Year 3 Exam Study Guide — master what the exam actually tests, concept by concept.
Automotive and heavy equipment work involves fuel systems, hydraulics, high-voltage (in EV/hybrid vehicles), exhaust gases, and heavy loads. Knowing the safety protocols isn't just exam material — it's the difference between a routine job and a serious injury.
HV isolation: minimum safe 100 kΩ; proper isolation >1-10 MΩ. Test with megohmmeter before touching circuits. Safety regulations exist because the consequences of ignoring them are severe — injury, death, or legal liability. Know these requirements the way you know your own name.
PCV blockage: crankcase pressure rises, forcing oil past seals. Blue smoke (oil burning), leaks around gaskets, and seal failure result. Troubleshooting is a systematic process: identify symptoms, narrow down causes logically, and verify your diagnosis before replacing parts. This logical approach is what examiners want to see.
TPMS threshold: typically 25% below spec (for 32 psi spec, alarm at 24 psi). At 35 psi, no warning. On the job, a solid grasp of this concept means faster decisions, fewer errors, and work that passes inspection the first time.
Normal knock sensor signal with pinging: issue upstream—fuel octane, carbon deposits, timing advance, air temp/intake manifold. Troubleshooting is a systematic process: identify symptoms, narrow down causes logically, and verify your diagnosis before replacing parts. This logical approach is what examiners want to see.
ABS light without brake failure: sensor signal, solenoid, or wiring issue. Start with wheel speed sensor continuity/voltage. Troubleshooting is a systematic process: identify symptoms, narrow down causes logically, and verify your diagnosis before replacing parts. This logical approach is what examiners want to see.
Heavy equipment and vehicles are governed by federal and provincial regulations covering emissions, safety systems, weights and dimensions, and operator certification. Knowing these standards protects you legally and ensures the machines you service are roadworthy and safe.
Airbag disable in child seat: intentional if OEM-compatible. Some seats have sensors; verify compatibility and calibration. Understanding and applying code requirements correctly ensures your installations pass inspection and meet legal obligations in your jurisdiction.
Engine displacement, gear ratios, hydraulic pressure, electrical resistance, and fuel delivery rates all require calculation. These questions test your mechanical math: knowing which formula to apply, what units to use, and how to check your work.
CAN bus troubleshooting: verify physical layer (power/ground), check voltages (2.5V DC on each line with ~2.5V differential). Troubleshooting is a systematic process: identify symptoms, narrow down causes logically, and verify your diagnosis before replacing parts. This logical approach is what examiners want to see.
Solenoid resistance test: measure coil ohms. Open (no continuity) = no function. Shorted = excess current. Should match spec. Memorize this formula and practise substituting values — exam questions often give you three variables and ask you to solve for the fourth.
Open (no continuity) = no function
Motor-generator regenerative: outputs variable AC (switched/modulated by inverter). Voltage tracks brake demand. On the job, a solid grasp of this concept means faster decisions, fewer errors, and work that passes inspection the first time.
Data upload: 10 MB at 1 Mbps = 80 seconds. Plus verification and programming = ~100 seconds total. Battery essential. Memorize this formula and practise substituting values — exam questions often give you three variables and ask you to solve for the fourth.
Mbps = 80 seconds
DPF regen: high temp; abrupt shutdown can damage regen process or trap. Allow completion before shutdown. Troubleshooting is a systematic process: identify symptoms, narrow down causes logically, and verify your diagnosis before replacing parts. This logical approach is what examiners want to see.
Low solenoid resistance: may be borderline shorted. Current draw excessive; verify response time and vehicle performance. Knowing what each component does — not just what it is — helps you diagnose failures, specify replacements, and explain your work to inspectors and clients.
Vehicle systems use a wide range of specialty materials, fluids, and components that must meet OEM specifications. This section covers proper tool selection, component identification, and the material properties that determine service intervals and replacement requirements.
