How to Use the AUTOOL ATF802 Transmission Fluid Exchanger

Use the AUTOOL ATF802 as a supervised fluid-circuit service machine, not as a substitute for transmission diagnosis or vehicle service data. The reliable sequence is to verify the exact ATF and finish procedure, prepare both machine tanks and scales, connect an approved cooler-line point as a sealed series circuit, match the AC supply to the nameplate, select a validated quantity, supervise the equal-volume exchange, restore the vehicle circuit, and set the final level at the specified temperature.

Updated August 27, 2026.

What the ATF802 does—and what remains your responsibility

The ATF802 is a five-inch-screen automatic transmission fluid exchanger with separate pumps for the new- and used-fluid paths. Its main service functions include Circulating Oil Exchange, Circulating Flushing, Old Oil Recovery, New Oil Filling, Pipe Self-Flushing, New Oil Tank Emptying, Old Oil Tank Emptying, and New Oil Tank Filling. Two mechanical gauges show filling and return pressure, while the fluid windows and tank-level windows give physical cross-checks against the screen.

Automatic flow-direction detection helps the machine configure its pumping direction after the vehicle circuit is connected. Equal-volume control uses the machine’s tank measurements to coordinate the two fluid paths. Neither function proves that the transmission is suitable for exchange, that an adapter seals correctly, or that the selected quantity and ATF are correct for the vehicle.

Do not use exchange to disguise severe slipping, delayed engagement, loss of drive, heavy debris, coolant contamination, internal mechanical damage, an unresolved hydraulic fault, or active leakage. Diagnose those conditions first. If the vehicle manufacturer prohibits cooler-circuit exchange, use the approved service method instead.

Before you start

Open the AUTOOL manual download center and match the available document to the model, nameplate, five-inch control panel, two gauges, dual-pump layout, ports, and software shown on your delivered unit. Also obtain current vehicle service information for the transmission code, exact ATF, cooler-line access, approved operating state, capacity, selector procedure, fluid-temperature measurement, final level, fastener torque, adaptation, and road test.

Prepare enough sealed exact-specification ATF for the documented plan and final adjustment. Gather approved adapters and new seals or retainers, clean dedicated transfer equipment, caps, catch pans, spill control, labelled waste containers, a scan tool that can read transmission-fluid temperature, appropriate hand and eye protection, and approved vehicle support if access requires lifting.

Place the ATF802 upright on a level, dry floor. Lock or stabilize it against unintended movement. Keep both oil tanks seated correctly on their scales. Route hoses and the power cord away from exhaust parts, radiators, fans, belts, pulleys, axles, wheels, lift arms, sharp edges, and walking paths.

Identify the ATF802 controls and fluid paths

At the front, identify the filling-pressure gauge, return-pressure gauge, old/new fluid sight glasses, five-inch display, direction buttons, Back button, and Confirm button. The screen is the command interface; the gauges and windows remain independent checks that fluid is moving plausibly.

Around the cabinet, locate the USB upgrade port, power switch, AC inlet, hose-flushing ports, oil filter, oil drain hose, two oil-exchange hoses, new-fluid filling port, cleaning-fluid bottle, old-tank and new-tank level windows, handle, storage areas, and casters. Do not assume that two nearby ports are interchangeable—read the exact cabinet labels before attaching a hose.

The separate pumps reduce mixing between the new- and used-fluid circuits, but fluid identity still depends on disciplined storage and cleanup. A dedicated new-fluid path contaminated by the previous job can introduce the wrong chemistry even when both pumps work correctly.

ATF802 step-by-step operating procedure

Step 1: Confirm that the transmission is a suitable exchange candidate

Record the driver’s concern, previous service, known fluid, leaks, warning messages, shift quality, and additives. Scan the transmission and related modules. Inspect accessible fluid, pan evidence, cooler lines, connectors, and external leakage.

