Are flashcards effective for the ASE G1 test?

Yes. Flashcards use active recall — retrieving an answer from memory — which research shows is one of the most effective study methods, especially in short, spaced sessions. Because G1 is broad and rewards instant recall of services, components, and diagnostic clues across many systems, the cards make that knowledge automatic.

What topics do the ASE G1 flashcards cover?

All seven content areas: engine systems (oil, viscosity, belts, cooling, plugs), automatic transmission (fluid service, shift symptoms), manual drive train (clutch, CV joints, differential), suspension and steering (shocks, ball joints, alignment, tires, TPMS), brakes (pads, rotors, fluid, ABS), electrical (battery, charging, voltage drop), and HVAC (A/C, cabin filter, heater core).

How should I study with these ASE G1 flashcards?

Lead with Suspension and Steering and Brakes — together they're nearly half the scored test — then Engine Systems and Electrical. Mix the modes: flip to learn, type to test recall, match for speed, and quiz to check yourself before working full practice questions.

Are the ASE G1 flashcards free?

Yes — 100% free, all four study modes, no paywall.

Do these flashcards match the current ASE G1 test?

Yes. The cards are organized to ASE's current G1 Auto Maintenance and Light Repair content areas and reflect the maintenance, light-repair, and diagnostic knowledge the test measures across the seven areas.

Oil's resistance to flow. In 5W-30, the W number is the cold-flow rating and the second number is the thickness at operating temperature.

Multigrade oil (5W-30)

Flows like a 5-weight when cold (the W) for easy starts and protects like a 30-weight at operating temperature.

A system that estimates remaining oil life from engine data and signals when an oil change is due, replacing a fixed-mileage interval.

Follow the owner's manual or oil-life monitor — commonly 5,000–10,000 miles on synthetic oil; oil degrades by both miles and time.

Checking engine oil level

Park on level ground, shut the engine off, wait a few minutes, then wipe, reinsert, and read the dipstick for an accurate level.

Traps contaminants from circulating oil; replaced with every oil change. A clogged filter can open a bypass and pass unfiltered oil.

Synthetic vs conventional oil

Synthetic oil resists breakdown better and usually allows longer change intervals; always use the grade and spec the manufacturer requires.

Delivers the spark that ignites the air-fuel mixture. Worn or fouled plugs cause rough idle, hesitation, and poor fuel economy.

Iridium/long-life spark plug

A long-life plug commonly replaced near 90,000–100,000 miles; always confirm the exact interval in the maintenance schedule.

A plug coated with oil, fuel, or carbon that misfires; causes rough idle and poor power and should be diagnosed, not just replaced.

One multi-ribbed belt that drives accessories — alternator, A/C compressor, power-steering pump, and often the water pump.

A spring-loaded pulley that keeps the serpentine belt tight. A weak tensioner causes belt squeal and slipping.

Usually a slipping serpentine belt or a weak/worn tensioner — not always a worn belt.

Modern belts wear by losing rib material rather than cracking; check with a belt wear gauge.

A water-and-glycol mix that transfers heat and protects against freezing/corrosion. A 50/50 mix protects to about −34°C (−29°F).

Checking coolant level

Check cold at the reservoir; never open a hot radiator or pressure cap — escaping steam can cause burns.

A temperature valve that blocks flow to the radiator until the engine warms. Stuck closed = overheating; stuck open = runs too cool.

Seals and pressurizes the cooling system, raising the coolant's boiling point so the engine can run hotter without boiling.

The belt- or chain-driven pump that circulates coolant through the engine and radiator.

Often a leaking head gasket letting oil and coolant passages mix; refer for deeper repair.

Cleans intake air. A clogged air filter restricts airflow, richens the mixture, and can hurt economy and power.

Positive Crankcase Ventilation — routes blow-by gases from the crankcase back to the intake to be burned, cutting pressure and emissions.

Reads oxygen in the exhaust so the computer can keep the air-fuel ratio near the ideal 14.7:1 (stoichiometric).

The ideal air-fuel ratio for gasoline — about 14.7 parts air to 1 part fuel by weight.

An exhaust device that converts CO, hydrocarbons, and NOx into harmless CO₂, water, nitrogen, and oxygen.

