Injector test
Note:The electronic fuel injector is no more than an electromagnet that lifts an armature connected to a nozzle and allows high pressure fuel to spray out into the inlet manifold in a fine atomised mist. Injectors from systems that use dropping resistors in the power feed to the injector can be identified from those that do not by their resistance value.
This picture show the injector at duty cycle as it pulse open and closed. As the injector open the switch On, and closed when it turn Off. This information is used to determine the injectors operation. Looking at On and Off time, and measure the voltage
Common values:
With resistor 1.5 - 3.0
(Or with current control built into the E.C.U.)
Without resistor: 14.0 - 17.0
Practical task sheet
Checking Injectors off a Vehicle
| Injector | 1 | 2 | 3 | 4 |
| Manufacturers specification Ohms | 13.8 Ohms | 13.8 Ohms | 13.8 Ohms | 13.8 Ohms |
| Winding resistance Ohms | 11Ohms | 9Ohms | 12Ohms | 9Ohms |
| Earth leakage test | Y | Y | Y | Y |
Click Injector test
| Injector No: | 1 | 2 | 3 | 4 |
| Injector operation Audible. Yes / No | Yes | Yes | Yes | Yes |
State any other engine problems that could give the same result as an injector not firing.
It will cause driveability problems like stumble, hesitation, backfire and surging.
Practical task sheet
Cleaning Injectors off a vehicle
When removing fuel injectors from the engine take care to:
Do not create sparks near fuel injectors and graduated cylinder. Keep fire extinguisher nearby in case something could go wrong.
| Injector No: | 1 | 2 | 3 | 4 |
| condition | yes | yes | yes | yes |
| Ppray pattern | yes | yes | yes | yes |
| Flow rate | yes | yes | yes | yes |
| Leakage (dribble) | yes | yes | yes | yes |
How many injectors require attention?
Non
Describe the condition of all the injectors that you tested.
At any faults components at this point, is to ensure all the fuel-injectors meet the specification standard and shown all the injectors test results are in good condition.These can identify by visual inspection and their bench test showing for any poor spray of any kind. Beside allthe injectors are clean and work perfectly.
Testing ignition Coils Method
Coil Specifications
Coil# 1 No IC-13 Coil #2 No C6R 500
Coil# 1 Voltage12volts Coil# 2 Voltage12volts
Coil #1 Primary 1.5 – 1.6ohms Coil #2 Primary6.5 – 8.5ohms
Coil# 1 Secondary6.0 – 7.0k ohms Coil #2 Secondary6.5 – 8.5k ohms
Coil Test Results
Coil #1 Primary 000.3ohms
Non Serviceable
Coil #1 Secondary06.8k ohms
Serviceable
Coil #1 Earth leakage test 0.00
Serviceable
Coil #2Primary 001.9ohms
Non Serviceable
Coil #2 Secondary08.05k ohms
Serviceable
Coil #2 Earth leakage test0.00
Wasted Spark Coil Pack
Coil #1 Secondary 07.02k ohms
Coil #2 Secondary 07.02k ohms
Coil #1 Primary 0.9ohms
Coil #2 Primary 0.9ohms
Testing Ballast resistors
Specifications
Ballast resistor 1 NoBR1
Ballast resistor No 1 ohm spec 0.9 – 1.6ohms
Ballast resistor No 2 ohm spec 1.5 – 1.7ohms
Ballast resistor 2 No BR3
Measured Resistance Values
Ballast resistor No1 measured 001.9ohms
Not serviceable
Ballast resistor No 2 measured ohms 1.7ohms
Serviceable
COIL
This is the Primary IC-13 and the spec of 1.5 to 1.6ohms also the current draw of 5.55amps from the measurements.
Calculation
V = (I, R)
V = 5.55 x 1.6
V = 3.33v
Current draw 5.55amps
Coil calculated Voltage Drop 3.33v
Coil measured Voltage Drop 0.251v
BALLAST RESISTER
Calculation
V = (I,R)
V = 5.6 x 1.7
V = 9.52v
Ballast resistor calculated voltage drop 9.52v
Ballast resistor measured voltage drop 10.93v
Did your calculated values equal your measured results explain why or why not?
The Ballast resistor reading and calculation match the specification but the coil did not meet the spec.
IGNITION 1(Function Generator)
This picture show the spark firing using the voltage generator, as the switch turn slightly adjust it's volume, current flow from the primary winding of the ignition coil via the igniter to earth. This create a magnetic field which surrounds the secondary winding of the ignition coil. As the primary current ceases, the magnetic field collapses rapidly through the secondary winding and generates a high voltage which is available to the spark plug through high tension leads.
In this wiring diagram shows 12volt supply connect to the positive of the ignition coil and from the negative to the igniter to earth trigger.
IGNITION 2 (Distributor)
This wiring diagram is trigger by the distributor. To work the spark plug the distributor is igniting by turning the motor manually and with the contact breaker close, this allow current to the primary winding of the coil creates high voltage. when the magnetic field collapes in the secondary spark is create.
The distributor trigger type has a dwell angle this is the time length which the power transistor is turn on attach to the rotor teeth’s relate to the contact point and trigger spark plugs.
IGNITION 3 (Using Wasted Spark)
Draw a wiring diagram of how you wired the circuit.
This diagram shows the waste spark distributor. Each coil is connected in series between spark plugs. The ignition is carried out twice at each coil and both spark plugs firing simultaneously. There are two separate series circuits in this type. Here I’m using two spark plugs in two separate circuits.
IGNITION 4 (Coil Over Sparks Plug)
Draw a wiring diagram of how you wired the circuit
In this diagram we used a coil over ignition spark type. The circuit diagram indicate the coil is build up inside the unit and with no high tension lead used.
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