O2 sensor healthy: 0-1V cycling at >5 Hz. Slow cycling indicates slowed response from carbon buildup or aging. On the job, a solid grasp of this concept means faster decisions, fewer errors, and work that passes inspection the first time.
Transmission pressure: low indicates pump wear (worn vanes/gears), stuck regulator valve, or internal leak. On the job, a solid grasp of this concept means faster decisions, fewer errors, and work that passes inspection the first time.
Burnt transmission smell + dark fluid: friction material breakdown from slipping clutches. Heat damage; fluid and filter require change. Material selection directly affects performance, code compliance, and longevity. Using the wrong type can fail an inspection or create a hazard down the line.
Air suspension sag: check pressure in affected bag. Low (100 psi vs spec 180 psi) indicates leak or failed bag. Troubleshooting is a systematic process: identify symptoms, narrow down causes logically, and verify your diagnosis before replacing parts. This logical approach is what examiners want to see.
ESC off, traction on: likely one ABS sensor failed. ESC requires all 4 wheel speed sensors; traction control may use fewer. Troubleshooting is a systematic process: identify symptoms, narrow down causes logically, and verify your diagnosis before replacing parts. This logical approach is what examiners want to see.
Low compression: wet test differentiates. Oil in cylinder → piston ring leak (pressure increases to normal with oil). No change → valve leak. On the job, a solid grasp of this concept means faster decisions, fewer errors, and work that passes inspection the first time.
Coolant in exhaust: EGR cooler internal leak. Corrosion (typically aluminum fins in steel tubes) allows coolant into exhaust. Troubleshooting is a systematic process: identify symptoms, narrow down causes logically, and verify your diagnosis before replacing parts. This logical approach is what examiners want to see.
Single-gear slipping: band or clutch specific to that gear worn. Fluid condition normal rules out general deterioration. Troubleshooting is a systematic process: identify symptoms, narrow down causes logically, and verify your diagnosis before replacing parts. This logical approach is what examiners want to see.
Low steering pressure: pump cavitation/wear or relief stuck. Test relief directly; if stuck open, bypass pump output. Troubleshooting is a systematic process: identify symptoms, narrow down causes logically, and verify your diagnosis before replacing parts. This logical approach is what examiners want to see.
High starter draw + voltage drop: internal short or mechanical drag. Battery good if it sustains 11V; starter is at fault. Troubleshooting is a systematic process: identify symptoms, narrow down causes logically, and verify your diagnosis before replacing parts. This logical approach is what examiners want to see.
Diagnostic and repair procedures are systematic — skip a step and you'll miss the root cause. This section covers the proper approach to vehicle diagnosis, the sequence of mechanical repairs, and the testing methods that confirm a fix actually fixed the problem.
ADAS camera tolerance: ±0.3-0.5°. Misalignment causes lane detection error and false collision warnings. Recalibration required. Troubleshooting is a systematic process: identify symptoms, narrow down causes logically, and verify your diagnosis before replacing parts. This logical approach is what examiners want to see.
Radar sensor aim: typically 2-5° downward to detect bumpers and low objects. OEM targeting jig ensures accuracy. On the job, a solid grasp of this concept means faster decisions, fewer errors, and work that passes inspection the first time.
Injector balance: spec typically ±5% maximum. 12% variation causes cylinder lean/rich imbalance, rough running. Troubleshooting is a systematic process: identify symptoms, narrow down causes logically, and verify your diagnosis before replacing parts. This logical approach is what examiners want to see.
Low cat efficiency: catalyst substrate fouled/damaged. Cleaning rarely restores to >95%. Replacement typical. On the job, a solid grasp of this concept means faster decisions, fewer errors, and work that passes inspection the first time.
Timing belt cracks: replacement time. Delayed replacement risks engine damage. Inspect/replace per OEM interval (typically 60-100k). On the job, a solid grasp of this concept means faster decisions, fewer errors, and work that passes inspection the first time.
All 27 exam concepts from this guide — test your recall before you sit the exam.