Flashing check-engine light

An active misfire severe enough to damage the catalytic converter — stop and diagnose the misfire.

Steady check-engine light

A stored emissions-related fault that is not an immediate threat; retrieve the code and diagnose.

Measures cranking pressure per cylinder to judge sealing of rings, valves, and head gasket; readings should be within about 10%.

Uncontrolled combustion after the spark, from low octane, too much advance, lean mixture, carbon, or overheating; the knock sensor retards timing.

Detects detonation so the computer can retard ignition timing and protect the engine.

Pulls air through the radiator at low speed/idle; an inoperative fan causes overheating in traffic but not at highway speed.

Heat the combustion chamber on a diesel engine to aid cold starting; diesels have no spark ignition.

Keeps the camshaft in time with the crankshaft; a failure on an interference engine can bend valves and stop compression.

Mass airflow (MAF) sensor

Measures intake air so the computer can meter the right fuel; a dirty MAF can cause misfires and poor drivability.

Forced induction; less-than-expected boost is often a wastegate or control-system problem, checked first.

A cylinder failing to fire — from ignition, fuel, or compression loss — causing rough idle, poor power, and a check-engine light.

Unmetered air entering the intake; leans the mixture and causes a rough or high idle.

Sprays metered fuel into the intake or cylinder; a clogged or stuck injector causes a misfire or flooding.

Engine overheating at high speed

A partially obstructed radiator restricts flow and shows up most under high load and speed.

Resetting maintenance reminder

After an oil/maintenance service, reset the oil-life or maintenance reminder so the system tracks the next interval correctly.

Automatic transmission fluid (ATF)

The specified fluid an automatic uses for hydraulic control, lubrication, and cooling. Low or burnt ATF causes slipping and harsh shifts.

Check by the manufacturer's method — dipstick or a sealed check plug at a specified temperature; some units have no dipstick.

A burnt smell or very dark fluid signals overheating and the need for transmission service.

Using a fluid that doesn't meet the manufacturer's spec can cause harsh or erratic shifting.

Causes slipping, delayed engagement, and overheating; it is the first thing to check for transmission complaints.

Your FREE ASE G1 Flashcards 2026 – 200+ Cards

Realistic ASE G1 Auto Maintenance & Light Repair flashcards across all seven content areas — flip, match, type, and quiz yourself on the services, components, and specs you must know cold.

How well do you know them?

