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electrical charging and cranking > cranking system controll circuits > Flashcards

cranking system controll circuits Flashcards

1
Q

cranking system control circuit allows the driver to use a

A

small current to control a large current flow to the cranking motor

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2
Q

the two main electromagnetic control switches in the starting system are

A

solenoid

mag switch

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3
Q

what makes a diagram easy to read in a schematic

A

when it has been broken out

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4
Q

when the ignition switch or start button are turned on it will send current to

A

the magnetic switch

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5
Q

when the mag switch is activated it will

A

closes its contacts and send signal current to the solenoid

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6
Q

what dose a solenoid on the starter do

A

moves the drive mechanism into mesh with the ring gear and closes contacts that will send current to the field windings

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7
Q

after the field windings have been energized by the solenoid

A

current then flows to the armature windings that will then drive the armature and drive mechanism starting the engine

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8
Q

what are connected in series with the mag switch circuit to protect the starter

A

safety switches

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9
Q

what will happen if the transmission is engaged when you try to turn on the starter

A

the starter will be overloaded and overheat very fast

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10
Q

what kind of safety switch is used on automatic and power shift transmissions

A

neutral safety switch

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11
Q

neutral safety switch are

A

normally closed and connected in series with the mag switch control circuit
trans needs to be in neutral to close the contacts allowing current to flow

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12
Q

mounting locations for the neutral safety switch

A

shift linkage
indicator panel
on the transmission

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13
Q

neutral safety switches are normally on what side the the control circuit

A

ground side

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14
Q

units with manual transmissions will use what for a safety switch

A

clutch position safety switch

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15
Q

clutch position safety switches are

A

normally open and are closed by depressing the clutch

are connected in series with mag switch control circuit

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16
Q

what side of the circuit will the ECU be connected into

A

the ground side of the mag switch control circuit

17
Q

what conditions will the ECU monitor to prevent start up

A

potential theft
low oil level
trans in gear
low battery voltage

18
Q

what is used to prevent overheating in the starter motor

A

the overcrank protection thermostat

19
Q

the overcranking thermostat connections are normally

A

closed

overheating will cause the connections to open cutting current flow

20
Q

how long should it take to close the contacts on a overcrank thermostat to return to closed position after over heat

A

1 to 6 min

21
Q

where is the solenoid mounted

A

directly to the starter motor

22
Q

what connects the solenoid to the drive motor

A

the shift lever

23
Q

what two contacts are connected by the contact disc in the solenoid to allow the armature to start rotation

A

the battery terminal and the motor terminal

24
Q

what is used to prevent the contact disc terminal damage when it is engaged

A

a cushion spring

25
Q

what are the two types of windings in a solenoid

A

pull in

hold in

26
Q

how is a electrical coil measured for strength

A

in amperturns

27
Q

how are amperturns calculated

A

by multiplying amps by the number of turns in a winding

28
Q

how is the pull in winding grounded

A

through the cranking motor

29
Q

how is the hold in winding grounded

A

through the ground terminal

30
Q

what happens to the starter motor when the ignition key is turned off

A

the starter turns into a generator and current will flow in the opposite direction

31
Q

how is the current generated from the starter motor cancel when it is shut off and flows in the opposite direction

A

when it passes through the hold in and pull in windings in opposite directions and will cancel each other out

32
Q

a mag switch is

A

a mechanical switch that operates electromagnetically

33
Q

what condition is a mag switch normally in

A

normally open held there by a return spring

34
Q

if a mag switch only has one coil connector

A

it will be used for power and the ground is supplied through the mag switch case

35
Q

important thing to remember when replacing mag switchwes

A

that it has the same terminal connections and has the same power/amp rating

36
Q

how should a mag switch be mounted

A

horizontally and 90 degrees to vehicle travel

37
Q

what can happen to the mag switch if it is mounted improperly and it incounters road shock or impact

A

the contacts can close and starter will recive power

electrical charging and cranking (5 decks)

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