Do not proceed until severe slipping, loss of drive, delayed engagement, heavy debris, burnt-fluid symptoms, coolant contamination, active electrical faults, hydraulic problems, and significant leaks have been diagnosed. Fluid exchange is maintenance; it does not repair a worn clutch, blocked cooler, failed solenoid, damaged seal, or contaminated cooling system.

Step 2: Define the exact ATF and the finish procedure

Use vehicle identification, build data, and the transmission code to choose the exact ATF specification. Do not select fluid by color, odor, a broad “universal” claim, or the product left in the machine. Confirm whether the transmission has a dipstick, standpipe, overflow plug, electronic level routine, or another temperature-dependent procedure.

Write down the planned exchange quantity, target temperature window, engine state, selector state, vehicle attitude, fill hardware, torque, adaptation, and verification drive. Treat any quantity suggested by the ATF802 database as a starting value that must match current vehicle information. A database entry cannot identify a modified transmission, service bulletin, regional fill, or prior repair by itself.

Step 3: Match the machine, software, and AC supply

Read the ATF802 nameplate and record its serial or hardware information. Confirm that the control panel, two gauges, hose labels, tank layout, software mode, plug, and power inlet match the delivered instructions. The product family includes regional AC configurations, so use only the voltage and frequency marked on the physical unit.

With the machine switch off, inspect the power cable end to end. Verify a grounded outlet with suitable voltage, fuse or breaker protection, and workshop protection for the environment. Do not use an improvised plug adapter, damaged extension, wet outlet, or supply inferred from the appearance of another unit.

Step 4: Inspect, empty, seat, and zero the tanks correctly

Inspect the cabinet, wheels, gauges, screen, buttons, exchange hoses, drain hose, flushing ports, filter, fittings, seals, fill port, cleaning bottle, tank windows, cord, switch, and storage panels. Confirm that every cap and hose belongs to the intended circuit.

Empty the used-fluid tank into an approved labelled container before it approaches capacity. Remove incompatible fluid from the new side rather than using a customer’s transmission to purge it. Both internal tanks must sit correctly on their scale platforms, and the machine must remain level and stationary.

Use Electronic Scale Reset only when both tanks are empty, seated correctly, and free from outside contact. Never zero a loaded tank. A false zero corrupts the reference used to coordinate new and used quantities.

Step 5: Load enough exact-specification new ATF

With the power switch off, clean the new-fluid filling area. Add the verified ATF through the intended filling route using clean dedicated equipment, or use New Oil Tank Filling only with the exact external-hose routing described below. Prevent water, dirt, lint, used fluid, cleaner, or another ATF from entering the new side.

Confirm that the screen and physical tank indication respond plausibly. Keep the amount inside the tank’s usable limit and above the programmed exchange quantity with a controlled reserve for the machine path and final adjustment. Do not plan to add fluid while equal-volume exchange is active.

Step 6: Select adapters and open the approved cooler-line point

Use the vehicle procedure to identify a serviceable point between the transmission and its cooler circuit. Bring the system to the specified safe temperature and pressure condition, clean the area, place containment below it, and release residual pressure only as directed before opening the connection.

Match the adapter by thread, sealing face, diameter, locking method, and unrestricted flow—not by appearance alone. Some vehicles require a dedicated fitting not supplied in the general assortment. Replace one-time seals, clips, and retainers as specified, and avoid side-loading a rigid or aged cooler line.

Step 7: Build and inspect the closed fluid circuit

Connect the two ATF802 exchange hoses to the approved ends of the opened vehicle cooler circuit. Automatic direction detection means you do not need to guess supply and return direction before the machine configures flow, but it does not make the physical connection self-checking.

Lock every quick coupling and original retainer, then pull-test each joint by hand. Route both hoses with slack for normal engine movement while keeping them away from heat, sharp edges, wheels, axles, fans, belts, and lift contact. Make sure neither hose is twisted, kinked, pinched, or carrying the weight of an adapter.

Step 8: Apply nameplate power and perform a low-risk leak check

Keep the ATF802 power switch off while connecting the verified AC cable. Secure the cord so it cannot be pulled by vehicle, lift, cabinet, or foot movement. Confirm that both tanks remain undisturbed on their scales.