ASE G1 Flashcards

Oil viscosity (SAE): Oil's resistance to flow. In 5W-30, the W number is the cold-flow rating and the second number is the thickness at operating temperature.
Multigrade oil (5W-30): Flows like a 5-weight when cold (the W) for easy starts and protects like a 30-weight at operating temperature.
Oil-life monitor: A system that estimates remaining oil life from engine data and signals when an oil change is due, replacing a fixed-mileage interval.
Oil change interval: Follow the owner's manual or oil-life monitor — commonly 5,000–10,000 miles on synthetic oil; oil degrades by both miles and time.
Checking engine oil level: Park on level ground, shut the engine off, wait a few minutes, then wipe, reinsert, and read the dipstick for an accurate level.
Engine oil filter: Traps contaminants from circulating oil; replaced with every oil change. A clogged filter can open a bypass and pass unfiltered oil.
Synthetic vs conventional oil: Synthetic oil resists breakdown better and usually allows longer change intervals; always use the grade and spec the manufacturer requires.
Spark plug: Delivers the spark that ignites the air-fuel mixture. Worn or fouled plugs cause rough idle, hesitation, and poor fuel economy.
Iridium/long-life spark plug: A long-life plug commonly replaced near 90,000–100,000 miles; always confirm the exact interval in the maintenance schedule.
Fouled spark plug: A plug coated with oil, fuel, or carbon that misfires; causes rough idle and poor power and should be diagnosed, not just replaced.
Serpentine belt: One multi-ribbed belt that drives accessories — alternator, A/C compressor, power-steering pump, and often the water pump.
Belt tensioner: A spring-loaded pulley that keeps the serpentine belt tight. A weak tensioner causes belt squeal and slipping.
Belt squeal: Usually a slipping serpentine belt or a weak/worn tensioner — not always a worn belt.
EPDM belt wear: Modern belts wear by losing rib material rather than cracking; check with a belt wear gauge.
Coolant (antifreeze): A water-and-glycol mix that transfers heat and protects against freezing/corrosion. A 50/50 mix protects to about −34°C (−29°F).
Checking coolant level: Check cold at the reservoir; never open a hot radiator or pressure cap — escaping steam can cause burns.
Thermostat: A temperature valve that blocks flow to the radiator until the engine warms. Stuck closed = overheating; stuck open = runs too cool.
Radiator cap: Seals and pressurizes the cooling system, raising the coolant's boiling point so the engine can run hotter without boiling.
Water pump: The belt- or chain-driven pump that circulates coolant through the engine and radiator.
Oil in the coolant: Often a leaking head gasket letting oil and coolant passages mix; refer for deeper repair.
Engine air filter: Cleans intake air. A clogged air filter restricts airflow, richens the mixture, and can hurt economy and power.
PCV system: Positive Crankcase Ventilation — routes blow-by gases from the crankcase back to the intake to be burned, cutting pressure and emissions.
Oxygen sensor: Reads oxygen in the exhaust so the computer can keep the air-fuel ratio near the ideal 14.7:1 (stoichiometric).
Stoichiometric ratio: The ideal air-fuel ratio for gasoline — about 14.7 parts air to 1 part fuel by weight.
Catalytic converter: An exhaust device that converts CO, hydrocarbons, and NOx into harmless CO₂, water, nitrogen, and oxygen.
Flashing check-engine light: An active misfire severe enough to damage the catalytic converter — stop and diagnose the misfire.
Steady check-engine light: A stored emissions-related fault that is not an immediate threat; retrieve the code and diagnose.
Compression test: Measures cranking pressure per cylinder to judge sealing of rings, valves, and head gasket; readings should be within about 10%.
Detonation (knock): Uncontrolled combustion after the spark, from low octane, too much advance, lean mixture, carbon, or overheating; the knock sensor retards timing.
Knock sensor: Detects detonation so the computer can retard ignition timing and protect the engine.
Engine cooling fan: Pulls air through the radiator at low speed/idle; an inoperative fan causes overheating in traffic but not at highway speed.
Glow plugs: Heat the combustion chamber on a diesel engine to aid cold starting; diesels have no spark ignition.
Timing belt/chain: Keeps the camshaft in time with the crankshaft; a failure on an interference engine can bend valves and stop compression.
Mass airflow (MAF) sensor: Measures intake air so the computer can meter the right fuel; a dirty MAF can cause misfires and poor drivability.
Turbocharger boost: Forced induction; less-than-expected boost is often a wastegate or control-system problem, checked first.
Engine misfire: A cylinder failing to fire — from ignition, fuel, or compression loss — causing rough idle, poor power, and a check-engine light.
Vacuum leak: Unmetered air entering the intake; leans the mixture and causes a rough or high idle.
Fuel injector: Sprays metered fuel into the intake or cylinder; a clogged or stuck injector causes a misfire or flooding.
Engine overheating at high speed: A partially obstructed radiator restricts flow and shows up most under high load and speed.
Resetting maintenance reminder: After an oil/maintenance service, reset the oil-life or maintenance reminder so the system tracks the next interval correctly.
Automatic transmission fluid (ATF): The specified fluid an automatic uses for hydraulic control, lubrication, and cooling. Low or burnt ATF causes slipping and harsh shifts.
Checking ATF level: Check by the manufacturer's method — dipstick or a sealed check plug at a specified temperature; some units have no dipstick.
Burnt ATF: A burnt smell or very dark fluid signals overheating and the need for transmission service.
