ASE XEV1 case studies
ASE XEV1 · Put your knowledge to work in context.
The ASE xEV credential family is aimed at technicians who work around high-voltage vehicle systems - hybrid, plug-in hybrid, and battery-electric cars and light trucks - and who need to demonstrate that they can do that work without becoming part of the circuit. ASE lists an "xEV Safety Testing" program in the Certification Tests section of its website, which is the authoritative place to confirm what the program currently contains. The ASE XEV1 case studies are 5 cases and about 3,768 words.
1Slower-Than-Spec DC Bus Discharge After Service Disconnect
A 2019 battery-electric sedan (350 V nominal, 96-series Li-ion pack) is in for high-voltage cable replacement at the charge-port end. Following the OEM procedure, the technician powers down, removes the HV service disconnect under the rear seat, waits the specified 5 minutes, then measures DC bus voltage at the inverter terminals with a CAT III 1000 V DMM whose calibration sticker is current.
819 words, about 4 min2Glove Class and Test-Date Conflict Before a Pack Drop
A technician is assigned to drop the HV battery from a 400 V nominal passenger van reading 92 % state of charge. The shop's glove log shows one pair of Class 0 gloves (1000 V AC / 1500 V DC), last dielectric test 7 months ago, both leather protectors present; and one pair of Class 00 gloves (500 V AC / 750 V DC), last dielectric test 2 months ago, missing one leather protector.
779 words, about 4 min3One Weak Cell Group at Eight Years and a Salvage Module
A 2017 plug-in hybrid with 141,000 miles arrives with EV range down from 22 to 9 miles and a stored hybrid-battery performance code. The 96-series pack is at 61 % SOC.
748 words, about 4 min4Low Insulation Resistance at the Traction Motor
A 2021 AWD electric crossover sets an inverter performance code and derates after about 10 minutes of highway driving. Coolant level is slightly low and there is dried coolant residue at the motor three-phase terminal cover.
701 words, about 4 min5Isolation Fault That Only Appears When It Rains
A 2020 electric hatchback comes in with an intermittent HV isolation warning lamp. The owner reports it appears after rain or a car wash and usually clears by the next day.
721 words, about 4 min