Red - 12v
Black - Earth
Blue - signal out
Draw the waveform
Describe the waveform using arrows and A,B,C etc. What is happening at different points?
On the waveform when the optical distributor begins the next on of the four blade on the ( Chopper Plate ) will interrupt the signal in the photo electric shell, switching it off. This switching happens faster as the car is under higher load driving conditions.
Explain the difference between Hall - Effect, optical and inductive signals
Hall - Effect uses a steel chopper plate whereas optical uses infra red diodes and inductive signals with reference mark on the rotational crank pulley
In each of the speed sensor above, how does the degrees turned relate to the degrees of crank shaft rotation?
It is done by the reference mark and graduction on the crank pulley.
Injector Testing
Checking injectors off a vehicle.
Only two injectors were available.
Checking injectors for audible "click"
State any other engine problems that could give the same result as an injector not firing.
- Nozzle could be blocked
- Fuel line could have been cut to an injector.
Cheaning Injectors Off a Vehicle
When removing fuel injectors from the engine take care to be sure that the vehicle is turned off and handle the nozzle with care to avoid any damage.
What are the manufacturer's specifications in relation to :
Injector leakage: no drip therfore 0 drips per minute.
Injector Flow Rate: 45cc per minute flow rate
Test Results
How many injectors require attention?
Injector 4
Describe the condition of all the injectors that you tested.
All the injectors were new and working only injector number 4 had a problem with the faulty connection.
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