Wrong ATF type: Using a fluid that doesn't meet the manufacturer's spec can cause harsh or erratic shifting.
Low ATF level: Causes slipping, delayed engagement, and overheating; it is the first thing to check for transmission complaints.
Torque converter: A fluid coupling that transmits engine power to the transmission and multiplies torque; a slipping converter hurts economy and adds heat.
Torque converter clutch (TCC): Locks the converter at cruise to eliminate slip and improve fuel economy.
Planetary gearset: The gear arrangement inside an automatic that provides the different gear ratios and reverse.
Shift solenoid: An electrically controlled valve that directs fluid to shift gears; a faulty solenoid can cause harsh or missed shifts.
Pressure control solenoid: Regulates line pressure; a defective one causes harsh or erratic shifting.
Low line pressure: Causes early, soft shifts because clutches and bands cannot engage firmly.
Transmission filter: Strains the ATF; a restricted filter causes delayed engagement and a whining pump.
Valve body: The hydraulic control center of an automatic; sticking valves (often when cold) cause delayed engagement.
Transmission control module (TCM): The computer that controls shifting; scanning it for codes helps diagnose electronic shift faults.
Slipping in overdrive: Often a loose overdrive band or worn clutch pack — the transmission slips momentarily on the OD shift.
Delayed engagement when cold: Often sticking valves in the valve body that free up as the transmission warms.
No movement in any gear: Check ATF level first — a low level is the most common and simplest cause.
Reverse clutch pack: Engages reverse gear; a failure can leave reverse inoperative while forward gears work.
Forward clutch: Engages forward gears; if not seated, the transmission has no forward movement but reverse may work.
Transmission cooler: Routes ATF through a cooler (often in the radiator) to control fluid temperature.
ATF service: Drain-and-fill or full exchange with the specified fluid; follow the maintenance schedule's interval.
Limp-in mode: A protective default to one gear when the TCM detects a serious fault, to let the vehicle reach a shop.
Clutch: Connects and disconnects engine power to a manual transmission; lets the driver change gears and start from a stop.
Clutch disc: The friction plate clamped between the flywheel and pressure plate; wear causes slipping and a high engagement point.
Pressure plate: Clamps the clutch disc to the flywheel; releasing it disengages the clutch.
Throw-out (release) bearing: Pushes on the pressure plate fingers to disengage the clutch; a worn one whines when the pedal is pressed.
Pilot bearing: Supports the transmission input shaft in the crankshaft; a worn pilot bearing whines with the clutch engaged.
Air in hydraulic clutch: Prevents the clutch from fully releasing, making it hard to shift into all gears; bleed the system.
Synchronizer: Matches gear speeds so a manual transmission shifts smoothly; worn synchros cause grinding and popping out of gear.
Grinding into reverse: Often a faulty reverse idler gear — reverse usually has no synchronizer.
Pops out of gear: Worn or damaged synchronizers (or worn detents) let a manual transmission jump out of gear.
Constant-velocity (CV) joint: A flexible drive-axle joint that transmits power while allowing steering and suspension movement.
Torn CV boot: Lets grease out and dirt/water in, destroying the CV joint; inspect boots at every service.
CV joint clicking: A rhythmic click during tight turns is the classic worn outer CV joint symptom.
Driveshaft: Transmits power from the transmission to the rear axle on RWD vehicles; a bent shaft causes a speed-related vibration.
U-joint: A universal joint that lets the driveshaft flex; a worn U-joint causes a clunk on acceleration and a vibration.
Differential: A gearset that lets the drive wheels turn at different speeds, needed because the outer wheel travels farther in a turn.
Ring and pinion: The differential gears that turn drive from the driveshaft 90° to the axles and provide final gear reduction.
Metal in differential fluid: Metal flakes usually indicate failing differential bearings.
Gear oil: The lubricant for manual transmissions, transaxles, and differentials; low level causes noise and wear.
Transfer case: Splits drive to front and rear axles on 4WD vehicles; a defective shift motor can fail to engage 4WD.
Wheel bearing noise: A constant hum that changes with vehicle speed (not steering angle), unlike a CV joint click.
Clutch slipping: Engine RPM rises without matching acceleration; a worn clutch disc or oil-contaminated clutch is the cause.
Axle seal: Keeps gear oil in the differential/axle; a leaking seal causes fluid loss and possible contamination of nearby parts.
Camber: The inward/outward tilt of a wheel viewed from the front; excessive camber wears one edge of the tire.
Caster: The forward/rearward tilt of the steering axis viewed from the side; controls straight-line stability and steering return, not tire wear.
Toe: Whether the tires point in or out; incorrect toe is the most common cause of feathered tire wear.
Toe-in / toe-out: Toe-in: fronts of the tires point toward each other; toe-out: they point away. Wrong toe scrubs and feathers the tread.
Positive camber: The tops of the wheels tilt outward; excessive positive camber wears the outer edges of the tires.
Negative camber: The tops of the wheels tilt inward; excessive negative camber wears the inner edges of the tires.
Wheel alignment: Setting camber, caster, and toe to spec for even tire wear and stable handling; required after replacing related parts.
Tire rotation: Moving tires between positions for even wear and longer life; pattern depends on drive type and tire directionality.
Tire inflation source: Inflate to the door-jamb placard pressure, NOT the maximum stamped on the sidewall.
