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

500 mA

Answer

50 mA

Answer

200 mA

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

Remove and reinstall the battery repeatedly

Answer

Use a voltmeter across the battery terminals with the car off

Answer

Start the engine and check for AC ripple on the alternator

Question 3

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

Accepted Answer

Multiple unrelated DTCs across various modules simultaneously

Answer

Only the engine to fail to start

Answer

Only fuel injector faults to appear

Answer

Just an inoperative radio

Question 4

An alternator with an open diode will produce:

Accepted Answer

Reduced output and AC ripple on the charging circuit

Answer

Zero charging output

Answer

Overcharging above 15 volts

Answer

Normal output with no noticeable effect

Question 5

Battery sulfation typically occurs when a battery is:

Accepted Answer

Left discharged for extended periods

Answer

Overcharged repeatedly

Answer

Charged too quickly with a fast charger

Answer

Exposed to temperatures below freezing

Question 6

A technician uses an inductive ammeter clamp on the negative battery cable and reads 1.8 amps with the car in sleep mode. The FIRST thing to verify is:

Accepted Answer

That all modules have fully entered sleep mode (wait 20–30 minutes after key-off)

Answer

Whether the alternator has a bad diode

Answer

That the battery is fully charged

Answer

That the test light method is used instead