Start the vehicle only in the state specified by its service procedure. Keep driven wheels stationary unless the exact vehicle procedure requires a different condition and the lift, restraint, ventilation, wheel-clearance, and workshop controls are rated for it. Inspect all cooler-line and machine joints for leakage before switching on the ATF802.

Turn on the machine, allow the screen to initialize, and watch for warnings or implausible values. If the displayed tank quantity, pressure, fluid path, or software state does not match the physical machine, switch off and resolve the discrepancy.

Step 9: Choose the operating mode, exchange function and quantity

On first startup, choose Standard Mode for fuller prompts and guidance. Simplified Mode reduces interface detail and is better reserved for an experienced operator who already knows the exact workflow. Mode Selection remains available under Maintenance & Settings.

Select Circulating Oil Exchange for the normal equal-volume service. Choose either Custom Exchange Volume or the vehicle-database path. If using the database, navigate the displayed series, brand, model, and year, then compare the suggested quantity with the transmission code and current service information. Reject any mismatch.

Read the entire prompt before confirmation. The set quantity must not exceed the verified new-fluid amount or the available used-fluid capacity. Do not use a generic multiple of total capacity or an advertised replacement percentage as the target.

Step 10: Prove flow direction and stable operation before committing

With the vehicle in its approved operating state, start the selected function as prompted. Let the ATF802 identify the connected flow direction and establish both paths. Watch the two pressure gauges, screen values, fluid windows, tank indications, hoses, and every connection.

Normal pressure is vehicle-dependent; a gauge is a trend and fault-detection aid, not a universal target. Stop for a sudden rise or drop, stalled flow, severe pulsation, aeration, hose movement, leakage, pump noise, incorrect fluid direction, unstable scale data, or a new/used quantity difference that does not settle under the machine’s control.

Step 11: Run and supervise the equal-volume exchange

Continue only after the low-risk check passes. The separate new- and used-fluid pumps should move fresh ATF into the circuit while recovering old fluid under the machine’s scale control. Supervise the process continuously; never leave a powered ATF802 unattended.

Do not move, bump, lean on, or roll the cabinet while it is measuring tank weight. Do not add new ATF through the fill port during the active function. Keep the new side above its safe minimum and the used side below capacity. Watch both gauges, both fluid windows, screen values, hose routing, adapter retention, and leaks throughout the exchange.

Operate the selector only through the sequence, dwell, engine state, brake state, and wheel condition approved for that vehicle. Do not force a higher gear, apply throttle, or run raised driven wheels from a generic instruction. Some transmissions require special scan-tool commands or prohibit particular conditions.

Step 12: Pause or stop through the screen and review settlement

Use the Confirm control to pause when the interface permits. When an end-warning dialog appears, read whether the selected choice returns to the active function or confirms termination. Do not disconnect power or open a pressurized coupling as the normal way to stop.

End early for any safety or fluid-control concern. At the Settlement page, record the actual new and used amounts. A small machine rating does not excuse a growing imbalance, and a balanced display does not replace the vehicle’s final level check.

Step 13: Restore the vehicle cooler circuit

Switch off the ATF802 and bring the vehicle circuit to the specified safe pressure and temperature condition. Position containment below the connections. Release each machine coupling carefully, cap the machine hoses immediately, and protect the open vehicle ends from contamination.

Reassemble the original cooler circuit with the required new seals, clips, retainers, and fittings. Support the line naturally and use the specified torque. Clean the area so a fresh leak can be identified. Do not reuse a distorted seal or damaged quick-connector lock merely because it appears to hold while stationary.

Step 14: Set final level, verify operation, and close the job

Follow the vehicle’s final-level procedure from the beginning. Hold the vehicle at the specified attitude, monitor transmission-fluid temperature with the required method, use the exact engine and selector state, and add or drain only the verified ATF. Do not default to Park, a cold dipstick mark, or a generic engine-running rule.

