Advanced
General guidance
Use fuel trim data at idle and at speed to decide whether the unmetered air or the missing fuel is the cause, then confirm the repair with trims back...
Structured repair knowledge base
Repair Procedures Library
Search a symptom, a fault code, a system or a vehicle and follow a reviewed procedure from diagnosis to a verified repair.
- Diagnosis-to-repair workflows
- Every value shows its source and verification tier
- Safety warnings before you start
- Categories
- 16
- Systems
- 14
- Levels
- 3
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Featured procedures
A hand-picked starting point for this library.
Intermediate
General guidance
Measure the current the vehicle draws once every module has gone to sleep, then isolate the circuit responsible by pulling fuses and watching the read...
Intermediate
General guidance
Narrow a P0300 random misfire to a single cylinder, a shared ignition component, a fuel delivery problem, an air leak or a mechanical fault — and prov...
Beginner
General guidance
Work through a crank-no-start complaint in the order that removes the most causes per test: battery and cranking voltage, fuel delivery, ignition spar...
Browse by category
View all proceduresGasoline Engine
Procedures covering the gasoline engine of a vehicle. 0 proceduresDiesel Engine
Procedures covering the diesel engine of a vehicle. 0 proceduresFuel Injection
Procedures covering the fuel injection of a vehicle. 1 proceduresIgnition System
Procedures covering the ignition system of a vehicle. 1 proceduresEngine Starting and Charging
Procedures covering the engine starting and charging of a vehicle. 1 proceduresCooling System
Procedures covering the cooling system of a vehicle. 0 proceduresLubrication System
Procedures covering the lubrication system of a vehicle. 0 proceduresTransmission and Clutch
Procedures covering the transmission and clutch of a vehicle. 0 proceduresBraking System
Procedures covering the braking system of a vehicle. 0 proceduresSuspension and Steering
Procedures covering the suspension and steering of a vehicle. 0 proceduresAutomotive Electrical Systems
Procedures covering the automotive electrical systems of a vehicle. 1 proceduresSensors and Actuators
Procedures covering the sensors and actuators of a vehicle. 0 proceduresAir Conditioning
Procedures covering the air conditioning of a vehicle. 0 proceduresExhaust and Emissions
Procedures covering the exhaust and emissions of a vehicle. 0 proceduresHybrid and Electric Vehicle Systems
Procedures covering the hybrid and electric vehicle systems of a vehicle. 0 proceduresBody Electronics and Comfort Systems
Procedures covering the body electronics and comfort systems of a vehicle. 0 proceduresBrowse by automotive system
Engine Management
0 proceduresCharging & Starting
0 proceduresIgnition
0 proceduresFuel Delivery
0 proceduresCooling
0 proceduresLubrication
0 proceduresTransmission
0 proceduresBraking
0 proceduresSteering & Suspension
0 proceduresVehicle Electrical
0 proceduresSensors & Actuators
0 proceduresClimate Control
0 proceduresEmissions & Exhaust
0 proceduresHigh Voltage Systems
0 proceduresChoose your level
Recently published
Freshly reviewed and published.
Advanced
General guidance
Use fuel trim data at idle and at speed to decide whether the unmetered air or the missing fuel is the cause, then confirm the repair with trims back...
Intermediate
General guidance
Measure the current the vehicle draws once every module has gone to sleep, then isolate the circuit responsible by pulling fuses and watching the read...
Intermediate
General guidance
Narrow a P0300 random misfire to a single cylinder, a shared ignition component, a fuel delivery problem, an air leak or a mechanical fault — and prov...
Beginner
General guidance
Work through a crank-no-start complaint in the order that removes the most causes per test: battery and cranking voltage, fuel delivery, ignition spar...
Most viewed
What other technicians opened most often.
Advanced
General guidance
Use fuel trim data at idle and at speed to decide whether the unmetered air or the missing fuel is the cause, then confirm the repair with trims back...
Intermediate
General guidance
Measure the current the vehicle draws once every module has gone to sleep, then isolate the circuit responsible by pulling fuses and watching the read...
Beginner
General guidance
Work through a crank-no-start complaint in the order that removes the most causes per test: battery and cranking voltage, fuel delivery, ignition spar...
Intermediate
General guidance
Narrow a P0300 random misfire to a single cylinder, a shared ignition component, a fuel delivery problem, an air leak or a mechanical fault — and prov...