I wondered if someone may know the specifications of the ignition coil, fitted to my 1.3 MPI Felicia.

The coil is a Champion, which is formed in a type of rail, containing two coils.

I wanted the ohm values, as mine seem way off, to what I would expect. I work on motorcycles, so I have some understanding of what should be happening.

I am only getting a 9 volt supply to the red wire, should it be battery voltage? The resistance I measured between the red and signal terminals, seems very high. 

Regards Paul.

2 hours ago, hog-man80 said:

I am only getting a 9 volt supply to the red wire, should it be battery voltage?

Yes. See schematic.

Edited 25 April, 20197 yr by RicardoM

Does the coil pack contain a booster to step up the voltage to the coils? 

I assumed the coils were fired by the ecu, grounding the coils to create the spark.

The secondary voltage was close to 9.5 k ohms.

The primary was close to 1.5 k ohms, which would suggest something between the secondary windings, or a bad connection. 

Paul.

9 hours ago, hog-man80 said:

Does the coil pack contain a booster to step up the voltage to the coils?  

Everything inside the coil pack is on the hand drawn schematic.

9 hours ago, hog-man80 said:

I assumed the coils were fired by the ecu, grounding the coils to create the spark.

They do.

11 hours ago, hog-man80 said:

Does the coil pack contain a booster to step up the voltage to the coils? 

Er, you generally have one of a coil and distributor, a pair of double-ended coils timed off the (inlet for a dual cam engine) camshaft, or separate coilpacks for each spark plug. In all 3 cases, the function of the coil is to act as a voltage step up transformer from the nominal 12v of the car electrics to the 10_000v or more that is delivered to the spark plugs.

 

Ricardo, please note this is a short general description of normal arrangements for pretty much anything except dual spark engines (not applicable to Skoda), and I'd only use "coilpack" in a 1 pack per cylinder context.

@hog-man80

I'm not sure what you think a "booster" is. In our case there are 2 high power transistors that act as commutators of high current at 12V having each one a coil as load.

On 25/04/2019 at 23:00, hog-man80 said:

 

I assumed the coils were fired by the ecu, grounding the coils to create the spark.

 

Maybe I am being pedantic but the spark is created by the collapse of the field in the primary windings by open circuiting the ground, as in opening of the points in an old fashioned Kettering ignition system.

 

So the voltage that you are measuring is probably with the coils in circuit and the volt drop would be expected.