ASE 2026 Practice Examination:
Automotive Technician (A-Series & L3)|||
questions and answers with
rationales/graded A+/2026 update/100%
correct answers rationales.
**1. A 2026 direct-injection gasoline engine exhibits high carbon
buildup on intake valves despite having port injection. Tech A says this
is normal for all GDI engines. Tech B says an auxiliary port injector
during light load can reduce this. Who is correct?**
a) Tech A only
b) Tech B only
c) Both A and B
d) Neither A nor B
**Correct Answer: b) Tech B only**
*Rationale: Modern GDI engines (2024–2026) use dual injection (port +
direct) to wash valves during low load. Tech A is wrong because not all
GDI engines have excessive buildup if they have port injection assist .*
**2. A 2026 vehicle with a start-stop system cranks slowly when
restarting at a traffic light. The battery is a 48V lithium-ion. Which is the
most likely cause?**
a) Low engine oil pressure
b) Failed 12V starter motor
,c) Degraded DC-DC converter output to 48V battery
d) Clogged EGR valve
**Correct Answer: c) Degraded DC-DC converter output to 48V
battery**
*Rationale: 48V mild hybrids rely on the DC-DC converter to maintain
the 48V battery. Slow cranking indicates low 48V charge .*
**3. A cylinder leakage test shows 40% leakage past the rings on
cylinder #3. Tech A says perform a wet compression test. Tech B says
the engine needs piston ring replacement. Who is correct?**
a) Tech A only
b) Tech B only
c) Both A and B
d) Neither A nor B
**Correct Answer: c) Both A and B**
*Rationale: A wet test confirms ring leakage (if compression rises), and
40% leakage typically requires ring/piston work .*
**4. A 2026 engine has variable valve lift (VVL) and continuously
variable valve timing (CVVT). DTC P0011 – Camshaft Position Timing
Over-Advanced. Tech A says check oil pressure and VVL solenoid. Tech
B says replace camshaft actuator. Who is correct?**
a) Tech A only
b) Tech B only
,c) Both A and B
d) Neither A nor B
**Correct Answer: a) Tech A only**
*Rationale: Low oil pressure or a stuck solenoid is far more common
than actuator failure. Replace only after diagnostics .*
**5. Which tool is essential for checking cylinder wall ovality in a 2026
aluminum block without removing the engine?**
a) Dial bore gauge
b) Cylinder leakage tester
c) Vacuum gauge
d) Compression tester
**Correct Answer: a) Dial bore gauge**
*Rationale: A dial bore gauge measures微小 variations in cylinder
diameter (ovality) to determine if the cylinder is out-of-round, crucial
for aluminum blocks .*
**6. A vacuum gauge reads steady 15 inHg at idle (normal 18-22).
When engine revs, vacuum drops to 5 then recovers slowly. Most
likely:**
a) Restricted exhaust
b) Stuck PCV valve
c) Weak valve springs
d) Intake manifold leak
, **Correct Answer: c) Weak valve springs**
*Rationale: Slow recovery after a snap throttle indicates weak valve
springs not closing properly at high RPM .*
**7. A 2026 engine has a variable displacement oil pump. DTC P06DA –
Oil pump control circuit low. Tech A says replace oil pump. Tech B says
check wiring to pump solenoid. Who is correct?**
a) Tech A only
b) Tech B only
c) Both A and B
d) Neither A nor B
**Correct Answer: b) Tech B only**
*Rationale: Circuit low usually means an open/shorted wire or poor
ground. Replace the pump only after electrical tests pass .*
**8. An engine has a sharp, metallic rapping noise specifically when
idling. The most likely cause is worn:**
a) Main bearings
b) Piston pins
c) Connecting rod bearings
d) Piston skirts
**Correct Answer: b) Piston pins**
Automotive Technician (A-Series & L3)|||
questions and answers with
rationales/graded A+/2026 update/100%
correct answers rationales.
**1. A 2026 direct-injection gasoline engine exhibits high carbon
buildup on intake valves despite having port injection. Tech A says this
is normal for all GDI engines. Tech B says an auxiliary port injector
during light load can reduce this. Who is correct?**
a) Tech A only
b) Tech B only
c) Both A and B
d) Neither A nor B
**Correct Answer: b) Tech B only**
*Rationale: Modern GDI engines (2024–2026) use dual injection (port +
direct) to wash valves during low load. Tech A is wrong because not all
GDI engines have excessive buildup if they have port injection assist .*
**2. A 2026 vehicle with a start-stop system cranks slowly when
restarting at a traffic light. The battery is a 48V lithium-ion. Which is the
most likely cause?**
a) Low engine oil pressure
b) Failed 12V starter motor
,c) Degraded DC-DC converter output to 48V battery
d) Clogged EGR valve
**Correct Answer: c) Degraded DC-DC converter output to 48V
battery**
*Rationale: 48V mild hybrids rely on the DC-DC converter to maintain
the 48V battery. Slow cranking indicates low 48V charge .*
**3. A cylinder leakage test shows 40% leakage past the rings on
cylinder #3. Tech A says perform a wet compression test. Tech B says
the engine needs piston ring replacement. Who is correct?**
a) Tech A only
b) Tech B only
c) Both A and B
d) Neither A nor B
**Correct Answer: c) Both A and B**
*Rationale: A wet test confirms ring leakage (if compression rises), and
40% leakage typically requires ring/piston work .*
**4. A 2026 engine has variable valve lift (VVL) and continuously
variable valve timing (CVVT). DTC P0011 – Camshaft Position Timing
Over-Advanced. Tech A says check oil pressure and VVL solenoid. Tech
B says replace camshaft actuator. Who is correct?**
a) Tech A only
b) Tech B only
,c) Both A and B
d) Neither A nor B
**Correct Answer: a) Tech A only**
*Rationale: Low oil pressure or a stuck solenoid is far more common
than actuator failure. Replace only after diagnostics .*
**5. Which tool is essential for checking cylinder wall ovality in a 2026
aluminum block without removing the engine?**
a) Dial bore gauge
b) Cylinder leakage tester
c) Vacuum gauge
d) Compression tester
**Correct Answer: a) Dial bore gauge**
*Rationale: A dial bore gauge measures微小 variations in cylinder
diameter (ovality) to determine if the cylinder is out-of-round, crucial
for aluminum blocks .*
**6. A vacuum gauge reads steady 15 inHg at idle (normal 18-22).
When engine revs, vacuum drops to 5 then recovers slowly. Most
likely:**
a) Restricted exhaust
b) Stuck PCV valve
c) Weak valve springs
d) Intake manifold leak
, **Correct Answer: c) Weak valve springs**
*Rationale: Slow recovery after a snap throttle indicates weak valve
springs not closing properly at high RPM .*
**7. A 2026 engine has a variable displacement oil pump. DTC P06DA –
Oil pump control circuit low. Tech A says replace oil pump. Tech B says
check wiring to pump solenoid. Who is correct?**
a) Tech A only
b) Tech B only
c) Both A and B
d) Neither A nor B
**Correct Answer: b) Tech B only**
*Rationale: Circuit low usually means an open/shorted wire or poor
ground. Replace the pump only after electrical tests pass .*
**8. An engine has a sharp, metallic rapping noise specifically when
idling. The most likely cause is worn:**
a) Main bearings
b) Piston pins
c) Connecting rod bearings
d) Piston skirts
**Correct Answer: b) Piston pins**
