventilated area. Stabilize the vehicle, keep rotating or hot components out of the work zone, and open the exact vehicle procedure for the system and test point you will use. A tool connection is not automatically safe just because an adapter fits.

• confirm that the model label reads AUTOOL SDT208 and that the controls match this guide;
• inspect the housing, cables, clamps, hoses, fittings, seals and adapters for damage or contamination;
• confirm the required supplied accessories are present: Main Unit AUTOOL SDT208 smoke leak detector, Power Cable 12V / 24V battery power cable, Smoke Hose Smoke output hose for leak testing, Adapters Cone adapter, rubber caps, adapter set, and accessories, Oil Bottle Empty oil bottle included; testing oil is not included;
• identify the permitted connection point, test range, vehicle state and acceptance criteria before connecting;
• keep eye protection and the task-appropriate gloves within reach; and
• plan how you will return the vehicle circuit or line to its original sealed condition after the test.

Use the AUTOOL manual download center to locate the current instructions when a manual is available. The delivered model label and current vehicle service information control if an older image or remembered setting differs.

SDT208 controls and specifications

The current product record highlights Standard and EVAP Pressure Modes, Tiny-Leak Checks, Airflow Meter, Flow Control Valve, Pressure Gauge. Confirm each relevant control on the physical unit before use; related AUTOOL models can look similar while using different ranges, air sources or operating modes.

Specification or function	Current model
Input Power	DC 12V/24V
Testing Oil Fill Volume	10–15 mL
Rated Output Pressure	<10 psi/35 psi
Rated Output Flow	＜15 L/min
High-Temperature Protection	Stops working above 75°C
How It Works	Low Oxygen Combustion
Rated Power	80W
Response Time	Produces smoke in 5 seconds
Flow Meter Window	Included
Pressure Gauge	Included

Stay inside both limits: the tool’s rated range and the vehicle or component’s permitted test range. When they differ, the lower applicable limit is the boundary. Do not infer a missing gauge, adjustment, mode or protection feature from a higher model in the same series.

How to use the SDT208

Step 1: Add Testing Oil

Fill 10–15 mL baby oil or liquid paraffin into the detector before use. Do not overfill.

Before moving on, pause and check the connection against the physical labels. A secure-looking connection can still be the wrong port, polarity, range or adapter.

Step 2: Open the Airflow Regulator

Gently turn the knob to open the airflow regulator valve before starting the test.

Step 3: Connect the Test Line

Access the system to be tested and position the detector near the test area. Disconnect the line you want to test, then connect the hose or adapter that matches the test port.

Step 4: Connect 12V / 24V Power

Connect the detector to a 12V or 24V DC battery, then turn on the power switch.

Step 5: Select the Mode

Choose Standard Mode or EVAP Mode for the required pressure range. Then use Air Mode for pressure and airflow checks or Smoke Mode for visual leak location.

Step 6: Locate Leaks

Monitor smoke, pressure, and airflow during the test. Use a headlamp if needed to see small points where smoke escapes.

Do not end the job at the first plausible indication. Repeat or confirm the observation under the same controlled condition, then restore the vehicle connection and check for leakage, warnings or an abnormal response.

Read and verify the result

Compare the observation with known conditions, not with a single memorized number. Check whether the reading, indication or visible result is stable, repeatable and produced with the correct setup. If possible, compare a known-good point or repeat after correcting one controlled variable.

• A repeatable result at the correct connection is stronger evidence than a momentary spike or one brief indication.
• An out-of-range result can identify a direction for diagnosis, but it does not name the failed component by itself.
• A normal result at one test point does not clear every part of the system; follow the vehicle diagnostic tree.
• After a repair, repeat the same controlled test and complete the vehicle-specific functional check.

Common mistakes and care

• Testing oil is not included.
• Use liquid paraffin or baby oil as testing oil.
• Refill only when smoke becomes thin.
• Drain remaining testing oil before adding fresh oil.
• Do not operate continuously for more than 8 minutes.
• If the pressure gauge continues to rise, no obvious leak may be present. If pressure keeps dropping, inspect the test line for a possible leak.
• Do not select 35 psi Standard Mode unless the vehicle or component service procedure allows that pressure range.
• Do not borrow a range, mode, connection order or interpretation rule from another model in the series.
• Do not disconnect a live electrical, pressure, vacuum or fluid connection; first return the tool and vehicle system to a safe state.
• After use, clean only as directed, keep ports capped, coil leads and hoses without sharp bends, and store the kit dry.

Frequently asked questions

What Testing Oil Should I Use for SDT208?

Testing oil is not included. If dedicated smoke-testing oil is unavailable, use liquid paraffin or baby oil.

How Much Testing Oil Should I Add?

Add 10–15 mL testing oil before use. Do not add more than 15 mL each time. Refill only when the smoke becomes thin, and drain the remaining testing oil before adding fresh oil. If too much oil is added accidentally, drain some oil out before operation.

What Power Supply Does SDT208 Need?

SDT208 requires a 12V or 24V DC battery. Connect the detector to the battery correctly before turning on the unit.

Final SDT208 checklist

• Exact model, permitted test point and test range confirmed
• Tool, leads, hoses, seals and adapters inspected
• Setup completed in the model-specific sequence
• Observation repeated or otherwise verified
• Vehicle connection restored with no leaks, loose terminals or open ports
• Tool shut down, cleaned and stored without trapped pressure or unsafe power

Used this way, the SDT208 supports a disciplined diagnostic decision: prepare the correct test, control the setup, verify the observation and leave the vehicle in a known safe state.