Checking tire pressure cold: Check when tires are cold — driving heats the air and raises the reading.
Under-inflation wear: Wears both edges/shoulders of the tread and runs the tire hot.
Over-inflation wear: Wears the center of the tread.
Feathered tire wear: A saw-tooth edge pattern caused by incorrect toe.
Cupping/scalloping: Uneven dips in the tread from worn shocks/struts or other suspension wear.
TPMS: Tire Pressure Monitoring System — warns of low pressure; many vehicles need a relearn after tire service.
Direct vs indirect TPMS: Direct uses a sensor in each wheel; indirect infers pressure from wheel-speed differences.
TPMS light solid vs flashing: A solid light means low tire pressure; a flashing light usually means a sensor or system fault.
Shock absorber: Damps spring oscillation; worn shocks cause excessive bounce, nose-dive, and tire cupping.
Strut / MacPherson strut: A combined shock and suspension upright that also serves as a steering pivot, common on front suspensions.
Coil spring: Supports vehicle weight and absorbs road shock; a broken/sagging spring lets a corner sit low.
Leaf spring: A stacked-blade spring (often rear); worn leaves let the rear sag.
Ball joint: A pivoting connection between control arm and knuckle; a worn one causes a clunk over bumps and uneven tire wear.
Control arm bushing: Cushions the control arm pivot; worn bushings cause clunks and alignment changes.
Sway bar (stabilizer) link: Connects the sway bar to the suspension; worn links rattle/clunk over bumps.
Tie rod end: Connects the steering linkage to the knuckle; wear causes excessive steering play and a bent tie rod alters toe.
Rack and pinion: A common steering gear that converts steering-wheel rotation to side-to-side motion; worn mounts cause a clunk.
Idler arm / pitman arm: Steering-linkage parts in a parallelogram system; wear causes play and wander.
Power steering pump: Provides hydraulic assist; a weak pump or low fluid causes hard steering, worst at low speed.
Electric power steering: Uses an electric motor instead of a hydraulic pump; no power-steering fluid to service.
Steering wheel shake at highway speed: Usually unbalanced wheels causing vibration felt through the wheel.
Off-center steering wheel: A steering wheel not centered when driving straight, often from a bent tie rod or an uncorrected alignment.
Excessive steering play: Often worn tie-rod ends or a worn steering gear; inspect linkage first.
Strut mount bearing: Lets the strut rotate with steering; a faulty bearing squeaks/binds during turns.
Wheel bearing: Supports the wheel and lets it spin; a worn bearing growls and changes with vehicle speed.
Clunk over bumps: Often worn ball joints, control-arm bushings, sway-bar links, or strut mounts.
Wheel balancing: Adding weights so a wheel/tire spins without vibration; imbalance causes shake at speed.
Ride height: The vehicle's resting height; a low corner indicates a weak or broken spring.
Steering damper: Dampens steering oscillation (common on trucks); not a tire-wear item.
Master cylinder: The pedal-operated hydraulic pump that sends pressurized fluid to all four wheels; an internal leak lets the pedal slowly sink.
Brake fluid (DOT): A hygroscopic hydraulic fluid (DOT 3/4/5.1) that absorbs moisture, lowering its boiling point; keep capped and change on schedule.
Hygroscopic brake fluid: Brake fluid absorbs water over time, which lowers the boiling point and can cause a spongy pedal under heavy use.
Brake bleeding: Removing air from the hydraulic system to cure a soft/spongy pedal.
Soft/spongy brake pedal: Usually air in the hydraulic system; bleed the brakes.
Sinking brake pedal: A pedal that slowly drops under steady pressure points to a failing master cylinder (internal leak).
Disc brake: Pads clamp a spinning rotor to stop the wheel; common on front axles and many rears.
Brake pad: The friction material that clamps the rotor; replace as a set per axle when worn.
Brake pad wear indicator: A metal tab that contacts the rotor when pads are thin, making a high-pitched squeal that warns of replacement.
Brake rotor (disc): The disc the pads clamp; a warped or thickness-varied rotor causes a pedal pulsation.
Rotor minimum thickness: The discard spec stamped on the rotor; a rotor below it must be replaced, not machined.
Brake pedal pulsation: A rhythmic pulse felt during braking from a warped or uneven-thickness rotor.
Brake caliper: Houses the pistons that press the pads against the rotor; a sticking caliper drags and can cause a pull.
Sticking caliper: Causes a brake drag, uneven pad/dust, and a pull — usually the vehicle pulls toward the OPPOSITE side that is sticking.
Brake pull: A pull to one side under braking, usually a sticking caliper on the opposite side or a hydraulic restriction.
Drum brake: A rear-brake design where shoes press outward against a rotating drum.
Brake shoes: The friction parts in a drum brake that press against the drum.
Wheel cylinder: The hydraulic actuator in a drum brake that pushes the shoes out; a leak contaminates the linings.
Self-adjuster (drum): Keeps drum-brake shoe-to-drum clearance correct as the linings wear.
Parking brake: A mechanical brake (cable or electric) that holds the vehicle; it must be adjusted for proper holding.
Brake booster: A vacuum- or hydraulically-assisted unit that multiplies pedal force; a failure makes the pedal very hard.
Hard brake pedal: Excessive pedal effort with adequate stopping usually means a failed booster or lost vacuum.
Vacuum booster check valve: Holds vacuum in the booster; a leak gives a soft pedal at start-up that firms once the engine runs.
Antilock braking system (ABS): Pulses brake pressure to keep wheels from locking during hard braking, preserving steering control.
ABS wheel speed sensor: Reports each wheel's speed to the ABS module; a faulty sensor can cause improper ABS operation.
