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ASE A6 Cheat Sheet

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General Electrical/Electronic Diagnosis

  • 26% of exam
  • Ohm's Law Voltage Drop DMM Testing CAN Bus Circuit Protection

Battery & Starting

  • 18% of exam
  • OCV Readings Load Test AGM vs Flooded Starter Draw Voltage Drop

Charging System

  • 10% of exam
  • Alternator Output AC Ripple Voltage Regulation Smart Charging

Lighting Systems

  • 12% of exam
  • HID vs LED Hyperflash Fix Adaptive Headlights DRL Method

Body Electrical Systems

  • 34% of exam
  • HMI Cluster Comfort Accessories SRS Safety Security Systems Heated Accessories

Quick Facts

  • Exam ASE A6
  • Credential Electrical/Electronic Systems
  • Questions 60 total / 50 scored
  • Time 90 minutes
  • Pass Scaled score, ~70% guide
  • Format Computer-based, Prometric
  • Level Master tech required
  • Blueprint 2026 ASE Study Guide

Ohm's Law Triangle GE

  • V over I times R
  • V = I x R I = V / R R = V / I

Fuse vs Fusible Link GE

Fuse

  • One-time sacrificial device
  • Opens at fixed rating

Fusible Link

  • Smaller-gauge wire section
  • Must match original spec
  • Device vs wire

Test Tool Picker GE

  • Need volts, ohms, amps → DMM
  • Need signal over time → Oscilloscope
  • Need current, no break → Amp clamp
  • Circuit stays energized, loaded → Voltage drop test
  • Circuit must be de-energized → Resistance or continuity test
  • Need scan data or DTCs → Scan tool

Electrical Fundamentals GE

  • Ohm's Law V = I x R
  • Watt's Law P = V x I
  • Series circuit One current path, voltage divides
  • Parallel circuit Multiple paths, equal voltage each
  • Open circuit Broken path, no current flows
  • Short circuit Unwanted low-resistance path forms
  • Ground Circuit's return path to battery

Voltage Drop Thresholds GE

  • 0.1V connector, 0.2V starter cable
  • Connector: 0.1V max Starter cable: 0.2V max Ground point: 0.1V max

Series vs Parallel Circuits GE

Series

  • One current path
  • Voltage divides across loads

Parallel

  • Multiple current paths
  • Same voltage each branch
  • Current same vs voltage same

DMM & Test Equipment GE

  • DMM Measures volts, ohms, amps
  • Voltage drop test Circuit energized and under load
  • Max drop per connector 0.1V per connection point
  • Starter cable max drop 0.2V on positive cable
  • Parasitic draw normal 20-50 mA key-off
  • Ohmmeter rule Test only de-energized circuits
  • Oscilloscope use View signal changes over time
  • Amp clamp Reads current without breaking circuit

CAN Bus Voltage States GE

  • Recessive 2.5V both, dominant splits apart
  • Recessive: both near 2.5V Dominant: CAN-H up, CAN-L down

CAN Bus vs LIN Bus GE

CAN

  • Two wires, high speed
  • Powertrain, safety-critical systems

LIN

  • Single wire, low speed
  • Non-critical body functions
  • Critical vs convenience

Networks & Circuit Protection GE

  • CAN bus Two-wire, high-speed module network
  • CAN idle voltage Both lines near 2.5V
  • CAN bus resistance 60 ohms, two terminators parallel
  • LIN bus Single-wire, low-speed body network
  • Gateway module Translates between bus protocols
  • Bus-off condition Module disabled its own transmitter
  • Fuse One-time sacrificial overcurrent device
  • Circuit breaker Resettable overcurrent protection device
  • Fusible link Replace with identical link only
  • Wiring diagram dot Solid dot means spliced connection

Voltage Drop vs Resistance Test GE

Voltage Drop

  • Circuit energized
  • Under normal load current

Resistance Test

  • Circuit de-energized
  • Meter supplies test current
  • Powered vs unpowered

Battery State of Charge BA

  • 12.6 full, 12.4 75%, 12.2 half
  • 12.6V: 100% 12.4V: 75% 12.2V: 50% 12.0V: 25% or less

AGM vs Flooded Battery BA

AGM

  • Absorbed glass mat
  • Sealed, deep-cycle tolerant

Flooded

  • Free liquid electrolyte
  • Needs maintenance and venting
  • Stop-start vs standard

Starting Fault Picker BA

  • Rapid solenoid clicking → Load test the battery
  • Slow or no crank → Voltage drop test cables
  • Won't crank in gear → Check neutral safety switch
  • High starter current draw → Suspect dragging starter
  • Battery good, still no start → Test starter circuit drop

Battery Types & Testing BA

  • Full charge OCV About 12.6 volts resting
  • 50% charge OCV About 12.2 volts resting
  • AGM battery Sealed, absorbed glass mat electrolyte
  • EFB battery Enhanced flooded, entry-level stop-start
  • Load test spec Half CCA, 15 seconds, 9.6V+
  • Conductance test AC signal measures internal resistance
  • Battery state of charge Each 0.2V step is 25%

