EV, Hybrid and High-Voltage Checklist

DC-DC and 12V System Checklist

A low-voltage support sheet for EV/hybrid no-ready, weak 12V battery and DC-DC faults.

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Checklist Preview

  • DC-DC: test 12V battery before HV diagnosis
  • DC-DC: measure 12V resting voltage
  • DC-DC: measure DC-DC output in ready mode
  • DC-DC: turn on loads and observe regulation
  • DC-DC: check low-voltage grounds and fuses
  • DC-DC: inspect wake-up and interlock clues
  • DC-DC: scan for low-voltage and HV DTCs
  • DC-DC: confirm charge port status does not block ready mode
  • DC-DC: repair 12V faults before module replacement
  • DC-DC: record final ready-mode voltage

How To Use It

Use this checklist before replacing parts. Work from the top down, record the result of each step, and only move to repair decisions when the failed test is clear.

The downloadable PDF includes checkboxes, notes space, final verification and technician sign-off fields for workshop records.

Download Access

The page preview is public for SEO and learning. The PDF download route is available only to logged-in registered users through the existing Tutor login system.

Tools To Prepare

  • Insulated gloves
  • CAT-rated meter
  • Insulated tools
  • Thermal camera
  • Manufacturer safety data

Evidence To Record

  • State of charge
  • Isolation status
  • Connector temperature
  • Warning messages

Related Motomech Lessons and Tools

EV Charging Time Calculator EV Battery kWh / Ah / Voltage Calculator EV Charging Safety Video Library

SEO and Research Notes

This original Motomech worksheet is built from common workshop inspection logic: verify the complaint, inspect safety-critical systems first, measure before replacing parts, document the failed test, and finish with a repeatable road-test or service verification.