ABS warning light: Lights for an ABS fault; first scan for ABS trouble codes before replacing parts.
Brake fade: Loss of braking from overheated pads/fluid; boiling fluid (water-laden) makes it worse.
Proportioning valve: Balances front/rear brake pressure to prevent rear lock-up under hard braking.
Residual pressure: A small held pressure that, if excessive, can cause brakes to drag and not fully release.
Brake dust: Pad/rotor wear dust; much less on one wheel can indicate a seized caliper there.
Squeal that stops when braking: A wear-indicator squeal at light braking that quiets when the pedal is firmly applied.
Measuring rotor runout: Checking lateral wobble with a dial indicator; excess runout causes pulsation.
Battery (12V): Stores electrical energy to crank the engine and run accessories when the engine is off.
Battery terminal corrosion: Adds resistance and can cause slow cranking and starting problems; clean and secure terminals as service.
Battery hold-down: Secures the battery to prevent vibration damage and shorts; tighten as routine service.
Battery load test: Applies a load to check the battery's ability to deliver cranking current; a conductance tester is also used.
Alternator: The belt-driven generator that charges the battery and powers loads, typically 13.5–14.5 volts running.
Charging-system check: Confirms the alternator keeps the battery charged at about 13.5–14.5 V at idle.
Battery warning light: On with the engine running, it indicates a charging-system problem (not just a low battery).
Headlights dim at idle: Dimming as RPM drops at idle suggests a failing alternator that cannot keep up at low speed.
Corroded alternator B+ terminal: Adds resistance and can leave the battery undercharged.
Starter motor: The electric motor that cranks the engine; draws high current through the starter circuit and solenoid.
Starter solenoid: An electromagnetic switch that engages the starter and connects high current to it.
Starter relay: A control relay in the starting circuit; a defective relay can prevent cranking.
Slow cranking (good battery): Usually high resistance in the starter circuit — corroded/loose cables or grounds.
Voltage-drop test: Measures voltage lost across a connection under load; above about 0.1 V on a ground means unwanted resistance.
Ground connection: The return path of a circuit; a poor ground causes dim lights, slow crank, and odd electrical faults.
Fuse: A sacrificial link that opens to protect a circuit from overcurrent; check the fuse first for a dead circuit.
Relay: An electrically operated switch that lets a small current control a larger one (fans, fuel pump, starter).
OBD-II / DLC: The on-board diagnostics connector for scan tools; check its fuse if the scan tool won't communicate.
Test light vs DMM: A test light shows presence of voltage; a digital multimeter measures exact volts, ohms, and amps.
Short circuit: An unintended low-resistance path that blows fuses or drains the battery.
Open circuit: A break in the circuit that stops current flow; the load won't operate.
Parasitic draw: Current drawn with the key off that drains the battery overnight; measured in milliamps.
Cooling fan relay (electrical): Controls the electric cooling fan; a shorted relay can run the fan constantly.
Headlight/bulb replacement: A common light repair; match the correct bulb type and avoid touching the glass on halogen bulbs.
Refrigerant: The fluid (R-1234yf or R-134a) an A/C system circulates to move heat from the cabin to outside; it must be recovered, never vented.
R-1234yf vs R-134a: R-1234yf is the newer low-GWP refrigerant in late-model vehicles; R-134a is older. They must not be mixed.
A/C compressor: Pumps and pressurizes refrigerant; its clutch engages it. A seized pulley bearing causes noise and belt slip.
A/C condenser: Sheds heat from high-pressure refrigerant (like a small radiator) at the front of the vehicle.
A/C evaporator: Absorbs cabin heat as refrigerant boils; condensation on it drains outside and can grow mold.
Expansion valve / orifice tube: Meters refrigerant into the evaporator, dropping its pressure so it can absorb heat.
Refrigerant recovery: Refrigerant must be captured with a recovery/recycling machine, never released to the atmosphere.
A/C system pressures: Checked with manifold gauges; abnormal high/low readings point to charge level or component faults.
Low refrigerant charge: Causes poor cooling; bubbles in a sight glass at idle can indicate a low charge.
Musty A/C odor: Mold or mildew growth on the evaporator and case; worsened by a clogged cabin filter or blocked drain.
Cabin air filter: Cleans air entering the cabin; when clogged it reduces airflow on all settings and can cause odors.
Weak airflow on all settings: A classic clogged cabin air filter symptom; replace the filter.
Evaporator drain: Carries condensation outside; a blocked drain leaves water in the case and can wet the carpet.
Heater core: A small radiator that uses hot engine coolant to warm cabin air.
Leaking heater core: Causes a sweet antifreeze smell, foggy windows, and sometimes wet carpet.
Heater control (blend) valve/door: Controls how much hot coolant/air reaches the cabin; a fault causes poor heat or temperature control.
Blend door actuator: A motor that positions the blend door for temperature/mode; a failure causes wrong temperature or mode.
Blower motor: Moves air through the HVAC system; a clogged cabin filter strains it and weakens airflow.
HVAC mode selection: Directs airflow to panel, floor, or defrost vents; a vacuum leak can default the system to defrost.
High-pressure cut-off switch: Shuts off the compressor on overpressure; a trip often points to poor condenser cooling (check the fans).
A/C short cycling: The compressor cycling on/off too often, commonly from a low refrigerant charge.
Defrost mode: Directs warm, dehumidified air to the windshield; the A/C often runs in defrost to remove moisture.

