ASE4 Engine Electrical Systems 2

Question 1

A parasitic draw test finds 350 mA of current drain with the vehicle in sleep mode. Maximum acceptable is typically:

Accepted Answer

100 mA or less

Answer

Acceptable parasitic draw is generally 50 mA or less for most vehicles; some manufacturers allow up to 100 mA, making 350 mA significantly excessive.

Question 2

To isolate a parasitic draw to a specific circuit, the technician should:

Accepted Answer

Disconnect the battery and check individual fuses with a test light in series

Answer

Placing a test light or ammeter in series with each fuse while monitoring current change allows the technician to isolate the draw to a specific circuit.

Question 3

A CAN (Controller Area Network) bus fault can cause:

Accepted Answer

Multiple unrelated DTCs across various modules simultaneously

Answer

Since many modules communicate over the CAN bus, a bus fault can produce numerous DTCs across multiple unrelated systems at once.

Question 4

An alternator with an open diode will produce:

Accepted Answer

Reduced output and AC ripple on the charging circuit

Answer

An open diode reduces alternator output by preventing conversion of part of the AC waveform to DC, and causes measurable AC ripple.

Question 5

Battery sulfation typically occurs when a battery is:

Accepted Answer

Left discharged for extended periods

Answer

Sulfation occurs when lead sulfate crystals harden on the battery plates during prolonged discharge, reducing the battery's capacity permanently.

ASE4 - ASE Automobile Engine Performance Practice Test

ASE4 - ASE Automobile Engine Performance Practice Test

ASE4 Engine Electrical Systems 2