ASE A6 study guide
ASE A6 · Work through your exam, one topic at a time.
ASE A6, Electrical/Electronic Systems, is one of the automobile and light truck certification tests in the ASE certification series. It is intended for working service professionals - dealership and independent shop technicians, fleet technicians, and advanced students - who diagnose and repair vehicle electrical and electronic faults rather than only replacing parts. The ASE A6 study guide has 7 sections and about 2,571 words.
01General Electrical/Electronic System Diagnosis
Nearly every A6 failure traces back to skipped fundamentals, so start with Ohm's law (E = I x R), the power equation, and the behavior of series and parallel circuits. Current is identical everywhere in a series circuit, voltage divides across the series resistances, and each parallel branch sees full source voltage.
404 words, about 2 min02Battery Diagnosis and Service
The battery is a chemical device, so its state of charge must be read on its own terms. Open-circuit voltage approximates state of charge on a rested, surface-charge-free battery: roughly 12.6 volts (about 2.1 volts per cell) is fully charged, and each few tenths of a volt of drop represents a substantial loss of charge.
359 words, about 2 min03Starting System Diagnosis and Repair
Separate the starting system into two circuits: the control circuit (ignition switch, clutch or transmission range switch, anti-theft, relay, and solenoid winding) and the high-current circuit (battery, cables, solenoid contacts, starter motor). A no-crank, a slow crank, and a crank-but-no-start are three different complaints, and mixing them up wastes time.
331 words, about 2 min04Charging System Diagnosis and Repair
The charging system is an alternator, a rectifier bridge, a voltage regulator, and the wiring that connects them - plus, on modern vehicles, a battery current sensor and a PCM that manages charging strategy. The alternator produces AC in the stator, the rectifier converts it to DC, and the regulator controls field current to hold a target voltage.
358 words, about 2 min05Lighting System Diagnosis and Repair
Lighting looks simple and is not: lamps are wired in parallel, frequently switched on the ground side, and increasingly driven by pulse-width modulation, relays, or body control modules. Understand the circuit before probing.
369 words, about 2 min06Instrument Cluster and Driver Information System Diagnosis and Repair
Clusters have evolved from individual thermal and magnetic gauges driven by dedicated senders to stepper-motor movements fed data over a bus. The diagnostic question is always the same: is the fault in the sender, the wiring, or the cluster/module?
385 words, about 2 min07Body Electrical System Diagnosis and Repair
Body electrical covers everything the driver touches: windows, locks, mirrors, seats, wipers, horns, HVAC blowers, keyless entry, and the body control module that ties them together. The recurring theme is that many of these systems are module-controlled with inputs from switches and outputs to motors, so a scan tool showing switch status and output commands saves far more time than probing.
365 words, about 2 min