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By Career EmployerUpdated Sep 12, 2026

200+ free ASE G1 flashcards — 4 ways to study

ASE G1 Flashcard of the DayNew daily

The classic card. Do you know this one?

Click Study Flashcards above to open the flashcard hub — over two hundred ASE G1 cards you can flip, match, type, or quiz yourself on. Every card is drawn from the seven official Auto Maintenance & Light Repair content areas, so you study exactly what the test measures.^[1] Pair them with our free practice test and study guide.

ASE G1 is one of the 29 ASE certifications — explore our ASE flashcards to compare and prep across the whole family.

ASE G1 Flashcard Study Modes

Flip mode moves through cards one at a time so you can check yourself. Match is a timed game that pairs terms with their definitions. Type shows a definition and asks you to key the term back, so a card like Brake fade has to come from memory. Quiz builds multiple-choice questions from the same 200 cards.

Free ASE G1 flashcards from Career Employer — active recall for the ASE Auto Maintenance & Light Repair test

Why Flashcards Work for the ASE G1

Engine Systems is the largest block at 40 cards, and it drills the parts and symptoms a service writer hears about every day. You get component terms such as Thermostat, Water pump and PCV system alongside customer-facing complaints like Belt squeal, plus ignition and starting items including Spark plug and Glow plugs.

