Reference library
Resources
Field guides, symbol keys, and spec cards organized by ASE area. Print them, tape them to the toolbox, pull them up between jobs.
Express Technician
Entry → G1 Prep
E1 · Shop-Ready
Tool Identification Card
Visual catalog of essential hand + power tools. Names, sizes, when to reach for which.
Open reference →
E1 · Spec sheetFluid Service Spec Sheet
Oil grades, coolant ratings, ATF compatibility, brake fluid DOT types. Never-mix rules.
Open reference →
E1 · ChecklistMulti-Point Inspection Checklist
The standard 30+ point sheet with pass/fail criteria. Red/yellow/green decision rules.
Open checklist →
E1 · SafetyShop Safety Quick Reference
PPE, lift points, lockout, hazmat handling. The things that keep you whole.
Open reference →
E2 · G1 Exam-Ready
G1 Exam Content Map & Weights
Full ASE G1 breakdown with content weights and a study schedule tied to E1+E2 modules.
Open map →
E2 · ProcedurePDI Procedure Reference
Pre-delivery inspection workflow with sign-off checklist. Used vehicle / new prep.
Open reference →
E2 · CommAdvisor Handoff Reference
Write-up phrasing, recommendation language, how to document findings the advisor can sell.
Open reference →
E2 · DecoderSymptom-to-System Decoder
Customer-said vs root-system-likely. Translate complaint language into diagnostic targets.
Open decoder →
A1
Engine Repair
Compression Quick Reference
Per-cylinder targets, ring/valve diagnosis, spec deviation thresholds.
Open reference →
Photo libraryBearing Failure Library
Common rod and main bearing wear patterns with root-cause notes.
Open library →
ReferenceEngine Noise ID Card
Sound-to-cause map: knock, tick, rattle, whine, hiss. RPM correlation + the confirm test.
Open card →
Spec referenceOil Pressure & Viscosity
Operating ranges, viscosity-grade decode, low-pressure diagnostic flow.
Open reference →
A2
Automatic Transmission
Pressure Test Reference
Line, governor, and main pressures by gear/condition. What "low" means by symptom.
Open reference →
DTC mapA2 DTC Family Map
P07xx code families decoded with most-seen subsystems and starter diagnostic tests.
Open map →
ReferenceATF Fluid Diagnosis
Color, smell, contamination — what the dipstick tells you before you drop the pan.
Open reference →
ReferenceSolenoid Function & Test
Shift / EPC / TCC / PCS — function table, resistance specs, and test procedures.
Open reference →
A3
Manual Drive Train & Axles
Clutch Slip Diagnosis Chart
Test inputs that prove clutch slip. Worn material vs hydraulic vs adjustment.
Open chart →
ReferenceDriveline Vibration Reference
RPM vs vehicle speed buzz logic. U-joint angles, shaft balance, carrier bearing tells.
Open reference →
Pattern libraryDifferential Gear Pattern Library
Six contact patterns — ideal, heel, toe, high, low, diagonal — with adjustment guidance.
Open library →
ReferenceU-Joint & CV Joint Reference
Inspection specs, failure signatures, working angles, replacement criteria.
Open reference →
A4
Suspension & Steering
Alignment Spec Decode
Camber, caster, toe, SAI — what each does, spec direction, driving complaint mapping.
Open reference →
Photo libraryTire Wear Pattern Library
SVG-drawn wear patterns with cause and fix. Read the wear before replacing tires.
Open library →
ReferenceBall Joint & Tie Rod Reference
Wear measurement specs, dry-park test procedure, replacement triggers.
Open reference →
ReferencePower Steering Diagnostic
Hydraulic, electric, hybrid — pressure specs, EPS scan flow, fluid condition.
Open reference →
A5
Brakes
Pad Wear Decision Tree
Seven pad wear patterns with root cause and the fix beyond just replacing pads.
Open tree →
Symbol keyA5 Brake Symbol Key
Every brake, ABS, traction, stability symbol + the C-code DTC families they map to.
Open key →
ReferenceBrake Hose Inspection Guide
Rubber vs braided, collapse signs, swelling, abrasion zones — when to condemn.
Open guide →
Service cardABS Bleed Procedure Card
Scan-tool automated bleed sequences for 6 major platforms with OEM gotchas.
Open card →
A6
Electrical / Electronic Systems
A6 Circuit Key
Symbols, signals, and diagnostic logic. Power, grounds, sensors, networks, fault terms, HV/EV.
Open key →
FlashcardsA6 Symbol Flashcards
Symbol → meaning drill pulled from the A6 Circuit Key. Schematic literacy starts here.
Start drill →
Spec cardVoltage Drop Spec Card
Max acceptable drops by circuit type — cables, switches, relays, grounds, connectors.
Open card →
Spec referenceBattery & Charging Reference
SOC chart, load-test specs by temperature, cranking voltage, charging spec, flooded vs AGM.
Open reference →
A7
Heating & Air Conditioning
Refrigerant Comparison
R-134a vs R-1234yf vs R-744 — application, service requirements, charge weights, never-mix rules.
Open reference →
Pattern libraryA/C Pressure Patterns
Manifold readings by fault — overcharge, undercharge, restriction, air-in-system, weak compressor.
Open library →
Service cardService Procedure Card
3-phase recovery / evac / charge with pass criteria and platform charge-weight table.
Open card →
Sensor mapClimate Sensor Map
Every ATC sensor — role, normal value, failure footprint, location. Cross-check cheat sheet.
Open map →
A8
Engine Performance
Drivability Quick Key
Sensor signal ranges, fuel-trim reading, mode $06 walkthrough. The PIDs you should know cold.
Open key →
Pattern libraryScope Pattern Library
Curated waveforms — O2, injector, ignition, CKP/CMP. Healthy / marginal / failed side by side.
Open library →
ReferenceMode $06 Reference
MID/TID decoder for catalyst efficiency, O2 sensors, EVAP, EGR flow, and misfire monitors.
Open reference →
DecoderMisfire Pattern Decoder
Single vs multi-cyl patterns, fuel-trim cross-ref, swap test protocol.
Open decoder →
A9
Light Vehicle Diesel Engines
Injection Fundamentals
High-pressure common rail vs HEUI vs unit pump. Pressures, timing, control logic.
Open reference →
ReferenceAftertreatment Reference
DPF, SCR, DOC explained. Regen modes, DEF chemistry, common emissions DTCs.
Open reference →
ReferenceDEF / SCR Reference
DEF fluid spec, SCR system layout, sensor PIDs, NOx norms, failure-mode decoder.
Open reference →
DecoderDiesel Fuel Quality Decoder
ULSD #2 spec, sample color decoder, water/biodiesel/gasoline/gelling cases.
Open decoder →
Drill mode
Flashcards & Quick Drills
Building next
Brake Hose Inspection Guide
Rubber vs braided, internal collapse signs, swelling, abrasion zones — when to condemn.
ABS Bleed Procedure Card
Scan-tool automated bleed sequences for the most-seen platforms. Sequence + OEM gotchas.
Mode $06 Deep Dive
OBD-II Mode $06 monitor data decoded by test ID. Find pending failures before they trigger a CEL.
More resources added weekly. Ping your shop manager with what you want next.