Run the engine and inspect the restored cooler connection, pan, fill or level point, and every disturbed area. Confirm normal engagement and scan data before a controlled road test. Perform adaptation or relearn only when the vehicle procedure requires it. Recheck for leaks and level under the specified return condition.

Drain the used-fluid tank promptly into a labelled waste container. Empty incompatible remaining new fluid into a clean labelled container. Wipe the machine, inspect the filter and hoses, record fluid lot, quantities, temperatures, codes, repairs, final level, leaks, and test result, then store the cabinet dry with both tanks empty.

Use Pipe Self-Flushing to control cross-contamination

Pipe Self-Flushing cleans the ATF802’s own exchange hoses with new fluid. It is an internal machine utility, not a vehicle flush. Disconnect the machine from the vehicle, connect the two exchange hoses only to the labelled self-flushing ports, confirm compatible new fluid is available, choose Pipe Self-Flushing, read the prompt, and start with the Confirm control.

Collect or account for the displaced fluid as the machine instructions require. After completion, cap the hoses and ports to prevent dirt entry. This process helps manage residue in the machine paths, but it does not make mixed fluids compatible or clean a contaminated new tank automatically.

Use the recovery, filling, and tank functions without cross-routing

The utility menus move fluid through different paths. Verify the exact hose routing and engine state before pressing Confirm.

Function	Intended task	Critical control
Old Oil Recovery	Recover a programmed amount from the connected vehicle	Keep within used-tank capacity; a zero setting requires manual stop
New Oil Filling	Add a programmed amount to the connected transmission	Keep the engine off; quantity cannot exceed available new fluid
New Oil Tank Emptying	Drain the machine’s new-fluid tank to an external container	Use the specified transparent hose; leave the other exchange hose unconnected
Old Oil Tank Emptying	Drain the machine’s used-fluid tank to an external container	Connect the drain hose, open its manual valve, and leave exchange hoses unconnected
New Oil Tank Filling	Draw new fluid from an external container into the machine tank	Use the cleaning-fluid suction route and stay within new-tank capacity

Never select a vehicle service function when the vehicle circuit is not connected. Conversely, do not leave the vehicle connected while routing hoses for an internal tank-emptying or pipe-self-flushing task.

Treat chemical circulating flushing as an optional specialist procedure

Circulating Flushing is separate from the normal correct-fluid exchange. A generic cleaner can affect friction materials, seals, coatings, fluid chemistry, and final ATF compatibility. Do not assume that a cleaning bottle, menu, or timer makes the chemistry suitable.

Use a chemical only when the transmission manufacturer, chemical supplier, and delivered ATF802 instructions all approve the exact product, dose, temperature, operating state, recovery method, and final exchange. Otherwise omit chemical circulation and perform the approved ATF service. No fixed duration or selector routine is universal.

Three completion gates before releasing the vehicle

Gate 1: Fluid control

The exact ATF is documented. Actual new and used quantities are recorded. Final level is correct inside the specified temperature window. No wrong-fluid, cross-contamination, aeration, overfill, or underfill concern remains.

Gate 2: Mechanical and hydraulic integrity

Every original cooler connection is restored with correct sealing and retention. Hoses and fittings are routed normally. The vehicle and ATF802 show no leak, abnormal pressure, blocked flow, damaged line, or loose component.

Gate 3: Vehicle and machine verification

The transmission engages and operates as expected, relevant data and codes are acceptable, and any required adaptation is complete. The ATF802 used tank is drained, incompatible new fluid is removed, scale platforms are clean, hoses are capped, and the service record is complete.

Troubleshooting ATF802 operation

The machine will not start the selected exchange

Confirm the power switch, nameplate supply, fuse or circuit protection, screen state, selected function, sufficient new fluid, available used-tank capacity, tank seating, scale readings, and completed prompt. If a value is implausible, do not bypass it—correct the cause or obtain service support.

