NZ Certificate in Light Automotive Engineering (Level 5) Theory Assessment

Under NZQA 3451 graduate outcomes, what is a Level 5 technician expected to do regarding team responsibilities?

• AOversee team duties and ensure compliance with legislative and company safety requirements
• BPerform only basic servicing tasks without supervisory involvement
• CDelegate all safety compliance solely to external auditors
• DFocus exclusively on sales targets without monitoring workshop hazards

A Level 5 technician reviews a junior's HV isolation procedure on a BEV. The apprentice skipped voltage verification. What is the correct leadership response?

• AStop work immediately, complete full isolation and zero-voltage verification, then retrai…
• BAllow completion if gloves were worn
• CContinue because the 12 V battery was disconnected
• DDocument success and move to the next job without correction

When introducing ADAS calibration equipment to a NZ workshop, what must a Level 5 technician ensure under HSWA principles?

• ARisk assessment, operator training, documented safe-work procedures, and maintained equip…
• BImmediate use without training to meet customer deadlines
• CRemoval of all wheel chocks to speed alignment rack setup
• DDisabling SRS systems permanently to avoid fault codes

A workshop KPI shows rising comebacks on complex electrical repairs. As technical leader, what is the best first action?

• AReview diagnostic evidence, repair documentation, and technician workflow to identify sys…
• BBlame customers for misusing vehicles
• CReduce diagnostic time targets to increase throughput
• DStop using scan tools to avoid false codes

Which record best demonstrates HSWA compliance when a Level 5 technician oversees hybrid battery removal?

• ACompleted job card with isolation steps, voltage verification readings, PPE used, and tec…
• BVerbal confirmation only with no written evidence
• CCustomer signature on a sales invoice alone
• DSocial media post showing the removed pack

A technician reports recurring near-misses with unsecured vehicles on hoists. What is the Level 5 monitoring duty?

• AInvestigate root cause, reinforce hoist positioning and lock procedures, and escalate unr…
• BIgnore near-misses because no injury occurred
• CAllow one-wheel support if the job is quick
• DDisable hoist safety locks to speed lifting

When mentoring apprentices on complex CAN bus diagnosis, what approach aligns with Level 5 outcomes?

• AGuide systematic testing, require evidence before parts replacement, and review oscillosc…
• BEncourage guess-replace until the fault clears
• CProhibit use of wiring diagrams to build independence
• DAssign only tyre rotations until Level 5 is completed

WorkSafe inspects after a solvent fire in the spray booth area. What leadership documentation is most critical?

• ASDS for all chemicals, booth maintenance records, hot-work permits, and staff training lo…
• BOnly the vehicle WoF certificate
• CCustomer complaint emails unrelated to chemicals
• DTyre pressure records for the courtesy car

A Level 5 technician must allocate a complex intermittent electrical job. Best practice is to:

• AAssign to a competent technician with appropriate tools, time allowance, and diagnostic p…
• BRush the job between oil changes without scope discussion
• CRefuse all intermittent faults as undiagnosable
• DReplace the ECM first to save diagnostic time

Under the Health and Safety at Work Act 2015, who holds the primary duty to ensure workplace health and safety?

• AThe PCBU (person conducting a business or undertaking)
• BOnly the most junior apprentice on site
• CCustomers waiting in reception
• DVehicle manufacturers exclusively

A GDI engine shows misfire on cylinder 3 only with carbon fouled intake valve. Live data: STFT +8%, LTFT +6% on bank 1. What is the most likely cause?

• ALocalized intake valve carbon affecting cylinder 3 mixture delivery
• BGlobal vacuum leak affecting all cylinders equally
• CFailed rear oxygen sensor on bank 2 only
• DIncorrect tyre pressures causing single-cylinder misfire

DPF differential pressure reads high at steady cruise with repeated P2002. Regeneration attempts fail. What is the best next diagnostic step?

• AInspect for blocked DPF, failed differential pressure sensor, or exhaust leaks affecting…
• BDelete the DPF electronically without hardware inspection
• CReplace the alternator
• DIncrease engine oil level above maximum

Both banks show LTFT near +25% at idle, normalising toward 0% at 2500 rpm. MAF reads low at idle. What is indicated?

• AVacuum leak or unmetered air entering downstream of the MAF sensor
• BRich condition from leaking injectors
• COver-advanced ignition timing only
• DLow coolant level exclusively

A turbocharged petrol engine has P0299 under boost. Smoke test shows no intake leaks. What should be checked next?

• ABoost leak downstream of MAF, wastegate/actuator function, and charge air cooler integrity
• BRear wiper motor current draw
• CPower steering fluid colour only
• DSpare wheel age

Pre-cat O₂ sensor switches rapidly; post-cat sensor shows flat line near 0.45 V. What is the conclusion?

• ACatalyst efficiency is degraded — post-cat sensor should show damped switching if catalys…
• BBoth sensors have failed open simultaneously
• CEngine is running in open loop permanently
• DFuel tank is completely full

An EGR valve stuck open causes which driveability pattern on a petrol engine?

