WIRING UP IGNITION SYSTEMS

Warning: Ignition coils create high voltage. It can be dangerous, so avoid getting

too close to ignition parts when engine is running. Make your connections when the

engine is off, and then keep your distance when the engine is running. Even some

primary voltage is high enough to stop a “Pacemaker”.

Warning #2: Don’t ground a coil for more than a few milliseconds or more than 50%

duty cycle. You can overheat the transistor or melt the inside of the coil. They will go bad!

Have a coil and spark plug in the circuit so the spark plug can fire

Check with your tutor that you have done it correctly

.
C = Coil [connect to coil negative side]                                                                               

EXT = connect into negative post of power supply [ earth ]

B  =  connect to positive post of power supply [+ side ]

T  = connect to red wire from function generator

F  =  Feedback [ leave it free ]

Draw a wiring diagram of how you wired the circuit

Wire up an ignition module using a distributor to trigger the module.

Have a coil and spark plug in the circuit so the spark plug can fire

Check with your tutor that you have done it correctly
 

 Draw a wiring diagram of how you wired the circuit

Wire up the wasted spark ignition system using the function generator to trigger the

modules.

Have the coils and sparks plug in the circuit so the spark plugs can fire.

Check with your tutor that you have done it correctly.




Draw a wiring diagram of how you wired the circuit.

TESTING IGNITION COIL

Testing ignition coils

MethodBN    
1 Obtain two different ignition coil configurations.
2 List all coil part numbers, voltage, internal resistance specifications where shown.






Coil Specifications
Coil# 1 No ............................................ Coil #2 No .........................................
Coil# 1 Voltage .................................... Coil# 2 Voltage ..................................
Coil #1 Primary .................................... Coil #2 Primary ..................................
Coil# 1 Secondary ............................... Coil #2 Secondary .............................

Coil Test Results
Coil #1 Primary .................................... Serviceable?
Coil #1 Secondary ...............................
Coil #1 Earth leakage test ....................
Coil #2Primary ..................................... Serviceable?
Coil #2 Secondary ...............................
Coil #2 Earth leakage test ....................

Wasted Spark Coil Pack
Note: That if the coil you are testing is off a four cylinder engine you will only can check
two secondary windings, also if the ignition module is incorporated within the coil you will
not be able to test the primary windings
Coil #1 Secondary ............................... Serviceable?
Coil #2 Secondary ...............................
Coil #3 Secondary ...............................
Coil #1 Primary ....................................
Coil #2 Primary ....................................
Coil #3 Primary ....................................

Testing Ballast resistors
1 Obtain 2 ballast resistors with different part numbers
2. List part numbers and resistance specification(s)
3. Measure the resistance of the resistors
Specifications

Ballast resistor 1 No.......................... Ballast resistor 2 No .......................
Ballast resistor No 1 ohm spec ......... Ballast resistor No 2 ohm spec .......

Measured Resistance Values
Ballast resistor No1 measured ohms .............. Serviceable?
Ballast resistor No 2 measured ohms ............. Serviceable

Measuring Current Draw and Voltage Drop
Standard Single tower coil
1. Wire up a ballast resistor in series with your coil primary winding values as shown in
the following diagram.
2. Connect an ammeter in series and note the current draw.
3. Measure and note the voltage drop across the ballast resistor.
4. Measure and note the voltage drop across the coil primary.

Current draw ...............................................................
Coil calculated Voltage Drop ........................................
Coil measured Voltage Drop ........................................

Ballast resistor calculated voltage drop........................
Ballast resistor measured voltage drop ........................

Did your calculated values equal your measured results explain why or why not?
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INJECTOR TESTING

Checking Injectors off a Vehicle

Injector electrical tests.

Injector number.	1	2	3	4
Manufacturers specification
Winding resistance	14.2  ohms	14.2  ohms	14.2  ohms	14.2  ohms
Earth leakage test

Now wire up your injectors to a power supply and listen to see if they click.

 checking injector for audible "click"

Injector number	1	2	3	4
Injector operation Audible.	ok	ok	ok	ok

State any other engine problems that could give the same result as an injector not firing.
The engine run roughly . The engine is not running cause no patrol goiing into the engine.
Test bench cleaningCleaning Injectors off a vehicle
Cleaning Injectors off a vehicle
When removing fuel injectors from the engine take care to:
relieve the pressure in the fuel system..

What are the manufacturer’s specifications in relation to:
Injector leakage. ............................Drips per minute.
Injector flow rate ............................cc. per minute flow rate

 Test results.

Ignition number                                1                  2                  3                4

Spray pattern	ok		ok		ok		ok
Flow rate.	ok		ok		ok		ok
Injector  leakage.(dribble)	ok		ok		ok		ok

How many injectors require attention? ..
NONE

Analysing your results
Describe the condition of all the injectors that you tested.
When checking all these injector  they are all ok. when  I check the click and they all click thats mean to me its working good it can on and off.I check the spray pattern and its look ok to me because they all spray like a cone shapes.I know that these injectors are all serviceble and they are in good condition.

Sensors

Sensors
Note: the term TPS can mean either throttle position sensor or throttle position
switch
Throttle Position Sensor (potentiometer)
Potentiometer type sensors are composed of variable resistors that have a slide contact,
which changes its position as the throttle butterfly moves.
A voltage is supplied to the sensor by the E.C.U. As the throttle position changes, the
output voltage from the sensor changes, this in turn is recognised and a comparison made
by the E.C.U to its memory. These sensors are adjusted by loosening the sensor mounting
screws. (It is critical that you follow the manufacturer’s set-up procedure)
For example:
The idle position is recognised by the lowest voltage reading through the sensor but in
contrast, the maximum power signal is recognised by the highest reading at the full throttle
position of the sensor travel. It is important that both signals are correct

Checking the Throttle Position Sensor

What type of TPS is this?
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Explain its internal operation and why your voltage changes
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Now connect a Power Supply to your sensor and test the voltage output at different throttle
angles.
NOTE: Always use a 5V supply

Throttle angle	Voltage output

 Now plot your findings on a graph





Throttle Position Switch
There is an idle position signal that is used mainly for fuel cut-off control and ignition timing
corrections. The power signal is created at full throttle and is used for increasing fuel
injection volume which in turn increases engine power output. Note there is no switching at
part throttle.

Throttle position switch detects throttle position at idle or full throttle by using switch
contacts that are connected or disconnected as throttle position changes.
This type of switch can have two or three contact positions and is usually checked and
adjusted using a multi-meter.
Adjustment is made by loosening the mounting screws and rotating the switch assembly.
On - Off type throttle position switches can have:
Two position (three pin) or
Three position (four pin).



Note: PSW means power switch (WOT)
IDL means idle circuit
E means earth
Plot your findings on the graph

Explain the internal operation of this sensor and why the resistance changes
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