Load Test vs Conductance Test BA

Load Test

  • Applies heavy DC load
  • Reads voltage sag directly

Conductance Test

  • Sends small AC signal
  • Estimates internal resistance value
  • Direct load vs signal

Starting System Diagnosis BA

  • Starter draw, 4-cyl Roughly 50-100 amps
  • Starter draw, 8-cyl Roughly 100-200 amps
  • Starter cable voltage drop Max 0.2V during cranking
  • Rapid solenoid click Weak battery or high resistance
  • Neutral safety switch Blocks crank outside Park/Neutral
  • Slow crank cause Battery, cables, or starter drag
  • No crank cause Open circuit or dead battery

Charging Fault Picker CH

  • Voltage below 13.5V → Suspect undercharge
  • Voltage above 14.5-15V → Suspect overcharge
  • Ripple above 500 mV → Suspect failed diodes
  • Lamp on, engine running → Check belt, circuit, alternator
  • Output weak under load → Test alternator output

Charging System Diagnosis CH

  • Normal charging voltage 13.5 to 14.5 volts
  • Undercharging sign Below 13.5V, weak output
  • Overcharging sign Above 14.5-15V, bad regulator
  • AC ripple normal Under 100-200 mV
  • AC ripple failure Above 500 mV, bad diodes
  • Charge lamp stays lit Belt, circuit, or alternator fault
  • Smart charging PCM commands variable alternator output
  • Output test spec 90% rating near 2000 RPM

HID vs LED Headlights LI

HID

  • Gas discharge, needs ballast
  • Fades or shifts blue

LED

  • Solid-state diode source
  • Draws far less current
  • Ballast vs diode

Lighting Systems & Components LI

  • HID dimming/blue shift Aging or failing HID bulb
  • LED hyperflash cause Flasher reads low LED current
  • Hyperflash fix Load resistors or LED flasher
  • DRL method Reduced voltage or PWM headlights
  • Adaptive headlight inputs Steering angle plus vehicle speed
  • Multiple lights fail together Suspect shared fuse or ground
  • Trailer brake control Dedicated relays and control module

Body Electrical Fault Picker BO

  • Fault follows one component → Isolate that component first
  • Fault spans several circuits → Suspect shared fuse or ground
  • SRS lamp lit → Scan for stored codes
  • Camera shows no image → Check power, ground, signal
  • Immobilizer blocks starting → Check transponder code match

HMI & Instrument Cluster BO

  • Multiplexed cluster data Arrives over CAN or LIN
  • Stepper motor gauge Digital, precise needle positioning
  • Air-core gauge Older analog crossed-coil design
  • Fuel gauge false reading Sender or ground circuit fault
  • HMI systems Cluster, info display, infotainment

Comfort & Convenience Accessories BO

  • Power window slow both ways Shared power or ground fault
  • Memory seat function Position sensors report to module
  • One door lock fails Isolate to that door's actuator
  • Blower runs high only Resistor block or PWM module
  • Heated seat no warmth Check element continuity, thermostat
  • Defroster grid break Voltage drop test finds it

Security, SRS & Safety Systems BO

  • Transponder immobilizer Chip code must match module
  • Weak keyless entry range Fob battery is weakening
  • Anti-theft blocks crank Module failed to disarm
  • SRS lamp stays on Fault stored, airbags disabled
  • Clock spring Coiled cable feeds steering wheel
  • Before SRS service Disconnect battery, wait per spec
  • Wiper won't park Check park switch circuit first
  • Backup camera no image Check power, ground, signal path

Common Traps

Voltage Drop ≠ Resistance Test

  • Drop test: circuit energized ≠ Resistance test: circuit de-energized

Fuse ≠ Fusible Link

  • Fuse: one-time sacrificial device ≠ Fusible link: harness wire section

AGM ≠ Standard Flooded Battery

  • AGM: sealed, deep-cycle ready ≠ Flooded: free liquid, maintainable

CAN Bus ≠ LIN Bus

  • CAN: two wires, fast ≠ LIN: one wire, slow

Load Test ≠ Conductance Test

  • Load test: heavy DC draw ≠ Conductance test: small AC signal

HID Fade ≠ LED Hyperflash

  • HID: bulb ages, dims and blues ≠ LED: flasher misreads low current

Last Minute

  • 1. Domain weights: 26-18-10-12-34%
  • 2. 60 total, 50 scored questions
  • 3. 90 minutes, computer-based test
  • 4. Passing score is scaled, not fixed
  • 5. Ohm's Law: V = I x R
  • 6. Voltage drop needs energized circuit
  • 7. Resistance test needs de-energized circuit
  • 8. Max connector drop: 0.1 volts
  • 9. Max starter cable drop: 0.2 volts
  • 10. AGM seals; flooded needs maintenance
  • 11. CAN bus: two wires, high-speed
  • 12. Body Electrical: 34%, largest area
  • 13. Retake wait: 30 full days

ASE A6

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