Suspension & Steering follows with 38 cards. Much of it is alignment vocabulary, where Toe, Camber and Caster have to be kept straight from each other, and the rest covers wear parts and hardware such as Ball joint, Tie rod end, Coil spring and Leaf spring, along with the card for TPMS.

Brakes carries 32 cards split between hardware and complaints. Hardware terms include Brake pad, Brake caliper, Brake shoes and the pairing of Disc brake with Drum brake, while the symptom side gives you Brake pull, Brake fade and Brake dust, which are the words that turn a vague description into a repair order.

Electrical runs 24 cards on charging, starting and diagnostic basics, from Fuse, Relay and Alternator to Battery (12V), Starter motor, Starter relay and the connector card for OBD-II / DLC, with Open circuit covering fault vocabulary. Automatic Transmission/Transaxle adds 22 cards on fluid and control terms such as Burnt ATF, Low ATF level, Shift solenoid, Valve body and Limp-in mode.

Manual Drive Train & Axles holds 22 cards on Clutch, Clutch disc, Synchronizer, U-joint, Driveshaft and failures like Torn CV boot or a leaking Axle seal. Heating, Ventilation & A/C also holds 22, covering Refrigerant, A/C compressor, A/C condenser, A/C evaporator, Heater core and complaints such as Musty A/C odor.

The ASE G1 test is broad, so it rewards instant recall of services, components, and diagnostic patterns across every system — what feathered tire wear means, when a CV joint clicks, how a wear indicator squeals, and what a voltage-drop reading tells you.^[2] Spaced flashcards are the most efficient way to make that knowledge automatic. Used alongside our practice test and study guide, they turn review time into measurable progress.

ASE G1 Flashcards by Content Area

The cards are organized by the seven official ASE G1 content areas. Drill the heaviest ones first — Suspension and Steering and Brakes are together nearly half the scored test, with Engine Systems and Electrical next:^[1]

ASE G1 flashcards by content area
Content area	What the cards cover
Engine Systems	Oil, viscosity, filters; coolant, belts, hoses; plugs, O₂ sensor, converter
Automatic Transmission/Transaxle	ATF level & condition, shift symptoms, fluid service
Manual Drive Train & Axles	Clutch, synchronizers, CV joints, driveshaft, differential
Suspension & Steering	Shocks, struts, ball joints; alignment angles; tire wear & TPMS
Brakes	Pads, rotors, shoes, drums; brake fluid; master cylinder, booster, ABS
Electrical	Battery & charging, alternator, starter, voltage-drop testing
Heating, Ventilation & A/C	Refrigerant, cabin air filter, evaporator, heater core, airflow

How to Get the Most Out of These Flashcards

Start with Engine Systems. At 40 cards it is the biggest domain in the deck, and its vocabulary for cooling, ignition and air leaks resurfaces in the electrical and drive train cards.
Type-drill the confusable pairs. Camber and Caster are easy to recognize in Flip and hard to reproduce cold, so force yourself to key them from the definition until they stop swapping.
Let Match handle symptom cards. Complaint terms like Brake pull and Belt squeal reward fast recognition, and the timed pairing keeps you from over-reading a description you already know.
Move to the practice test once Quiz stops surprising you. When multiple choice on Brakes and Suspension & Steering feels routine, you need full-length questions that combine domains instead of isolated terms.
Keep the cadence small and repeated. Work one domain per sitting, mix in a short Match round from an earlier domain, and cycle all 200 cards before repeating any single block.

ASE G1 Flashcards FAQ

Over two hundred free ASE G1 Auto Maintenance and Light Repair flashcards, organized across all seven official content areas: Engine Systems, Automatic Transmission/Transaxle, Manual Drive Train and Axles, Suspension and Steering, Brakes, Electrical, and Heating, Ventilation, and Air Conditioning. They're free with no account required.

References

1.ASE (National Institute for Automotive Service Excellence). “G1 Auto Maintenance and Light Repair Certification Test.” ASE. ↑
2.ASE. “The Official ASE Study Guide — Auto Maintenance and Light Repair (G1).” ASE. ↑
3.U.S. Environmental Protection Agency. “Transportation, Air Pollution & Emission Controls.” U.S. EPA. ↑

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