This page documents several types of coil over plug items.
Subaru
I've got some COPs for a Subaru. Here is an [hi-rez image]
![[hi-rez image]](http://www.kikine.com/nick/cars.jpg){kind=link}
Part number: 22433AA330
Diamond (denso logo; made in Japan) F-645 12V
Use with transistor ignition
9002530 (this is a build or serial number as they are all different)
There are 2 wires on the unit. Yellow and red. Resistance is 0.9 ohms - in both directions (?).
There is infinite resistance between the ground screw and either of the 2 leads. Very likely, this must be a dumb coil.
Can you measure inductance? Apply 0.8 .. 1msec dwell (first, only increase dwell if results justify) (with some sparkgap there) and measure current rampup with scope or DVM (check DummyIgnition):
- Apply a 0.1 Ohm series R (or a calibrated wire) to measure current rampup with scope
- apply a known constant freq and known constant dwell and measure supply consumption with DVM: the max current (and therefore L) can be calculated.
Subaru
Part number: 22433AA421
Diamond FK0140 is used on many Subaru models:
Dwell is said to be 3 ms according to [Link Electrosystems], along with a suppression capacitor. It is a 3-pin design with internal ignitor:
- Coil positive on Pin 1 (with the raised edge)
- Ignitor ground on Pin 2 (in the middle)
- Ignitor positive on Pin 3 (at the clip end)
- Coil ground on mounting bolt.
How best to drive this one?
VAG
The above is active coil, since it has the switching internally.
1J0 973 724 is the 4-pin plug for the VW coil
4D0 906 232 is the 3-pin plug for the VW coil
For passive coils (ment for inductive apps), you can measure appr 0.4 .. 1 Ohm on the primary winding (at least in one polarity, but usually both)
I heard some of these part numbers might be the connector, not the transformer. Double check.
The coil in the 1.8T 20V (1998-2001) is called 058 905 105 (3-pin?).
I think Dave, Jorgen and Sly collected info about many (mainly VAG) TODO: find it in the wiki and move or link. I'm afraid they dumped it (zzz) to some MembersPage (or even irc).
A [A4 schematic] that uses these kind of transformers.
![[A4 schematic]](http://vagner.jeje.je/bilder/albums/album113/AEB_ignition_schematics.jpg){kind=link}
See also
- back to IgnitionPage
- DummyIgnition