ASE A1-A8 Certification Guide 2026: Pass First Try
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When performing a voltage drop test on a ground circuit, the multimeter leads should be connected:
Ase A6 General Electrical Diagnosis
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Pass all 8 ASE exams with proven strategies, study schedules, and requirements for 2026. Step-by-step path to Master Technician status with free practice questions.
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Ohm's Law
General Electrical/Electronic Diagnosis
Flashcard
A vehicle has a parasitic battery drain of 250 mA. The most likely cause is:
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Unit of electrical opposition to current; one of them equals one volt per ampere.
General electrical diagnosis
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Chapter 1: General Electrical Diagnosis
Section 1.1: Ohm's Law and Circuit Principles
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What is the maximum acceptable voltage drop across a single ground connection in a 12V automotive circuit?
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Why must a voltage drop test be performed with the circuit energized and under load?
When using a digital multimeter to test continuity, the circuit should be:
Fault record a vehicle computer sets; a scan tool can clear an ordinary one, but not the permanent version.
An oscilloscope is the preferred diagnostic tool for:
Maximum acceptable voltage drop across a single connector or ground point
A CAN bus system uses termination resistors. In a typical high-speed CAN network, these resistors:
Official term for the dashboard warning drivers call "check engine"; it comes on when the computer finds a problem that could cause excess pollution.
Section 1.2: Wiring Schematics and Diagrams
The normal voltage difference between CAN-H and CAN-L in a recessive state is approximately:
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Term Match
Normal key-off parasitic draw on a modern vehicle
A short-to-ground in a power circuit will typically cause:
Serial data protocol, used under ISO 15765 for OBD communication on every 2008-and-newer diesel up to 14,000 lb GVWR, that carries messages between the vehicle's computers.
When testing for high resistance in a power feed wire, the multimeter should be connected:
Why must a circuit be de-energized before testing resistance or continuity with a DMM?
An open circuit in a power feed to a component will result in:
Handheld tester used to read circuit voltages, voltage drops and current on one display; on it, a 3000-milliamp reading means 3 amps.
Section 1.3: Digital Multimeter (DMM) Operations
A LIN bus system operates at what typical baud rate?
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Term Pairs
When is an oscilloscope the right tool instead of a DMM?
When reading a wiring diagram, a wire labeled "BRN/WHT" indicates:
Sealed lead-acid battery type that holds its electrolyte in a fibrous separator, with no freely moving liquid inside.
Battery and starting
A gateway module in a vehicle network system is used to:
High-speed CAN bus voltage behavior: recessive vs. dominant state
When testing a conventional flooded battery with a digital multimeter, a fully charged battery at rest should read approximately:
Ase A6 Battery Starting System
Lead-acid type built for basic start-stop systems; unlike AGM it does not hold its electrolyte in a glass mat, yet it cycles and accepts charge better than conventional designs.
1.4 Oscilloscope Waveform Analysis
The CCA (Cold Cranking Amps) rating of a battery indicates:
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Total resistance of a high-speed CAN bus with both 120-ohm terminators intact
An AGM (Absorbent Glass Mat) battery differs from a conventional flooded battery in that:
Small gear on the starter drive that meshes with the flywheel ring gear; excessive voltage loss in the solenoid circuit can keep it from engaging.
A vehicle cranks slowly even though the battery tests good at 12.6V and passes a load test. Technician A says high resistance in the starter cables or connections could be the cause and should be checked with a voltage drop test. Technician B says a worn starter motor or excessive engine mechanical drag could be the cause. Who is correct?
LIN bus vs. high-speed CAN bus
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