• ARough idle, possible stall at idle, and hesitation off idle
• BOnly high-speed knock under full load
• CImproved cold-start performance exclusively
• DIncreased turbo boost pressure

OBD readiness monitor shows Catalyst monitor "Not Ready" after battery disconnect. What must occur before an emissions inspection?

• AComplete drive cycle per manufacturer service information to set readiness monitors
• BClear codes and ignore readiness status
• CDisconnect O₂ sensors to force readiness
• DRemove the fuel cap permanently

Compression test: Cylinders 1–3 at 1250 kPa, cylinder 4 at 890 kPa. Wet test on cyl 4 rises to 900 kPa. Diagnosis?

• AMechanical fault in cylinder 4 — rings or valve sealing issue, not a gauge error
• BNormal variation within specification
• CElectrical misfire only with no mechanical fault
• DContaminated fuel affecting one plug only

A direct-injection engine requires 5W-30 API SN plus oil. A technician uses 20W-50 mineral oil. Risk to the turbocharger?

• AInadequate cold-flow and thermal protection causing bearing oil starvation and accelerate…
• BImproved turbo response at all temperatures
• CNo effect because oil viscosity is irrelevant to turbos
• DAutomatic DPF regeneration improvement

NOx sensor downstream of SCR reads persistently high with DEF level confirmed full. What is suspected?

• ASCR catalyst degradation, DEF quality issue, or injector crystallisation affecting reduct…
• BLow tyre tread on front axle only
• CIncorrect wiper blade length
• DRear demister grid resistance within spec

Fuel pressure spec: 4000 kPa at idle. Measured 2800 kPa with P0087 stored. Engine hesitates under load. Cause?

• AFuel supply restriction — pump wear, clogged filter, or restricted line
• BExcessive fuel pressure from stuck regulator
• CPerfect fuel system operation
• DIgnition coil primary circuit open on all cylinders

An engine coolant temperature sensor reads −40 °C at warm idle. Effect on fuel and emissions systems?

• AECM enriches mixture and may prevent O₂ closed loop, increasing emissions and fuel consum…
• BLean operation and immediate catalyst efficiency improvement
• CNo effect on engine management strategy
• DAutomatic increase in turbo boost limit

Before removing a high-voltage service plug on a hybrid vehicle, what sequence is mandatory?

• AFollow OEM shutdown: ignition off, wait prescribed time, remove key/fob, disconnect 12 V…
• BRemove orange cables first without isolation
• CSpray contact cleaner on live HV terminals
• DUse a standard 12 V test lamp to discharge the traction battery

A BEV shows "HV system fault" with isolation resistance below 500 Ω/V. First safe diagnostic action?

• ADo not touch HV components; follow OEM insulation fault procedure with rated PPE and insu…
• BProbe battery terminals with bare hands wearing cloth gloves
• CDrive the vehicle at maximum speed to clear the fault
• DBypass the interlock circuit permanently

Regenerative braking contribution drops to zero but friction brakes work. Live data shows fault in inverter coolant temperature. Likely cause?

• AInverter thermal derating limiting regen to protect power electronics
• BFlat 12 V auxiliary battery with no HV impact
• CWorn wiper blades reducing regen torque
• DLow engine oil on a pure BEV

Onboard charger reports input AC present but no HV battery charging. DC side fuse tests open. Next step?

• AInspect OBC internal fault, HV cable integrity, and battery management charge permission…
• BReplace all four tyres
• CAdjust steering wheel rake only
• DRemove the catalytic converter

A hybrid vehicle in READY mode produces 230 V AC from the inverter for external equipment (if equipped). Technician safety requirement?

• ATreat as lethal AC source; follow OEM lockout and load limits; never work on output while…
• BAssume low risk because it is a hybrid
• CUse household extension leads without rating check
• DDisable grounding to improve output

Traction battery state of health reads 72% with cell imbalance >150 mV between blocks. Customer reports reduced EV range. Action?

• AFollow OEM battery health procedure — balance attempt, module test, or replacement per ma…
• BIgnore imbalance because vehicle still drives
• CAdd engine oil to battery cooling circuit
• DFit larger 12 V battery to increase EV range

Orange HV cable sheath is nicked exposing shield braid only, not inner conductor. Correct repair?

• AReplace cable section or entire HV lead per OEM repair kit — tape-only repair is not acce…
• BWrap with general cloth tape and return to service
• CPaint over damage with underbody sealant only
• DConvert to 12 V cable for cost saving

A PHEV will not enter EV mode. Fuel level is full. Codes show EV system unavailable. HV battery SOC shows 95%. Suspect?

• ATemperature, system fault, or mode inhibit — not simply low SOC
• BExcess fuel preventing EV mode always
• CRear washer fluid low exclusively
• DIncorrect radio station preset

Calculating power: a BEV motor draws 200 A at 360 V during acceleration. Approximate electrical power?

