16_Electrical Diagnostics Strategies

When using an ohm meter on a vehicle's ground circuits make sure __________*

the meter is connected in series
the meter is at least a 10 M ohm meter
the vehicle's battery is disconnected or ALL the electrical loads are off
the ignition switch is turned on and the circuit is live

When a meter shows OL it means the meter is being damaged.*

True
False

Common meter measurement abbreviations are:

M for Mega, K for Kilo, and m for Milli
M for milli, K for Kelvin, m for Mega
M for Mega, K for Kilo, and m for Million
M for Mega, K for Kilo, and m for Micron

Technician A says a replacement battery should have the same or higher CCA rating as the original battery. Technician B says a battery's group size depends on the CCA rating of the battery and its post configuration. Who is right?

Technician A only
Technician B only
Both Technician A and B
Neither Technician A nor B

What is the function of the diodes (rectifier assembly) in an alternator?

Regulate electrical system voltage
Regulate charging voltage
Convert Alternating Current (AC) to Direct Current (DC)
Convert Direct Current (DC) to Alternating Current (AC)

What does OL mean on your DVOM?

Open circuit
No Continuity
Out of limits
All of the above

A meter showing 0.50 when set to read K-ohms, this reading is actually___.

0.5 ohms
50 ohms
500 ohms
5000 ohms

Technician A states that the CAN system uses two terminating resistors at the end of the circuit. Technician B states two 120 ohm resistors in parallel are used as the termination point. Who's correct?

Technician A only
Technician B only
Both Technician A and B
Neither Technician A nor B

When testing continuity of a circuit:

the circuit must be live
the circuit must be off
the meter leads are in series with the circuit
the readings will be in millivolts

To test for current flow in a circuit Technician A says to test with a current probe to check the circuit. Technician B states you can use the Multimeter by connecting it parallel to the circuit. Which is correct?

Technician A only
Technician B only
Both Technician A and B
Neither Technician A nor B

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Electrical Diagnostics Strategies – 16 Hours

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