Flow direction is detected but fluid movement is unstable

Stop the function. Check for a kinked hose, incomplete coupling, incorrect or restricted adapter, closed vehicle path, low new-fluid level, full used tank, aeration, filter restriction, pump fault, or unsupported vehicle operating state. Do not increase throttle to force flow.

New and used quantities do not remain controlled

Pause and inspect for cabinet movement, an object touching a tank, a loaded tank that was incorrectly zeroed, leakage, air, restricted flow, low new fluid, full used capacity, or the wrong function. Do not compensate by pouring fluid into the active tank.

Pressure changes sharply

Stop before a hose or seal is overloaded. Compare both gauges, screen behavior, fluid windows, vehicle state, and connection routing. A sharp change can indicate a restriction, selector-related circuit change, cooler issue, adapter problem, aeration, or stalled pump; diagnose instead of applying a universal pressure target.

New Oil Filling does not proceed

Verify that the engine is off, the selected quantity does not exceed new-fluid availability, the vehicle connection is correct, and the prompt has been confirmed. Do not start the engine to “help” this function.

Maintain the ATF802 for repeatable measurements

After each job, drain used fluid promptly, remove incompatible new fluid, clean spills, cap every port, inspect hoses and seals, and keep the scale platforms free from debris or side contact. Store the machine upright in a dry, ventilated area with both tanks empty and the cord protected.

Inspect the filter, electrical cable, fittings, gauges, wheels, cabinet, and chemical-contact areas regularly. Replace damaged parts before another vehicle is connected. The ATF802 instructions recommend replacing the filter after 50 transmission-fluid services; use Filter Reset only after the filter has actually been replaced.

Electronic Scale Reset requires both tanks empty and correctly seated. Factory Settings is not a routine cure for a fault because it also restores the scale’s factory calibration state. Record software and hardware information from About the Machine before service or update work.

ATF802 FAQ

Does automatic direction detection mean either hose connection is always safe?

No. It helps the machine configure flow direction after a correct sealed series connection is built. It cannot approve an adapter, repair a restricted cooler line, prevent leakage, or make an unsupported service point acceptable.

Should I trust the vehicle database quantity without checking?

No. Match the transmission code, build, service information, and actual procedure. Database selection is a convenience, not authority for fluid chemistry, capacity, final level, selector state, or modifications.

How much ATF should I exchange?

Use the documented vehicle plan, not a universal multiplier or percentage. Stay within both machine tank limits, maintain a reserve, record actual settlement values, and finish with the vehicle-specific temperature-dependent level check.

Can I add ATF while Circulating Oil Exchange is running?

No. Stop and complete the function before adding fluid. Adding to the measured tank during active equal-volume control can corrupt the balance.

Should the driven wheels be raised and accelerated through the gears?

Only when the exact vehicle procedure requires a defined wheel or driveline condition and the workshop equipment and restraints are rated for it. The safe default is stationary driven wheels; never force speed or gear changes from a generic instruction.

Is Circulating Flushing required before every exchange?

No. Chemical flushing requires explicit compatibility and process approval. Pipe Self-Flushing, by contrast, is an internal machine-hose cleaning function that can help prevent cross-contamination when routed exactly to the labelled ports.

Can New Oil Filling run with the engine on?

No. The ATF802 instructions require the engine to remain off during New Oil Filling. Select the correct programmed amount and verify final level later with the vehicle’s complete procedure.

The reliable ATF802 workflow

Start with diagnosis and exact vehicle data. Prepare clean, correctly seated machine tanks on a level stationary cabinet. Match nameplate power, select full-flow adapters, build a sealed cooler-line series circuit, and use Standard Mode until the prompts are familiar. Validate the exchange quantity, prove stable flow, then supervise both pumps, scales, gauges, windows, hoses, and tank margins until the planned amount is complete.

Finish the job outside the machine menu: restore the original cooler circuit, set fluid level at the specified temperature, verify operation and leaks, document the result, drain waste, segregate remaining fluid, and leave the ATF802 clean, empty, capped, and ready for a known fluid on the next vehicle.