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Key Facts: IMI EV L4 Diagnostics Exam

610/0975/1

Ofqual qualification number for IMI Level 4 Diagnosis, Testing and Repair of Electric/Hybrid Vehicles and Components

tide.theimi.org.uk

Live HV scope

L4 addresses work on live high-voltage vehicle electrical components and systems (beyond L3 isolation-focused repair)

IMI 610/0975/1 purpose statement

L3 prerequisite

Requires IMI Level 3 EV system repair/replacement (or equivalent); ~6 months experience commonly recommended

IMI/provider entry guidance

~£600–£1,000+VAT

Typical approved-centre course package range (confirm locally)

Provider fee examples 2025–2026

IMI Level 4 EV/hybrid live HV diagnosis, testing and repair award (610/0975/1). Practical + oral + written/online knowledge; requires Level 3 first. Typical centre packages ~£600–£1,000 + VAT for 2–3 days. This free bank: 100 MCQs at 20% across five syllabus themes.

Sample IMI EV L4 Diagnostics Practice Questions

Try these sample questions to review concepts for the IMI EV L4 Diagnostics exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1On an EV traction battery pack, what is the main reason modules may be arranged in a series string?

A.To increase pack voltage to the level required by the inverter and motor system

B.To reduce pack voltage while increasing only the 12 V accessory capacity

C.To eliminate the need for a battery management system

D.To increase pack capacity (Ah) without raising pack voltage

Explanation: To increase pack voltage to the level required by the inverter and motor system. Series connection adds voltages so the pack can reach hundreds of volts needed by traction inverters.

2Connecting identical cells in parallel primarily increases which pack parameter?

A.Nominal voltage only, with no change to capacity

B.Available capacity (ampere-hours) and current capability at approximately the same voltage

C.Insulation resistance of the orange HV cables alone

D.The mandatory UNECE R100 cable colour requirement

Explanation: Available capacity (ampere-hours) and current capability at approximately the same voltage. Parallel connection keeps voltage roughly the same while ampere-hour capacity and current capability add.

3Ohm’s law relates which three electrical quantities?

A.Power, torque and vehicle mass only

B.Frequency, wavelength and temperature only

C.Voltage, current and resistance (V = I × R)

D.Insulation class, CAT rating and cable colour only

Explanation: Voltage, current and resistance (V = I × R). Ohm’s law is the foundational relationship used throughout LV and HV circuit diagnosis.

4Electrical power in a DC circuit is most directly calculated as:

A.P = V / I only, regardless of circuit type

B.P = I × R² with no voltage term ever used

C.P equals insulation resistance in megohms

D.P = V × I (power equals voltage times current)

Explanation: P = V × I (power equals voltage times current). Electrical power is the product of voltage and current in basic DC analysis used on vehicle systems.

5In many BEV traction systems, the inverter converts:

A.High-voltage DC from the traction battery into controlled AC (or pulsed waveforms) for the traction motor, and can convert regenerated energy back toward the pack

B.HV AC from the motor into unregulated 230 V domestic mains for workshop sockets

C.Only cabin USB power with no motor role

D.12 V battery current into HV pack voltage without any switching devices

Explanation: High-voltage DC from the traction battery into controlled AC (or pulsed waveforms) for the traction motor, and can convert regenerated energy back toward the pack. The traction inverter is the power-electronics bridge between the DC pack and the AC/brushless motor.

6A three-phase AC traction motor typically requires which form of supply from the power electronics?

A.A single unchanging DC voltage with no switching

B.Three phase-shifted AC waveforms (or equivalent controlled phases) to produce a rotating magnetic field

C.Only a 5 V logic rail with no power stage

D.Purely mechanical drive from the 12 V starter motor

Explanation: Three phase-shifted AC waveforms (or equivalent controlled phases) to produce a rotating magnetic field. Three-phase supplies create the rotating field that produces continuous torque in AC traction motors.

7What is the typical role of the DC-DC converter on an EV/HEV relative to the low-voltage system?

A.Step 12 V up to create the entire traction pack voltage without any HV battery

B.Replace the need for contactors in every architecture

C.Step high-voltage DC down to support and charge the low-voltage (often 12 V) electrical system

D.Provide only tyre pressure monitoring with no electrical conversion

Explanation: Step high-voltage DC down to support and charge the low-voltage (often 12 V) electrical system. The DC-DC converter fills the role an alternator plays on conventional vehicles for the LV system.

8When measuring insulation resistance on an HV component, which meter characteristic is most important?

A.Any cheap continuity buzzer is always sufficient for HV insulation proof

B.A standard low-voltage ohmmeter used only at a few volts of test potential

C.A clamp meter alone, because current measurement proves insulation integrity

D.A suitably rated insulation tester (megohmmeter) used at the manufacturer-specified test voltage and method

Explanation: A suitably rated insulation tester (megohmmeter) used at the manufacturer-specified test voltage and method. Insulation integrity is verified with a rated megohmmeter at the OEM-specified test voltage and method.

9CAT (measurement category) ratings on a multimeter primarily indicate:

A.The transient overvoltage environment the meter is designed to withstand at specified working voltages

B.The colour of the orange HV loom only

C.The maximum continuous DC current the meter leads can carry indefinitely

D.The vehicle’s MOT class exclusively

Explanation: The transient overvoltage environment the meter is designed to withstand at specified working voltages. CAT ratings tell you which transient environments a meter may safely measure in.

10In a series string of cells, if one cell develops a high-resistance open, what is the most likely pack-level effect?

