Summary
DIYguru hosted a Masterclass on “Decoding the EV Nervous System”, presented by Mr. Rahul Kumar Vidhawad (EV Specialist, DIYguru) and moderated by Ashraf, Growth & Strategy Lead at DIYguru. The session explored how the powertrain and battery systems act as the “nervous system” of an electric vehicle, along with a structured troubleshooting approach for common EV failures. Participants also gained practical knowledge of Power Distribution Units (PDU), Motor Controllers, ADAS, charging systems, pyro fuses, and safety protocols while working with high-voltage systems.
Introduction & Session Kick-off
Ashraf (DIYguru) opened the session by welcoming participants and introducing the guest speaker, Mr. Rahul Kumar Vidhawad. With over a decade of experience in the EV domain and having trained 1,000+ learners, Rahul brought industry-level insights to the audience.
The session began by highlighting:
- The rapid rise of EV adoption in India
- The importance of structured diagnostics and troubleshooting in EV maintenance
- DIYguru’s commitment to bridging the gap between education and EV industry skills
Rahul emphasized that EVs are the future of mobility and set the session’s objective: learning how to restart or troubleshoot a stalled EV using systematic methods.
The “Nervous System” of EVs
Rahul explained that an EV’s nervous system consists of two core elements: Powertrain and Battery System. Both are interlinked, ensuring smooth functioning of the vehicle.
Powertrain components include:
- Power Distribution Unit (PDU)
- Motor Controller Unit (MCU)
- DC-to-DC Converter
- Vehicle Control Unit (VCU)
- Inverter Unit
- OBD tools
Battery system components include:
- Battery Pack
- Battery Management System (BMS)
- Battery Thermal Management System (BTMS)
- High-Voltage Cables
- Onboard Charger
- Fuses & Safety Switches
By breaking down the nervous system in this way, Rahul helped learners understand how each subsystem communicates and why diagnosing problems in sequence is critical.
Troubleshooting a Stalled EV
A practical example was shared: An EV with 50% State of Charge (SOC) refuses to start. Rahul walked participants through the step-by-step troubleshooting process.
- Visual Inspection – Check for loose connections, warning signs, or chimes
- Ignition System Check – Confirm if the instrument cluster powers up
- Narrowing Down – If ignition works but the vehicle stalls, focus on the powertrain and PDU instead of the battery
This structured approach avoids random guesswork and ensures engineers identify the root cause systematically.
Diagnosing Powertrain Issues
If the ignition is fine but the vehicle won’t run, the Power Distribution Unit (PDU) is the next checkpoint. The ignition signal flows through the MCU to activate the motor and throttle.
Possible issues to investigate:
- High Voltage Cables – Loose or damaged connections
- Battery Disconnect Unit (BDU) – May be faulty due to water, fire, or impact
- Fuses – Vehicles like Mahindra may have one, while Tata vehicles may use two
- Kill Switches – Safety switches must be properly disengaged
Rahul explained that each of these must be inspected in sequence before moving to the next stage. This systematic approach prevents unnecessary component replacements and improves diagnostic efficiency.
Practical Demonstration of the PDU Unit
Rahul conducted a live demonstration using the Mahindra Earto PDU from the DIYguru Lab. Learners were shown the key elements inside the PDU:
- Motor Controller Unit (MCU)
- Battery terminals (B+ and B–)
- Contactor (to disconnect battery when vehicle is off)
- Relay board for auxiliary systems
- OBD loom connections
- DC-to-DC converter
This hands-on demonstration helped participants clearly visualize how the PDU integrates different systems and distributes power. It reinforced the practical side of EV diagnostics beyond theory.
EV Charging Systems & DCDC Converters
Rahul compared GBT fast charging systems (15 kW) with the globally adopted CCS2 connectors, explaining the importance of standardized charging.
He also clarified the role of the DCDC converter, which:
- Steps down high-voltage battery power to run auxiliary systems
- Provides 12V supply for wipers, horns, and infotainment
- Ensures efficient energy management between the traction system and smaller loads
This section highlighted the interdependence between charging systems and auxiliary power systems in EVs.
Advanced Topics Covered
The session also explored advanced areas of EV systems:
- Motor Types: Induction, PMS, IPM, and BLDC motors (radial & axial flux)
- High-Voltage Safety: Always disconnect the battery, wait 5–10 mins for residual charge, and use insulated gloves, shoes, and mats
- ADAS Systems: Explained how sensors, radar, and controllers work together for features like auto-braking and lane assistance
- Pyro Fuse Functionality: Disconnects the battery during overheating or collision to protect both the EV and passengers
Rahul emphasized that engineers must never take shortcuts when working with high-voltage systems, as voltages can range between 300–800V.
Careers & Training Opportunities
Rahul concluded by connecting the session’s technical knowledge to career opportunities in the EV sector. He highlighted DIYguru’s specialized certification programs in:
- EV Powertrain & Battery Systems
- Embedded Systems & EV Electronics
- Battery Management Systems (BMS)
He also shared that webinar participants would receive exclusive discounts for enrolling in courses. This aligns with DIYguru’s vision of enabling learners to enter high-demand EV industry roles in testing, R&D, and service.
Certificate Support
During the Q&A, a participant raised a concern about workshop certificates. Ashraf assured that all pending certificates would be delivered the next working day. This reinforced DIYguru’s commitment to ensuring not just quality training, but also support and recognition for every learner.
Why Attend DIYguru Webinars?
DIYguru’s webinars offer a blend of industry insights, live demonstrations, and structured learning. They are valuable for:
- Engineering students exploring EV technologies
- Professionals looking to upskill in EV diagnostics and powertrain systems
- Job-seekers preparing for EV career opportunities
By combining real-world problem-solving with safety practices, DIYguru ensures that learners are job-ready for India’s growing EV sector.
About DIYguru
DIYguru is India’s leading EV upskilling and training platform, having empowered over 100,000 learners through partnerships with universities, corporates, and government projects.
Its flagship programs in EV Design, Battery Pack Engineering, Powertrain Development, and Embedded Systems equip learners with skills that meet industry demand and contribute to the global transition toward sustainable mobility.
