cranking system controll circuits

Question 1

cranking system control circuit allows the driver to use a

Answer 1

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

Question 2

the two main electromagnetic control switches in the starting system are

Answer 2

solenoid

mag switch

Question 3

what makes a diagram easy to read in a schematic

Answer 3

when it has been broken out

Question 4

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

Answer 4

the magnetic switch

Question 5

when the mag switch is activated it will

Answer 5

closes its contacts and send signal current to the solenoid

Question 6

what dose a solenoid on the starter do

Answer 6

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

Question 7

after the field windings have been energized by the solenoid

Answer 7

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

Question 8

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

Answer 8

safety switches

Question 9

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

Answer 9

the starter will be overloaded and overheat very fast

Question 10

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

Answer 10

neutral safety switch

Question 11

neutral safety switch are

Answer 11

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

Question 12

mounting locations for the neutral safety switch

Answer 12

shift linkage
indicator panel
on the transmission

Question 13

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

Answer 13

ground side

Question 14

units with manual transmissions will use what for a safety switch

Answer 14

clutch position safety switch

Question 15

clutch position safety switches are

Answer 15

normally open and are closed by depressing the clutch

are connected in series with mag switch control circuit

Question 16

what side of the circuit will the ECU be connected into

Answer 16

the ground side of the mag switch control circuit

Question 17

what conditions will the ECU monitor to prevent start up

Answer 17

potential theft
low oil level
trans in gear
low battery voltage

Question 18

what is used to prevent overheating in the starter motor

Answer 18

the overcrank protection thermostat

Question 19

the overcranking thermostat connections are normally

Answer 19

closed

overheating will cause the connections to open cutting current flow

Question 20

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

Answer 20

1 to 6 min

Question 21

where is the solenoid mounted

Answer 21

directly to the starter motor

Question 22

what connects the solenoid to the drive motor

Answer 22

the shift lever

Question 23

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

Answer 23

the battery terminal and the motor terminal

Question 24

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

Answer 24

a cushion spring

Question 25

what are the two types of windings in a solenoid

Answer 25

pull in | hold in

Question 26

how is a electrical coil measured for strength

Answer 26

in amperturns

Question 27

how are amperturns calculated

Answer 27

by multiplying amps by the number of turns in a winding

Question 28

how is the pull in winding grounded

Answer 28

through the cranking motor

Question 29

how is the hold in winding grounded

Answer 29

through the ground terminal

Question 30

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

Answer 30

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

Question 31

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

Answer 31

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

Question 32

a mag switch is

Answer 32

a mechanical switch that operates electromagnetically

Question 33

what condition is a mag switch normally in

Answer 33

normally open held there by a return spring

Question 34

if a mag switch only has one coil connector

Answer 34

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

Question 35

important thing to remember when replacing mag switchwes

Answer 35

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

Question 36

how should a mag switch be mounted

Answer 36

horizontally and 90 degrees to vehicle travel

Question 37

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

Answer 37

the contacts can close and starter will recive power