A.Pack voltage always doubles automatically

B.Current through the series string is interrupted or severely limited, and the BMS will typically flag a severe fault

C.Insulation colour changes from orange to green

D.The 12 V battery becomes a traction battery

Explanation: Current through the series string is interrupted or severely limited, and the BMS will typically flag a severe fault. An open in a series string breaks the only current path through that string and triggers protection logic.

About the IMI EV L4 Diagnostics Exam

The IMI Level 4 Award in the Diagnosis, Testing and Repair of Electric/Hybrid Vehicles and Components (610/0975/1) is the advanced TechSafe pathway qualification for technicians who must diagnose, test and repair live high-voltage vehicle electrical components and systems. Built with industry, manufacturers, training providers and HSE input, it sits above Level 3 repair/replacement (which focuses on safe work around HV without the live-component repair scope of Level 4). Learners practise advanced diagnostics such as insulation resistance testing, live-data/actuation interpretation, potential equalisation, contactor weld testing and HV battery component work under controlled procedures.

Exam sponsor: Institute of the Motor Industry (IMI). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

Knowledge and skills to work on live high-voltage vehicle electrical components and associated systems: electrical principles for LV/HV; hazards and first aid for live HV work; risk reduction; HV systems/components; and safe diagnosis/testing/repair (including insulation resistance, live data/actuation, potential equalisation, contactor/BMS relay checks, and HV battery component work). Assessment: practical + oral + written/online knowledge. Prerequisite: IMI Level 3 EV system repair/replacement (or equivalent). Does not cover fixed commercial/domestic electrical installations including charging equipment and cables.

Time Limit

Not published on the public IMI L4 overview; confirm with your approved centre (centre courses commonly 2–3 days including practicals)

Passing Score

Not published as a fixed public percentage on the IMI overview; pass required on knowledge and practical (and oral where used) assessments — confirm with your centre

Exam / Certification Fees

Included in approved-centre course fees (typically about £600–£1,000 + VAT; e.g. EINTAC from ~£600, MIRA/NWSLC ~£849, Remit ~£995 + VAT, RWC ~£999 + VAT)

Exam sponsor website

Reported exam pass rate: not-published. IMI does not publish a public first-attempt pass rate for this award on the qualification overview pages. Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Official sources

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

20%

Electrical principles (LV and HV)

Pack topology, power/Ohm’s law, inverter/three-phase, DC-DC, measurement CAT/insulation and diagram literacy.

20%

Live HV hazards and first aid

Live-work scope, shock/arc, thermal/chemical risks, residual energy, silent movement and rescue priorities.

20%

Risk reduction for live HV work

Controls hierarchy, PPE/tools, LOTO, exclusion, prove-dead, permits and reinstatement.

20%

HV vehicle systems and components

BMS, contactors, MSD, OBC, interlocks, pre-charge, IMD/PDU and LV enable interactions.

20%

Diagnosis, testing and live repair

Insulation tests, live data/actuation, weld/equalisation tests, isolation faults, pack R&R and verification.

Preparing for the IMI EV L4 Diagnostics Exam

What You Need to Know

Passing score: Not published as a fixed public percentage on the IMI overview; pass required on knowledge and practical (and oral where used) assessments — confirm with your centre
Assessment: Knowledge and skills to work on live high-voltage vehicle electrical components and associated systems: electrical principles for LV/HV; hazards and first aid for live HV work; risk reduction; HV systems/components; and safe diagnosis/testing/repair (including insulation resistance, live data/actuation, potential equalisation, contactor/BMS relay checks, and HV battery component work). Assessment: practical + oral + written/online knowledge. Prerequisite: IMI Level 3 EV system repair/replacement (or equivalent). Does not cover fixed commercial/domestic electrical installations including charging equipment and cables.
Time limit: Not published on the public IMI L4 overview; confirm with your approved centre (centre courses commonly 2–3 days including practicals)
Exam / certification fees: Included in approved-centre course fees (typically about £600–£1,000 + VAT; e.g. EINTAC from ~£600, MIRA/NWSLC ~£849, Remit ~£995 + VAT, RWC ~£999 + VAT) Official sources

Using Our Practice Resources

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IMI EV L4 Diagnostics: Suggested Study Strategy

1Memorise the L4 boundary: live HV component diagnosis/testing/repair — not domestic EVSE installation wiring.

2Drill insulation resistance method, prove–test–prove, contactor weld symptoms and isolation-monitor DTCs — these dominate advanced knowledge items.

3Link live-data PIDs (pack voltage, contactor status, isolation, temperatures) to physical components before guessing parts.

4Practice talking through OEM pack removal/refit and post-repair verification, including 12 V enable and interlock checks.

Frequently Asked Questions

What is the IMI Level 4 EV/hybrid diagnostics award?

It is Ofqual qualification 610/0975/1 — IMI Level 4 Award in the Diagnosis, Testing and Repair of Electric/Hybrid Vehicles and Components. It equips technicians to work on live high-voltage vehicle electrical components and systems, and is an entry route toward IMI TechSafe™ recognition.

How does Level 4 differ from Level 3?

Level 3 focuses on safe repair/replacement around HV systems with appropriate isolation practice. Level 4 is the advanced award for diagnosis, testing and repair involving live HV vehicle electrical components and associated systems, with practical demonstration of those skills.

What are the entry requirements?

You must already hold the IMI Level 3 Award in Electric/Hybrid Vehicle System Repair and Replacement (or equivalent). Providers typically recommend about six months related experience, or completion of a Learner Eligibility form with evidence of related experience.

How much does the course cost?

Fees are set by approved centres. Published 2025–2026 examples commonly fall around £600–£1,000 + VAT for a multi-day package (for example EINTAC from about £600, MIRA/NWSLC about £849, Remit about £995 + VAT, RWC about £999 + VAT). Always confirm what is included.