• A72 kW
• B560 W
• C7200 kW
• D1.8 kW

After HV battery replacement on a hybrid, what is typically required before road test?

• AOEM relearn or calibration procedure, clear codes, verify no HV interlock faults, and con…
• BImmediate full-throttle test without scan tool checks
• CRemoval of all SRS components
• DPermanent disconnection of 12 V battery for one week

A hybrid ABS actuator runs during low-speed braking even on gentle stops. Normal?

• AYes — hybrids often blend regenerative and hydraulic braking through the ABS/actuator unit
• BNo — ABS must never activate below 10 km/h under any condition
• CIndicates brake fluid is petrol contaminated only
• DProves power steering pump failure

DC fast charge stops at 45% SOC on a BEV in hot ambient conditions. No codes stored. Explanation?

• AThermal management reducing charge rate or stopping to protect battery — normal protectiv…
• BPermanent battery failure requiring immediate scrap
• C12 V alternator overcharging
• DClutch slip in CVT transmission

HV battery coolant specific gravity/conductivity is out of spec. Risk if ignored?

• AReduced cooling efficiency, corrosion, and possible isolation fault codes
• BImproved battery range automatically
• CHigher engine compression ratio
• DIncreased power steering assist

A technician measures 380 V DC across HV bus after isolation procedure. Spec requires below 30 V. Action?

• ADo not proceed — repeat wait time, follow residual voltage discharge procedure, re-verify…
• BProceed because 380 V is normal for touch work
• CUse water to cool the battery terminals
• DShort HV terminals with a screwdriver to discharge

With ignition off, resistance between DLC pins 6 (CAN H) and 14 (CAN L) reads 120 Ω. What does this indicate?

• AOne of two 120 Ω terminators is missing or disconnected — correct total is near 60 Ω
• BPerfect termination with both 120 Ω resistors in parallel
• CComplete short between CAN H and CAN L
• DOpen circuit on both CAN lines with no modules connected

U0100 Lost Communication with ECM plus U0101 TCM and U0121 ABS on a single vehicle. Most likely network layer fault?

• ACommon power, ground, or CAN backbone fault affecting multiple modules simultaneously
• BThree independent module failures with no related cause
• CLow engine oil exclusively
• DIncorrect windscreen wiper blade fitment

During active CAN communication on a scope, CAN H stays fixed at approximately 2.5 V and CAN L stays fixed at approximately 2.5 V with no differential switching. Diagnosis?

• AFault — healthy HS-CAN alternates dominant (~3.5 V H / ~1.5 V L) and recessive (~2.5 V bo…
• BNormal recessive idle only — no further checks needed
• CProof of fully functional network during data transfer
• DEvidence that terminators are doubled

A gateway module on a modern vehicle performs which function?

• ARoutes messages between separate CAN/LIN/FlexRay networks and may filter diagnostic access
• BIncreases engine compression ratio
• CReplaces the need for all terminators
• DStores tyre rotation history only

After windscreen replacement, lane departure warning inoperative. No DTCs. Required action?

• APerform camera aiming/calibration per OEM procedure including wheel alignment and ride he…
• BReplace engine ECU
• CIgnore because ADAS is optional
• DDisconnect CAN bus terminators permanently

LIN bus fault affects electric windows and mirrors only. Powertrain modules normal. Explanation?

• ALIN is a separate lower-speed body network — faults are often localised to body subnet ma…
• BLIN and powertrain CAN are always the same physical pair
• CEngine oil viscosity controls LIN baud rate
• DBrake pad thickness sets LIN termination

Oscilloscope on CAN H during communication shows clean square wave. CAN L is flat at 0 V. Fault?

• ACAN L open or shorted to ground — differential pair requires both signals
• BPerfect normal operation
• CExcess termination resistance only
• DLow fuel level

Multiple modules report "incorrect checksum" after aftermarket alarm installation. Cause?

• AAlarm spliced into CAN or LIN lines causing message corruption or improper bus loading
• BFactory audio antenna disconnected only
• CCorrect engine coolant mixture
• DNew wiper blades

Diagnostic tool connects at 500 kbaud on HS-CAN but cannot access body modules. Gateway likely requires?

• AOEM gateway routing session or tool with manufacturer body network authorization
• BPhysical removal of engine air filter
• CEngine oil change to 0W-16 only
• DTyre rotation pattern change

CAN bus length increases after a body repair extension splice. Maximum unrepeated segment length exceeded. Symptom?

• AIntermittent communication errors, elevated error counters, and module dropouts at high b…
• BImproved fuel economy only
• CHigher engine compression
• DPermanent increase in tyre pressure

U0415 Invalid Data Received from ABS Module appears with ESP light on. ECM data normal. Diagnosis priority?

• AVerify ABS module power, ground, CAN integrity, and internal ABS fault codes before blami…
• BReplace all spark plugs
• CAdjust headlamp aim only
• DChange cabin air filter