Ignition Page/COP - VEMS wiki www.vems.hu

IgnitionPage/COP

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]

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.

COIL ON PLUG FK0140 Features:

Integrated coil driver circuit with diagnostics
Fast primary and secondary rise times allow for multiple strike capabilities
Very high weight – energy ratio for maximum performance efficiency
Design provides reduced RFI
Precise electronic timing
Over 150,000 mile durability
Robust electrical connection to the spark plug
Reduced under hood complexity and enhanced engine appearance
Waterproof primary connector
Coated laminations for corrosion resistance
Greater packaging flexibility with reduced assembly costs
Energy adaptable for high demand combustion requirements
Tooling required

Specs:

Output Voltage				Spark Energy
Primary Break Current	Output Voltage		Secondary	Spark Energy @ Vz = 1,000 Volts
	25pF Load	25p-1M Load	Rise Time*	Current	Duration	Energy
6A	28 KV	19 KV	11.2 usec	53 mA	1.0 ms	22 mJ
8A	33 KV	23 KV	10.2 usec	67 mA	1.1 ms	28 mJ
Open Circuit Voltage: 39 KV @ 6 break Amps 44 KV @ 8 break Amps

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.

VAG TFSI coil

Has anyone successfully used these coils?

Bosch "0 986 221 023"
VAG 036905715F
Commonly used on VAG (VW/Audi) TFSI engines (year 2000-2010?).

The pinout is as follows :

Pin 1: ECU Ground
Pin 2: Engine block Ground
Pin 3: 12 volts + (switched)
Pin 4: Signal from ECU

Note :

I've connected pin 1 and 2 to the cylinder head.
The resistance between ground and the signal pin is 370 Ohms.
- not sure how you measure, but maybe it's actually voltage, like an "internal diode clamp" ... eg. you can measure with DVM diode mode (often 400..600mV measured; possibly different in the 2 directions)
The signal is attached to stepper output. I can't get any spark.
- is it possible that the given stepper output is damaged ? Often 270 Ohm limiting series resistor is used when stepper is not used for stepper motor/relay/idle air solenoid, but used only for active coil (to protect stepper chip against accidental shorting to GND or +12V)
- test with DVM ; or a resistor (270 Ohm .. 1 kOhm) and LED that the output works (VemsTune / outputs / Test mode=ON). Needless to say: disconnect the COP while doing this test. The resistor+LED is better than DVM, because even a 2..3 msec pulse can be seen.
The pinout is different from the VAG 115 coils, still same connector - beware!

In response to the above:

I can confirm the Pinout. Car logic seems to be a bit more demanding, than its conventional counterpart.

Applying 5V between Pins 1 and 4 for me lowered the Coil resistance read between 2 and 3 from about 16.000 to 8.000 Ohm with a second external transistor in Darlington Configuration. I used a TIP122 which can drive up to 4 A. I was limited by my usb powersupply though. I assume you would have a larger voltage drop, when applying more current.

With a 250 Ohm resistor you will protect your circuit, through limiting the current to about 20mA. If you dont use it, you might burn your logic. I did the same when driving the sparkplug with an Arduino. Driving it directly gave me a Resistance drop to 13.000 and a super tiny spark after switching off the arduino.

Works well in Darlington Conf with TIP122. Thanks so much for the Pinout!!

Coming next :

I will measure voltage at the signal pin
Stepper output is what I've used so far
Maybe logic level +5V output with 250 Ohm limiting resistor will work better?
- don't know, but shouldn't hurt to try
- however, before trying, doublecheck: measure in the COP connector that both grounds are connected (to each other; and to engine/alternator ground)

VAG FSI Coil

Does anyone have pin out and charge time information? For VAG coils 0 221 604 109 / 06H 905 115

See also

back to IgnitionPage
DummyIgnition