The G1 covers the stuff you do every day in a shop: brakes, batteries, belts, fluids, tires, A/C, suspension, and basic electrical. A lot of techs take it first because it hits a little of everything.
These 15 questions come from all over the G1. If you've been turning wrenches for a while, most of these should feel familiar. The ones you miss are a good list of what to brush up on.
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Question 1 of 15
Technician A says an off-center steering wheel is best fixed by removing the wheel and moving it on its splines. Technician B says a crooked steering wheel can result from the front toe being set unevenly side to side. Who is correct?
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Answer: B. B only
Moving the steering wheel on its splines hides the real problem and can upset the steering angle sensor and clockspring. Technician A is wrong. If individual toe is uneven, the wheels steer slightly off center when the steering wheel is straight. Technician B is right.
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Question 2 of 15
An ohmmeter connected across a fuse removed from its holder reads OL. What does this mean?
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Answer: B. The fuse is open
OL (over limit) means resistance is too high to measure: there's no continuity. A good fuse reads near 0 ohms; OL means the fuse element is broken. Ohmmeter checks are made with the part out of the circuit or with power off.
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Question 3 of 15
Brake fluid is found behind a wheel cylinder's dust boot. Technician A says tightening the wheel cylinder's bleeder screw will stop the leak. Technician B says the leak can contaminate the shoes, which then must be replaced. Who is correct?
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Answer: B. B only
Fluid behind the dust boot means the wheel cylinder is leaking past its piston cups, so tightening the bleeder won't stop it. Technician A is wrong. Leaking fluid soaks the linings, which can't be cleaned and are replaced. Technician B is right.
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Question 4 of 15
Technician A says the alternator's output (B+) wire is live only with the ignition on. Technician B says an alternator can be tested by disconnecting the battery while the engine runs. Who is correct?
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Answer: D. Neither A nor B
The alternator output wire is connected straight to the battery, so it's always live; the negative battery cable is disconnected before alternator work. Technician A is wrong. Disconnecting a battery with the engine running can spike system voltage and damage modules; output is tested with a load tester. Technician B is wrong.
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Question 5 of 15
How is an A/C system charged to the correct amount of refrigerant?
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Answer: A. By weight, to the amount on the label
Modern systems hold a small, specific amount of refrigerant, shown on the under-hood label. After evacuation, the charging machine adds that amount by weight. Pressures are checked afterward to confirm the system works.
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Question 6 of 15
After a caliper is replaced, the brake pedal feels spongy and travels farther than before. The fluid level is full and there are no leaks. What is the most likely cause?
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Answer: B. Air left in the hydraulic system
Opening the hydraulic system to replace a caliper lets air in. Air compresses, so the pedal feels spongy and travels farther. The system is bled as service information directs, with the caliper's bleeder at the top, then pedal feel, fluid level and the absence of leaks are verified before the vehicle is driven.
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Question 7 of 15
A customer asks for 10W-30 oil. Service information and the oil filler cap for this engine call for 0W-20 meeting the manufacturer's oil specification. What should the technician do?
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Answer: C. Use the specified 0W-20 and explain why
Engine oil is chosen by the viscosity grade and specification in service information, often also printed on the filler cap. Modern engines with tight clearances and variable valve timing are designed around that oil. The technician should use 0W-20 and explain the reason.
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Question 8 of 15
A tire has scalloped dips worn around the tread, like cups spaced around the tire. The shock absorbers on that axle are leaking and fail a bounce test. What is the most likely cause?
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Answer: C. Worn shocks or struts
When shocks or struts can't control the wheel, the tire bounces as it rolls and scuffs the tread in spots, leaving cupped dips. Here the dampers have failed their check. Balance is also checked, since imbalance can cause cupping too, and the tire is replaced if the wear is severe.
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Question 9 of 15
Technician A says the fluid named in service information, such as a specific ATF or CVT fluid, should be used. Technician B says CVT fluid and conventional ATF can be used interchangeably. Who is correct?
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Answer: A. A only
Each transmission is designed for a specific fluid, named in service information and often on the dipstick. Technician A is right. CVTs use a fluid with friction properties made for the belt or chain and pulleys; conventional ATF in a CVT, or the reverse, can cause slipping and damage. Technician B is wrong.
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Question 10 of 15
After a toe adjustment, what must be done with the tie rod adjusting sleeve clamps?
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Answer: D. Clock and torque as specified
The clamps lock the adjusting sleeve so toe can't change. After toe is set, they're rotated to the position service information specifies and torqued to specification.
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Question 11 of 15
Technician A says DTCs and freeze frame data should be recorded before any codes are cleared. Technician B says a DTC beginning with P0 is a generic code and one beginning with P1 is manufacturer-specific. Who is correct?
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Answer: C. Both A and B
Clearing codes with a scan tool erases ordinary DTCs and their freeze frame data, so both are recorded first. (Permanent DTCs aren't erased by clearing.) Technician A is right. In OBD II powertrain codes, P0 codes are generic and defined the same way for all makes, and P1 codes are defined by the manufacturer. Technician B is right.
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Question 12 of 15
Technician A says one broken wheel stud can be left out if the other lug nuts are tightened extra tight. Technician B says lug nuts should be tightened with an impact wrench at full power. Who is correct?
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Answer: D. Neither A nor B
A missing stud overloads the others, and overtightening stretches them and can warp the rotor. The broken stud is replaced. Technician A is wrong. Full-power impact tightening overtightens and distorts parts; lug nuts are torqued to specification in a star pattern. Technician B is wrong.
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Question 13 of 15
Technician A says torsion bars are often marked left and right and aren't interchangeable. Technician B says front ride height on a torsion bar suspension is adjusted with coil spring spacers. Who is correct?
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Answer: A. A only
Torsion bars are often prestressed to twist in one direction, so they're marked for each side and can't be swapped. Technician A is right. Ride height is adjusted at the torsion bar adjusters. Technician B is wrong.
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Question 14 of 15
What does positive caster mainly provide?
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Answer: A. Stability and steering return
Positive caster places the tire's contact patch behind the steering axis, so the wheels tend to follow straight ahead. It gives straight-line stability and helps the steering return to center after a turn.
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Question 15 of 15
After the turn signal bulbs are replaced with LED bulbs, the signals flash rapidly. Why?
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Answer: A. LEDs draw too little current
LED bulbs draw much less current than incandescent bulbs. On systems that detect a burned-out bulb by current, the flasher or module sees the low current as an outage and flashes rapidly. The fix is what service information allows, such as an LED-compatible flasher or a module setting; load resistors are used only where approved.
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Since the G1 is so broad, don't just look at your score. Look at which systems you missed. Two misses in the same area tells you where to study next.
Want to go deeper on one system? The A-series tests below go way further into each area.
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